a visual investigation of the appearance of turbulence in
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Louisiana State UniversityLSU Digital Commons
LSU Historical Dissertations and Theses Graduate School
1951
A Visual Investigation of the Appearance ofTurbulence in Annular Spaces.Thomas Anderson FeazelLouisiana State University and Agricultural & Mechanical College
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Recommended CitationFeazel, Thomas Anderson, "A Visual Investigation of the Appearance of Turbulence in Annular Spaces." (1951). LSU HistoricalDissertations and Theses. 7982.https://digitalcommons.lsu.edu/gradschool_disstheses/7982
A VISUAL INVESTIGATION OF THE APPEARANCE OF TURBULENCE IN ANNULAR SPACES
A D is s e r ta t io n
Su b a i t ta d to th e G raduate Facu lty o f th e L ou isiana S ta te U n iv e rs ity and
A g ric u ltu ra l and Mechanical C ollage in p a r t i a l fu l f i l lm e n t o f th e requirem ents fo r th e degree o f
Doctor o f Philosophy
inThe Department o f Chemical Engineering
fcyThomas Anderson Feaasel
B*8«# L ouisiana Polytechnio In s t i tu te * 19^7 L ouisiana S ta te U niversity* 19^9
June* 1951
UMI Number: DP69360
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LOUISIANA STATE UNIVERSITY LIBRARY
ACKNOWLEDGMENT
The au tho r w ishes to express h is s in c e re a p p re c ia tio n
to Dr* B* S* Preseburgt under whoee d ir e c t io n t h i s work was
c a r r ie d out* fo r h ie advice and guidance* He a leo wishes
to thank Mr* E* E. Snyder whoee mechanioal s k i l l wae respon
s ib le fo r th e e e n s tru e tio n o f th e apparatus*
He wishes to thank Dr* P» M. Horton o f th e Chemical
Engineering Department fo r supplying th e m a te ria l needed
in th ie in v e s tig a t io n and th e s t a f f o f th e Audubon Sugar
Factory fo r making th e space a v a ila b le fo r th e c o n s tru c tio n
o f th e apparatus*
i i
116573
TABLE OF CONTENTS
PAGE
acknowledgment............................................................. 11
LIST OF TABLES 9 . . lv
LIST OF FIG URES............................* ........................ V
ABSTRACT . . • . * v t l
CHAPTER
I INTRODUCTION . . .................................... X
I I THEORY OF FLOW MECHANISMS................... 4
A* C irc u la r Pipe • « * . . . . « « 4
B* Annular flection* 12
O* Conclusions 9 . . * .................. SO
I I I SUMMARY OF EXPERIMENTAL WORK « . * 22
A* Apparatus • • • • « » • « * « 22
B# Experim ental Procedure . * . • 27
0* L im ita tio n s o f Apparatus
and Data » * .................................... 26
D* T es ts o f Data . « • * « » • • * *>1
17 EXPERIMENTAL RESULTS............................
A* G e n e r a l ...................... • * « « * «
B. V elocity Measurements * . . . * 40
C# C r i t ie a l Values * * « » 56
7 CONCLUSIONS AID RECOMMENDATIONS . * 66
i l l
TABLE OF CONTENTS
Continued
APPENDIX
I B1BLIOQBAPHX............................... 69
I I NOMENCLATURE...........................................* . . . 95
I I I BATA * ........................... 95
IT CALIBRATION CURVES .............................. 1X5
V ITA ............................................... 115
i v
LIST OF TABLES
I* C r i t i c a l Reynolds Numbers fo r C irc u la r Pipe* • • 6
II* R e su lts o f In v e s tig a tio n * on Annular Spaces a t
Reported by Wiegand and Bakor • • » * * • • • * IT
I I I* Dimensions o f P ip es Usod in th e Experim ental
wark • * « • • • • * * • • • • • • • * • • • • 26
17* T h e o re tic a l P ro p e r tie s o f th e S ec tions T ested • 40
V-a L ast Observed S tream line Plow C onditions fo r
Annulus No* I * * * * * * * * * * * * * * * * * 59
v-b F i r s t Observed T urbu len t Flow C onditions fo r
Annulus No* l * * * * * * * * * * * * * * * * * 61
V I-a L as t Observed S tream line Flow C onditions fo r
Annulus No* £ • « • • • • • • * * • • • * * • • 65
VI-b F i r s t Observed T urbulen t Flow C onditions fo r
Annulus No* 2 « » • • « • • * » • * 64
V II-a L ast Observed S tream line Flow C onditions fo r
Annulus No* ^ * ........................ * * 6J
V II-b F i r s t Observed T urbulent Flow C onditions fo r
Annulus ^7
VIII* Summary o f C r i t i c a l Reynolds Numbers * * * * * 67
v
LiZST OF FIGURES
1 V isual O bservation Apparatus fu r Flow In Annull * * * 25
£ T ypical Wave Motions Observed « • * . * * * • * » • • J6
3 Pye S epara tion P a t te rn * • * • * * « * • • • • • * • 3®
4 V e lee ity D is tr ib u tio n fo r Annulus Wo• 1 * * • * • • • 4 l
3 V e lee ity D is tr ib u tio n fo r Anm lue No* 2 • » ................42
6 V e lo c ity D is tr ib u tio n fo r Annulus No* 5 * * * . . . * 45
7 V e lo c ity D is tr ib u tio n fo r Annulus N o * 4 « * * * * * * 44
8 R atio o f Average V eloc ity to Maximum V eloc ity in
Annulus No* 1 a s a Funotion o f Reynolds Number • • • 47
9 R atio o f Average V eloo ity to Maximum V e lo c ity in
Annul! No* 2 and 3 ** Functions o f Reynolds Number • 48
10 E ffe c t o f In c re ase in Reynolds Number on P o in t
V e lo o itie s Anm lue No* 1 • * * « « • .................................
11 E ffe e t o f In e rease In Reynolds Number on P o in t
V e lo o itie s in Annulus No. 5 52
12 V e lo c ity G rad ien ts a t Walls as Functions o f
Reynolds Number * * • • • • * • • • * • « 5?
13 von {Carman Reduced V elo c ity D is tr ib u tio n fo r
Annulus No* l * * * * * * * * * * * * * * * * * * * * 55
14 von Kerman Reduced V elo c ity D is tr ib u tio n fo r
Anm lue No. 3 ...................... * • • • • • * ♦ 57
15 C r i t i c a l Average Reynolds Numbers a t P o in ts in
Annulus No* • • • * 69
v i
LIST OF FIGUB&S
Continued
16 C r i t i c a l Average Reynolds Numbers a t P o in ta In
Annulus No* 2 * * * * « . * ♦ * * * • • « . » « . * 70
17 C r i t i c a l Average Reynolds Numbers a t P o in ts in
Annulus No* ^ » 71
16 C r i t i c a l Values o f u / ^ a t P o in ts In Annulus No* 1 74
19 C r i t i c a l Values o f u / 7 a t P o in ts in Annulus No* 2 75
20 C r i t i c a l Values o f u /V a t P o in ts in Annulus No* J 76
21 C r i t i c a l V alues o f u / ^ a t P o in ts in Annull No* 1
•nd 3 * * .................................................................................. 77
22 C r i t i c a l Values o f v j a t P o in ts In Annul! No. 1
and 3 .................................................................... 76
25 C r i t i c a l P o in t Reynolds Number as a Function o f
P o s itio n in Anmlue No* 1 . . • • * * * . . * * # ♦ 60
24 C r i t i c a l P o in t Reynolds Number as a Function o f
P o s itio n in Annulus No* 2 * * * # » * » « . » . . * 61
23 C r i t i c a l P o in t Reynolds Number as a Function o f
P o s itio n in Anmlue No* 3 * ♦ • • * * * • * • • • 62
26 C r i t ic a l Values o f ^ a t P o in ts in Annulus No* 1 65
27 C a lib ra tio n o f Rotameter * • • • « • • * • « * • • 113
26 P o s itio n o f Dye Tubing • • • • * • # . * • * * • • 114
vi l
ABSTRACT
Previous in v e s t ig a to r s have s tu d ied th e mechanism o f
s tre am lin e and tu rb u le n t flow* but no t th e c o n d itio n s under
which th e mechanism changes* This re se a rc h was concerned w ith
t h i s t r a n s i t i o n reg io n in whioh i t i s p o ss ib le to determ ine
what p o r tio n o f th e f lu id I s In s tream lin e and what p o rtio n
i s in tu rb u le n t motion*
Most p revious work has used th e o ire u la r se c tio n ; th e
an m lu e was s e le c te d fo r t e s t s here* avoiding th e symmetry
o f th e e l r o le and g iv ing d is s im ila r eu rfeces fo r f r ic t io n *
Dye in je c t io n tech n iq u es were used to observe th e be*
h av io r o f w ater flowing a t room tem peratu re In th re e annular
sections* formed using a 5- inch o u te r g la s s p ipe and cores
&*# 5/^* and l4* s tandard ga lvan ised iro n pipes* V eloc ity
d is tr ib u tio n s * ob ta ined a t a c o n stan t flow r a t e in ttfe stream
l in e re g io n were compared w ith accep ted th e o r e t ic a l r e la t io n s
and found to agree favorably* ju s t i fy in g th e technique*
V isual o b se rv a tio n o f th e dye behavior as th e mechanism
©hanged from s tream lin e to tu rb u le n t flow* in d ic a te d th a t
t r a n s i t i o n in flow f i r s t m anifested I t s e l f as a slow sinuous
motion in th e flu id * As th e flow r a te increased* th e wave
len g th decreased u n t i l eddying and d if fu s io n re su lte d * In a l l
v i l i
cases tu rb u le n ce was observed f i r s t in th e c e n tra l p o rtio n s o f
th e se c tio n and spread toward th e w a lls w ith in c re a s in g flow
ra te s*
C r i t i c a l flow c o n d itio n s were ob ta ined a t v a rio u s p o in ts
in a c ro s s -e e o tio n o f th e annull* The minimum c r i t i c a l Reynolds
Number, — t wa8 occur a t th e p o in t o f maximum
v e lo c ity fo r two sections* occu rring approxim ately .0 2 -.0 4 in ch es
( th e exac t v a lu e being a fu n c tio n o f th e r a t i o o f d iam eters) to
th e c e re s id e o f th e m id-poin t o f th e annulus* For th e se c tio n
w ith th e core* t h i s p o in t o f minimum va lue was d isp laced ap
proxim ately 0 .2 5 inch toward th e core from th e p o in t o f maximum
v e lo c ity * The c r i t i c a l Reynolds Number a t v a rio u s p o in ts In th e
w idest an m lu e was found to in c re a se from 14^0 a t r 8 0*65 inches
to 55OO a t r 8 1*40 in ch e s3 a minimum o f 11^0 was in d ic a te d a t
r = 1*1*5 * max* 'In BUf one annulus p o in t c r i t i c a l v e lo c i t ie s v a ried w ith
p osition* in c re a s in g sharp ly and con tinuously from minimum v a lu es
a t each wall* Rectangular* lo g arith m ic and sem i-logarithm ic
p lo ts o f th e c r i t i c a l v e lo c ity a g a in s t d is ta n c e from a wall* gave
curved lin es* These curves were concave downward near th e walls*
bu t f l a t in th e middle o f th e section*
A p o in t Reynolds Number* y u / -7/ * y being th e d is ta n c e
from a su rfa ce and u th e p o in t ve lo c ity * was adopted to express
th e c r i t i c a l va lu es a t d i f f e r e n t position© in th e sections* The
i x
fo llow ing re la t io n s h ip s were o b ta in ed *
fo r th e l i* core* ^
and fo r th e cor a , ^0l)er> 'i. ' ^ 7e>Q
These expreBaione were found a p p lic a b le to a l l point© i n th e
a ee tlo n e p ro rlded y wae measured from th e core w all fo r p o in ts
between th a t su rface and r •max*F urther work was recommended to determ ine th e e f f e c t o f
w a ll roughness on th e se conditions*
x
c s m m i
i m m m n m
Rven b e fo re th e tim e of R eynolds' o r ig in a l dye experim ents
In 1883 w ith w ater flow ing in p ip es (2g ) , i t had been known th a t
f lu id s flow ing e x h ib ite d d if f e r e n t behav io r f o r d i f f e r e n t flow
r a t e s , t h i s was evidenced by th e f a c t th a t flow a t low v e lo o i t ie s
in sm all p ip es shoved p ressu re drops which were p ro p o rtio n a l to
th e f i r s t power of th e v e lo c ity * t o r flow a t h igh v e lo o i t ie s in
la r g e p ip e s , th ese p ressu re drops were found to be alm ost pro
p o r t io n a l to the square o f the v e lo c ity * The knowledge of th ese1
f a c t s was th e m o tiv a tio n behind R eynolds' experim ent to determ ine
when th e f lu id m otion would y ie ld th ese d i f f e r e n t r e s u lts *
In h is work Reynolds found , by In je c tin g a dye in to th e f l u id ,
th a t a t low flow r a te s tiie in je c te d dye was c a r r ie d in a s t r a ig h t
l i n e by th e f lu id * T his type o f flow he d esc rib e d a s d irfeet flow ,
b u t i t i s now mere commonly r e f e r r e d to as s tream lin e or lam inar
flow* When th is type o f flow was observed. I t was found th a t th e
p re s su re lo s s doe to f r i c t io n was dependent on the f i r s t power o f
th e v e lo c ity * As th e flow r a t e was in c reased , however, he observed
th a t above c e r ta in c r i t i c a l r a t e s , the dye th rea d was to rn up and
the c o lo r was d isp e rsed throughout the p ip e , f o r th is type o f flow ,
i t was found th a t th e f r i c t i o n lo o s was dependent upon th e v e lo c ity
r a is e d to a power g re a te r than one. By using p ipes o f d i f f e r e n t
1
d iam eter and v a ry in g th e tem pera tu re o f th e w ater flowing*
Beyaolds found th a t th e grouping* » W ^ * • had th e same va lue
f o r th e p o in t o f change in flow behav io r fo r o i l systems te s te d .
T h is grouping has o inco been c a l le d th e Hsynold* Number.
S ince th a t t in e th e Reynold* Slumber hoe Veen w idely need to
o o r r e la te th e b eh av io r o f f lu id s In m otion. I t hoe been found to
bo a convenien t oenoept on which f r i c t i o n drop* h e a t t r a n s f e r and
ness t r a n s f e r s a l e o la t io n s o f system s may be b ased . In a l l such
trea tm en ts t however. th e re a r is e s a c e r ta in range of Reynolds Jfumbers
in which th e behav io r o f the f l u id I s no t c le a r ly d e fin e d . T his
c o n s t i tu te s th e s o -c a l le d t r a n s i t io n reg ion* a reg io n o f change
from flow obeying th e th e o re t ic a l law s of s tre am lin e m otion to
flow obeying the em p irica l r e la t io n s h ip s f o r tu rb u le n t m otion.
The manner in which th is t r a n s i t io n takes p la c e has n o t been
s a t i s f a c to r i l y ex p la in ed . A q u e s tio n vh loh has n o t been s e t t l e d
y e t is* does th e flow change from s tre am lin e to tu rb u le n t through
ou t th e e ro s s -s e o t io n a t the same time* o r does more and more of
th e f l u id e x h ib it tu rb u le n t c h a r a c te r i s t i c s a s th e f lo v r a t e i s
g ra d u a lly increased?
T his re se a rc h i s concerned w ith the t r a n s i t io n reg io n o f flow
and has a s i t s purpose th e d e te rm in a tio n of th e co n d itio n s which
e x i s t when th e f lo v mechanism changes from stream lin e to tu rb u le n t
a t d i f f e r e n t p o in ts In the c ro s s -s e c tio n o f an annu lu s. V isual
* See Appendix I I fo r Nomenclature
5
o b se rv a tio n o f flow behavior i s p a r t ic u la r ly su ite d to thi©
in v e s tig a tio n s by o b se rv a tio n o f a p roperly in troduced dye stream*
th e ex ac t behavior o f th e f lu id flow ing can be observed* In th e
ease o f th e flow o f w ater i t has been found th a t a very d i lu te
s o lu t io n o f a w ater so lu b le dye can be used e ffe c tiv e ly * By t h i s
method i t l a n o t on ly p o ss ib le to observe th e type o f flow e x is tin g
b u t fo r s tream lin e flow i t i s p o ss ib le to o b ta in th e v e lo c ity o f th e
w ater a t th e o b se rv a tio n p o in t and a lso th e maximum v e lo c ity i n th e
section*
In th e flow o f a f lu id p a s t a su rfa ce a t flow r a te s w ell above
th e accepted maximum va lue fo r s tre am lin e flow* P re n d tl 'e boundary
la y e r th eo ry In d ic a te s t h a t th e re i s a s tream lin e su b -lay er o f th e
f lu id near th e su rface ( 52)» b u t i t s th ic k n e ss I s so sm all t h a t
measurement o f I t i s d i f f ic u l t* i f no t im possible* Presuming* how
ever* th a t in th e t r a n s i t io n reg io n th e p o rtio n o f th e flow whloh
e x is ts i n th ie s tream lin e flow I s f in i te * t h i s can be determ ined by
t h i s dye in je c t io n method and perm it such e v a lu a tio n o f th e behavior
as w il l apply eq u a lly w ell to tu rb u le n t flow*
In th e past* in v e s tig a to r s o f flow behavior have used th e
c i r c u la r s e c tio n as th e flow standard* beeause o f th e symmetry o f
t h i s se c tio n end a lso beoaute o f th e wide a p p lic a tio n o f I t in
flow in s ta l la t io n s * The anzaulue i s se lec te d in t h i s work to avoid
th e symmetry o f th e o i r o le and a lso to a ffo rd two d is s im ila r sur
fa c e s fo r f r ic t io n *
CHAPTER XI
THEORY O F FhOW MKGKAHZSIMI
A* C irc u la r P ico*
Since th e middle o f th e seven teen th cen tu ry , when T o r r ic e l l i
s tu d ied flow through an o r i f i c e , th e flow o f flu id® has hold coir-
s id e ra b le i n t e r e s t fo r many e e le n t ie t s ( 2) . I n th e m iddle o f th e
n in e tee n th cen tu ry , Darcy and one o f h ia co-w orkers wore th e f i r s t
to recogn ize th e e x is te n c e o f two flow mechanism, as dem onstrated
by t h e i r experim ents on p re ssu re drop In pipes* However, th e law
fo r viecoue flow had been s ta te d about te n y ea rs e a r l i e r by Hagen
and again by F o le e u l l le , who a lso v e r i f ie d th e law w ith s tu d ie s o f
flew in c a p i l la r ie s * This i s th e fa m ilia r H agenrF o leeu llle equa
t io n fo r c i r c u la r p ip es ,
AF L
T his equation was ob tained fo r th e flow ease In which th e only
fo rc e s which must be considered a re th e v iscous fo rc e s o f one
la y e r e f f lu id s lip p in g p a s t another* I t has been g e n e ra lly ac
cepted th a t a f lu id w il l obey Equation (1 ) fo r v a lu es o f Reynolds
Humber le s s th a n 2100, a lthough t h i s value i s em p irica l and excep
t io n s have been reported* This i s c a lle d th e c r i t i c a l Reynolds
Number and flew fo r any value le e s th an t h i s le com pletely s i r earn-
lin e*
4
( i )
5
tli* fo o t t h a t f lu id s flow ing in s tream lin e motion obey t h i s
th e o r e t i c a l law fo r p re ssu re drop makes p o ss ib le tho trea tm e n t o f
ouch ooooo by sim ple m athem atical procedure* However# i f th o
f l u id flow* in tu rb u le n t motion# th en em pirica l r e la t io n s h ip s have
t o t o ob ta ined *o th a t th o trea tm e n t o f th la **•* may bo c a r r ie d
out* Ono o f th o oar H o s t formula* to bo u**d to compute th o flow
i n o i l * o rt* o f oondOit* wa* th a t o f Ohesy (H)# g iven below*
t t y .
L C a # H (a)Since th o appearance o f th ie form ula, sev era l o th e r expression*
have boon developed* two o f which a re g iven below*
Fanning Equation, — - ( 5)L J j D
Hasea-W illiam s Formula* /-?( f o r w ater on ly ) / * / S / & C r<n \ L / (b )
Avj
The Panning Equation 1* th e moot w idely used o f th e se expressions
and may be expressed in many ways, as*
Af_ _ 4 f G * _ 4 f^ v , 34-fiH1L ' 2 9 d ' ? s D f ' D n y g £ * ( 5 .J
In a f lu id system , th e re fo re , i t I s necessary i s know tho typo
o f flow whioh e x is ts* Although Reynolds' in v e s tig a tio n ind ica ted
t h a t th e type o f flow whleh e x is te d could be determined by th e vain#
o f th e Reynolds Number# i t remained fo r S tanton and Pannell ( 54) ^
6
apply t h i s group to tho oo rro l& tion o f f r l o t i o n lo s se s no measured
by numerous in v e s tig a to rs * They found th o t tho f r i c t i o n f a c to r woo
o unlquo fu n c tio n o f th o Reynolds Number fo r smooth c i r c u la r p ip es
c o n ta in in g a v a r ie ty o f f lu id s* They s to to d th e re fo re t h a t
* s im ila r i ty o f n o tio n i n f lu id s a t eono tan t v a lu es o f th o variab le#
nv # w i l l ex is t# provided th e s u r f uses r e l a t i v e to whleh th o
f lu id s aovo o re g e e m str is a lly s im ila r# whleh s im ila r ity # as herd
R ayleigh has po in ted out# o u s t extend to th o se i r r e g u l a r i t i e s in
th o su rfaoo whleh c o n s t i tu te roughness** from th e p lo t o f th e s e
f r i c t i o n f e s t e r s a g a in s t Reynolds Number* th e c r i t i c a l Reynolds
Number was in d ic a te d to he approxim ately 2100.
Table I g iv es some o f th e v a lu es o f c r i t i c a l Reynolds Numbers
ob ta ined by v a rio u s in v e s t ig a to r s u sin g c i r c u la r pipe*
TABLE I
C r i t i c a l Reynolds Numbers fo r C ircu la r P ipe
In v e s t ig a to r % ^( C r i t i c a l ) Method
S tan ton and P enne ll (24 ) 2100
Page and Tewnend (14) 2000*2700 Motion o f c o llo id a l p a r t ic le s*
F r lo tio n
Bend (7 )
B innie and Bowen ( 6 )
B innle ( 2 )
C lbson ( I d )
Reynolds (29 )
1690-2150
1760
1970
2700-4175
2300
Luminescence
P o la r is e d l i g h t
Color Band
Color Band
Stethoscope
T
I n th e development o f P o iB eu ille* * law fo r th e f r l o t i o n lo o s
i n c i r c u la r pipe* th o p o in t v e lo c ity o f th o f lu id l a ob ta ined as
an l a t e r m odiate fo ra* Thie p o in t v e lo c ity may be expressed as*
A ll o f theoe equations a re a p p lic a b le as long as th e flow through-*
o u t th e p ipe l e e e a p le te ly stream line*
When th e e r i t i e e l v a lu e o f th e Reynold* Humber l e exceeded*
th e r e la t io n s h ip s above no longer apply* S tan ton ($4 ) found th a t
th e value o f th e r a t i o o f average v e lo e ity to th e maximum v e lo c ity
in a re ae ee g ra d u a lly th roughou t th o t r a n s i t io n reg io n and reach es a
v a lu e o f approxim ately 0 .60 a t NR# * 10*000* Above th ie v a lue o f
th e Reynolde number# th e r a t i o ren a ln o approxim ately constant*
Throughout t h i s range th e v e lo e ity d i s t r ib u t io n le changing* bo any
ex p ress io n whleh re p re se n ts th e v e lo e ity d i s t r ib u t io n in t h i s reg io n
o u s t eozxt&ln fu n c tio n s o f th e Reynolds KUmber. Therefore* von
Kerman (55) has developed a u n iv e rsa l v e lo e ity d is tr ib u tio n * assuming#
among e th e r th ings* th a t a lanubtar eub -layer o f f lu id e x is ts* In th i s
(5 )
i s ob ta ined from Equation (1)* then*I f th e v a lu e o f
M )
from whleh*
' / 77<J»X
(7 )
a
ho BBk«» u s* o f a reduced v e lo e ity param tor, u% and a reduced
d le ta n s e y +# f b t l t v a lu e s a re defined act#
!
y * - ju
I n abi«h» Tb » tIboobb *h«ar «tr«B* « (d jy )g „ 0
<6)
(9)
( » >Z
For c ircu la r pipes la which 72 - fpAXg- m j
u * =(12)
* S Ir /2 (15 )
B ring th e s e r»UU oA<» N lk a ra d fi (58) determ ined th a t th o flow in
smooth p i poo oouXd ho d iv ided In to th ro o reg io n s a* follow s*
( 1 ) th o U a l s a t lay e r o f f lu id i n which*
u + * - t / + <1*>
(# ) t t * t r m l U r a ra g io n i n whish
U + = /°?K y + - 3 - a s - ( 15)
and (5 ) th o f u l ly tu rb u le n t flow , fo r which
u >* & 7 S * & Btf*+ ^ (W )
M ille r (29) h a s brought some se rio u s doubt in to th o aoooptanoo o f
th o se va lues as c a lc u la te d by H ikuradse, e sp e c ia l ly fo r th o v a lu es
Which wore in tended to prove th e e x is to n e s o f a lam inar lay e r near
th o surface* However, e lnee th a t tim e, o th e rs have ob tained r e s u l t s
9
whleh agree with the re suite of Nikuredee (IJ)#
Rothfua (2 ? ) used a m odified f r i c t i o n fa c to r p lo t to
c o r r e la te p o in t v e lo c i t i e s I n a c ir c u la r pipe* In th ie p lo t
and i t wee found th a t th e experim ental p o in ts f e l l upon th e
l in e s fo r th e f r l o t i o n f a s t e r p lo t in both th e s tre am lin e and
tu rb u le n t flew region* For th e p o rtio n o f th e f lu id in stream*
t 9 3j5/Nr ^ . The c r i t i c a l v a lu e o f $ y u /V was In d ic a te d to be
approxim ately 1000 f o r * 6# 210 and about 600 fo r
Throughout th e m a te r ia l p resen ted th u s far* freq u en t m ention
i s made o f th e Reynolds dumber a s th e b a s is fo r determ ining th e
flow c h a r a c te r i s t i c s o f a f lu id * M th e o r e t ic a l j u s t i f i c a t i o n
i s p resen ted fo r such use* According to Kllnfeenberg and Mooy (17)
th e Reynolds Humber "se rv es as a measure o f th e r e l a t i v e im portance
o f th e t r a n s f e r o f momentum by convection and by d if fu s io n reaper*
t iv e l y ff i . e .# o f th e fo rc e s o f i n e r t i a i n r e l a t io n to fo rce s on
account o f In te rn a l f r ic t io n * " As such i t re p re se n ts th e q u o tie n t
ob ta ined by d iv id in g one term o f th e Navier**Stokes equations by
one o f th e e th e r terms* Since a l l f lu id s obey th e s e eq u atio n s o f
motion# th en I t i s to be expected th a t suoh a r e la t io n s h ip should
se rv e a s a b a s is fo r flew behavior*
T his I s a ls o shown by Brown ( 6 )* In t h i s in stance# two system s
which a re g eo m e trica lly s im ila r a re considered and by assuming
2 TZfpvP* i s p lo tte d a g a in s t a p o in t Reynolds Number* © yu/y’
l in e motion# %T^Jp u 2 * 16 ^/©yu# which i s analogous to
*Rm s fct#30Q#
dynamic s im i la r i ty i t l a found th a t a Reynolda Number group l a
ob ta ined eueh t h a t th e v a lu e o f i t In one system l e equal to th a t
i n th e o th e r system* The fo llow ing sta tem en t le made*
*— *# when dynamic s im ila r i ty e x is ts i n two system s, th e product o f any c h a r a c te r i s t ic dim ension, any v e lo c ity , th e d e n s ity and th e re e ip ro o a l o f th e v ls e o e l ty i s th e seme fo r both system s when th e se v a r ia b le s a re chosen a t eorresponding lo ca tio n s* T here fo re , th e se v a r ia b le s (L , V, f> # / / ) in them selves w ill determ ine th e flow p a tte rn in
g eo m etrica lly s im ila r systems**
T h ere fo re , th e good c o r re la t io n s ob tained when using Reynolds
Numbers fo r c i r c u la r p ipes o f equal roughness a re to he expected
from t h i s statem ent* Although t h i s Reynolds Number i s u se fu l in
p re d ie tin g th e type o f flow which e x is t s i n th e se c i r c u la r p ip e s ,
i t does no t g iv e any in d ic a tio n o f th e mechanism by which th e
Change from s tre am lin e to tu rb u le n t flow ta k e s p isee*
By a purely m echanical a n a ly s is o f th e f a c to r s which would
a f f e c t th e growth o f a d is tu rb an c e in a flow pa tte rn # Reuse (21)
p re se n ts a so -c a lle d s t a b i l i t y parameter# V ,
-y =
^ (X7)
The v a lu e o f t h i s param eter w il l n e e e e sa r lly be se re a t a boundary
( y * 0 ) and again a t th e p o in t o f maximum v e lo e ity (du/dy s 0)*
T herefo re I t w i l l a t t a i n i t s maximum value a t some p o in t between
th e s e two* B ines a h igh value o f t h i s param eter in d ic a te d in
s t a b i l i t y o f flow , i t fo llow s th a t th e po in t o f g r e a te s t i n s t a b i l i t y
w i l l be a t a p o in t between th e su rfa ee and th e p o in t o f maximum
v e lo e ity } t h i s should be th e p o in t a t which tu rb u len ce w ill f i r s t
XI
occur* Hathen® t io e 1 ly th ie p o in t i s o n e -th ird o f th e ra d iu s
removed from th e se n io r o f a o lro u la r pipe* th e use o f t h i s
param eter does not seem c o rre o t when i t I s considered th a t i t s
v a lu e i s always aero a t th o p o in t o f maximum v e lo c ity * In d io a tr
th a t flow a t th a t p o in t i s very s ta b le to d istu rbance* Also
in aome p relim inary in v e s tig a tio n s by tho author ( 1^)» i t was
In d ica te d th a t tu rb u len ce appears f i r s t a t th e c e n te r o f a
c i r c u la r pipe* House does not p re sen t any experim ental d a ta
to in d ic a te th e r e l i a b i l i t y o f t h i s parameter*
(Jibson (16) i s one o f th e few workers to t r y to determ ine
th e p o in t a t whleh tu rb u le n ce w ill f i r s t appear in a c ir c u la r
pipe* 3y in je c t in g a dye in to w ater flowing in th e p ipe and by
o b se rv a tio n o f th e dye# he d e te r ad nod th a t tu rbu lonoe f i r s t
appeared a t a p o in t approxim ately s ix - te n th s o f th e ra d iu s from
th e c en te r o f th e pipe* He oonoluded th a t t h i s change occurs
f i r s t a t th e p o in t o f maximum change o f k in e t ic energy# whleh
has th e va lue o f 0*2773 f*or s tream lin e flow o f a f lu id in a
c ir c u la r seetlon* T h is again i s no t in agreement w ith th e pro*
▼ions f in d in g s o f th e author*
I t I s in d ic a te d above th a t th e v iscous ahear s t r e s s in a
th e in te g ra t io n o f t h i s s t r e s s over th e e n t i r e area o f flow y ie ld s
th e p ressu re drop due to th e f r ic t io n * However* when th e flow
becomes tu rb u len t* t h i s v iscous s t r e s s i s no t th e only c o n tr ib u to r
to th e f r i c t io n a l lo sses* Since th e flow o f th e f lu id pa rtic le®
f lu id may be expressed as and* fo r s tream lin e flow*
12
In tu rb u le n t flow has boon found to b© eddying and in d ire c t#
th « v e lo c ity a t a p o in t i© not oonetan t w ith time* Therefore#
a tem poral mean v e lo c ity # tf# must be used* I t i e a lso neoes-
aary to in d io a to th e e f f e c t iv e shear s t r o t s as#
In th is# rj i s o a lled th e eddy v iso o a ity and has been defined
by PrandtX ( 52) as#
In Equation (19) \ I s known as th e mixing len g th and s ig n i f ie s
th e d ie tsn o e in th e t ra n s v e rse d ir e c t io n which a f lu id p a r t i c le
a s s t t r a v e l s t th e mean v e lo c ity o f i t s o r ig in a l la y e r so t h a t
th e d if fe re n c e between i t s v e lo c ity end th e v e lo c ity o f th e new
lo c a tio n eq u a ls th e mean v e lo c ity f lu c tu a t io n o f th e tu rb u le n t
flow* I f v e lo c ity d is t r ib u t io n s and p ressu re drop measurements
a re made# i t ie p o ss ib le to c a lc u la te th e d is t r ib u t io n o f t h i s
mixing leng th in th e flow section*
B* Annular S ec tio n s*
The c o n s id e ra tio n s above have d e a l t alm ost e x c lu siv e ly w ith
c ir c u la r sections* Binoe flow in th e se flections her been more
thoroughly in v e s tig a te d th en th a t in any o f th e o th e r shapes*
This ia understandable* s in ce c ir c u la r p ipes a re th e most w idely
used flow seotienfl* Another widely used flow se c tio n ie th e
(18)
(19)
15
animlua* For etre&m line flow in a co n cen tric annulus, tho
p re ssu re drop may be calcu lated . by a m o d ifica tio n o f P o ise u ill© 1©
law fo r c i r c u la r pipes* Thin y ie ld s , (S I )
( 20)
The ra d iu s o f th o p o in t o f maximum v e lo c ity fo r t h i s type o f flow
in an annulus i s g iven by th e expression#
V - J 7 ^
( 21)
T his po in t i s always toward th e eore from th e m id-poin t o f th e
an m lu e , th e re fo re th e in te n s i ty o f shear a t th e oor© w all i s
g re a te r th a n t h a t a t th e o u te r w a ll, s in ce th e v e lo e ity g ra d ie n t
i s s te e p e r In th e in n e r p o rtio n o f th e annulus* The v e lo e ity
d i s t r ib u t io n fo r s tream lin e flow in an annulus i s g iven as#
* -a - G 1- * 1' / -£ 7( 22)
o r
U * ____ _ /7 j> 1 , / t ? - * ? / xfp>ls 7 ,,, -% f * f 7
(®5)
From t h i s i t can be seen th a t th e r a t i o o f th e average v e lo c ity
to th e maximum v e lo c ity in an anm lue depends upon th e r a d i i o f
th e annulua, to th th e a b so lu te and r e l a t i v e valued o f thee*
r a d i i and t h i s r a t i o may be expressed as#
The r a t i o o f th e shear s t r e s s e s a t th e two su rfa ce s in th e
annalue i s g iven by#
These th e o r e t i c a l r e la t io n s h ip s fo r th e s tream lin e flow
reg io n have been v e r i f ie d experim en ta lly re c e n tly by Rothfu© ( 28#
29) i n a study w ith smooth co n cen tric annuli# However$ to r t u r
b u len t flow c o n d itio n s th e knowledge o f flow In annul! i s n o t as
w ell c la r if ie d * Since th e Reynolds Humber has proved so s a t i s
fa c to ry fo r u se w ith c i r c u la r pipe# i t has a lso been used fo r
s m a ll# b u t th e r e s u l t s have not been as s a t is f a c to ry in t h i s
ap p lica tio n * The Reynolds Number should be as s ig n i f ic a n t In
d efin in g flew c h a r a c te r i s t ic s i n an annulue as in a c ir c u la r pipe#
provided th a t th e proper v a r ia b le s may be found and used* The
tro u b le which has been met In t h i s a p p lic a tio n seems to a r i s e
from th e a ttem pts to extend th e law o f s im ilitu d e from c i r c le s
t o annul 1* When Brown's sta tem ent on page 10 concerning th e use
o f t h i s Reynolds Humber l a considered , then i t i s seen th a t an
azmulus i s n o t g eo m etrica lly s im ila r to a c irc le *
(2 4 )
^ 2 ( r i - R ' )
(25)
Therefor** s in ce geom etrica l s im lle r l ty I s a p re re q u is i te ,
dynamic s im ila r i ty w il l no t e x is t a t th e same va lue o f th e
Reynold• Number In th e two shapes*
Thl* lock o f s im ila r i ty has been neg lec ted In th e p a s t,
however, and th e Reynolds Number has been c a lc u la te d using th e
e q u iv a le n t d iam eter concept* One o f th e e a r l i e s t form ulae to
be used to compute th e flew in a l l s o r t s o f condu its was th a t
o f Chesy, in which a h y d rau lic ra d iu s term appeared (2)* T his
h y d rau lic ra d iu s i s evaluated by d iv id in g th e c ro ss* e eo tlen a l
area o f flow by th e w etted perim ete r o f th e conduit* The Ohezy
eq u a tio n i s ,
I f t h i s i s compared to th e Fanning Squatlon , Squat ion (2 ) , i t i s
t ie n a to g ive th e same f r i c t i o n lo sses* Thus, th e eq u iv a len t
d iam eter, De , la th e va lue o f fou r tim es th e h y d rau lic rad ius*
For an a nonius, * (Dg-D^)/4 and th© eq u iv a len t d iam eter i s
u su a lly tak en to be &2 -
By using t h i s va lue o f eq u iv a len t diam eter to c a lc u la te th e
Reynolds 'umber fo r flow in an annulus and th e n by using t h i s
v a lue to determ ine th e f r i c t i o n fa c to r from c ir c u la r pip© d a ta ,
i t has been p o ss ib le to o b ta in a good approxim ation o f th e f r i c
t io n drop fo r tu rb u le n t flow in an annulue. Although t h i s method
o f extending date i s not s a t is f a c to ry because th e re i s no
2.
( 26)
seen th a t f must equal 2g/0^ and D must equal 4r^ , fo r th e ©qua-
16
s im ila r i ty between th e two shapes* th e re have boon no o u ts tan d in g ly
su c ce ss fu l a l t e r n a te Tcethodc proposed* T herefore! moot m a te r ia l
p resen ted on th e study o f th e behavior o f f lu id s in annul! has
used t h i s e q u iv a le n t diam eter*
A ctually th e amount o f work which has been done on th e flow
o f f lu id s in annu lar spaces i s no t very ex tensive* In a review
VIegand and Baker ( 36) p resen ted a com pila tion o f th e work done
b e fo re 19^*2 on f t lo t io n lo se and h e a t t r a n s f e r in annull* Much
o f th e work p resen ted d e a l t w ith h e a t t r a n s fe r * bu t a comprehensive
l i s t i n g o f th e f r i c t i o n drop s tu d ie s was a lso given* The r e s u l t s
o f th e se a re p resen ted In Table II* In t h i s tab le* j i s de fined as*
These va lu es o f j p resen ted In Table I I w il l no t be d iscussed &t
t h i s point* but w il l be covered la te r*
From Table II* i t can be seen th a t sev e ra l o f th e investlga?-
t o r s worked in both th e s tream lin e and tu rb u le n t reg io n s o f flow*
The rep o rte d c r i t i c a l valuee o f th e Reynolds Numbers cover q u i te
a range and th e re seems to be a marked e f f e c t o f th e width o f th e
annulue on th e se values* The d a ta o f P icrcy in d ic a te t h a t th e
c r i t i c a l va lue o f decreases as th e width o f th e
anratlue decreases* w ith & c o n stan t ja c k e t diam eter* Another i n t e r
e s t in g fo o t i s t h a t th e c r i t i c a l va lue fo r th e ja c k e t alone I s 1620
whereas t h i s va lue fo r th e w idest annulu® i s 1020*
2 j
(S7)
17
TABUS I I
R e su lts of In v e s tig a tio n s on Annular Spaces a s Reported toy
Viegand and Raker ( 36 )
V » « 2f e e t
C r i t i c a l(Dg-Dj
V
J A o f3250 10,000
F lu id In v e s t ig a to r
0 .9 :0 .!
0.0100 .5150 .M 90 .513O.&MO0.6830 .7200.75*0.SO3
.3^30 L 0 . ^ o.soo
o.sUto
0.975o.9«5
0 .000o.jito0.6280.805
0.00000.00170 .00580 .01550.0202
.0723
.072320002000
. 00UU
. 00*0.001*0 Water
.09a •0051 .0039 Water
.0622
.0827
.0622
.0827
.1303
.0622
.1303
.0827
.1303
279029202710263019401980241+02080
.0
*888
8
88
88
8 Water
.192
.192
.192
.007
.006
.007
Air* Water Fuel Oil
.0617 .0036 W a te r
.266
.266
.266,266
. 00**0
. 00H2
. 003U
.0030Water
.172
.172
.172
.172 ll+oo
.0056
.00U7
.OO56
.0050
.00U4
.0038
. 00UU
.00*40
Water andCaClgtorlne
. 01+25
.01+25
. 01+25
. 01+25
. 01*25
16201020
920
2 8
.00§7
.006a
. 0060U
.00599
.00582
A ir
Becker ( 3 )
Winkel (37)
Lonsdale ( 23 )
Caldw ell ( 9 )
Sohneokentoerg (33)
e t . a l . (20)
P le rc y # e t . a l . ( 27 )
(a£) treats
XB *^0 'JCOJ0J£
*IV
Jiv
GhOO*8£00*
6£z6£2
moo*s£oo*
06910691
StiOO* It) 00*
£S*iT£Snt
iCoo*xnoo*
£i\2X&«x
6200*g£oo*
2*100* inoo*
S£ox££ox
Si.900* x£loo* TB900*iti900*89900*8iS00*29600*
xtji
±88
8lt£90S899
SznoS2*t0£21t0S2tioSztjOSsnoS21|0
996*0000*0
8X6*0000*0
209*0000*0
Soi*o000*0
sna’o000*0
2X9*0£6tt*0062*0£81*0o£x*o
ioi.o*oxx£o*o
°°0'°T 0fi2£ “i(Vza) *•** . PWi JO hK • ( T»OT»XJIO 2j *0/^
(«>o) xx rcm
81
19
When Pierey* et* s i .* ( 2 7 )* ob ta ined th e low c r i t i c a l
v a lu es o f th e Reynolds Humber as mentioned above* an appara tus
was co n stru c ted fo r th e v isu a l o b se rv a tio n o f flow in an
annulue. To do th is* a dye was in troduced in to th e flowing
water* I t was rep o rted t h a t t h i s dye th read was s t r a ig h t a t
lew v e lo c it ie s * b u t developed a wave o f email am plitude a t
s l ig h t ly above th e l im i t fo r r e c t i l i n e a r flow* A a l ig h t in
c re ase o f v e lo c ity produced an e a s i ly seen slow sinuous motion*
approxim ately a c irc u m fe re n tia l swaying* which f u r th e r developed
through a wide range o f in c re a se o f flow through th e an m lu s
b e fo re break ing up in to in co h eren t eddying* Waving th rea d s
remained approxim ately a t a co n stan t ra d iu s so f a r as could
be seen . The a x is o f o s c i l l a t i o n o f th e th read wandered m ostly
in a c irc u m fe re n tia l d irec tio n * bu t sometimes ra d ia lly * I t never
c irc u la te d around th e core*
When Lea and Tadros (22) were working w ith wide annul!* a
low c r i t i c a l va lue was obtained* They a lso found th a t th e ex
perim ental p ressu re drop fo r a wide annulue was not as g re a t as
th a t p red ic ted by theory* th u s i t was concluded th a t th e re was
s l ip o ccu rring a t one o f th e surfaces* probably th e su rface o f
th e core*
Rothfue ob ta ined c r i t i c a l v a lu es o f th e Reynolds tfumber on
two annular s e c tio n s . These were* 2100 fo r th e wider a n m lu s
and 2400 fo r th e o th er one* Carpenter* e t . a l (10) determ ined
th e p ressu re drops in an annulue fo r both s tream lin e end tu rb u le n t
80
flow conditions* Prom th o se d a ta fo r t h i s anm lus* th e c r i t i c a l
▼slue o f th e Reynolds Number was found to be approxim ately 12^0#
0* C onclusions*
Although co n sid erab le work has been done in th e general
f i e ld o f f lu id flow* moot o f t h i s has been confined to flow in
e i th e r th e s tream lin e re g io n o r th e tu rb u le n t region* There
seems to be a tendency to n e g le c t th e reg io n o f t r a n s i t i o n flow*
e sp e c ia lly th e manner i n which t h i s t r a n s i t i o n ta k e s p lace a t d i f -
f e r e n t p o in ts In th e flow section* Even when th e c r i t i c a l flow
cond itions have been reported* th e method by which th e se va lu es
wears ob tained I s no t u su a lly one o f d i r e c t o b se rv a tio n o f th e
flow mechanism, bu t r a th e r an in d i r e c t observation* most f r e
quen tly based upon p ressu re drop measurements* When t h i s s o r t
o f measurement le made* th e only way In which th e t r a n s i t io n may
be de tec ted i s by d e v ia tio n froar th e th e o re t ic a l l in e fo r stream*
l in e flew* T his d e v ia tio n probably ta k e s p lace in such a g radual
manner th a t th e p ro b a b il ity o f d e te c tin g i t i s low*
I t le a lso ev iden t th a t most o f th e work in t h i s f i e ld has
been confined to p ipes o f c ir c u la r c ro ss-sec tio n * From th e stand
p o in t o f s im ila r i ty th e o l r c le i s probably th e b e s t se c tio n fo r
study* because any l in e a r dimension in a c ir c u la r c ro ss se c tio n
may be expressed ae a fa c to r o f th e rad ius* However* t h i s
s im p lic ity o f measurement may be & m isleading fa c to r in th e study
o f f lu id flow* I f flow ic etud ied in an annulue* th en th e re a re
two su rfa ce s a t whlob f r i c t i o n occur© and a t l e a s t two l in e a r
a
dimension* a re req u ired to d e fin e th e se c tio n and point© in
th e ©action* A leo, due to th ee e two surf&eee o f d i f f e r e n t a rea
fo r f r ic t io n * th e v e lo c ity d is t r ib u t io n i s no t eyrametrioal about
a c e n tra l aids*
QHAP7KR I I I
SUMMRY OF EXPERIMENTAL WORK
A. A pparatus.
The ap p ara tu s ueed in t h i s work was a m o d ifica tio n o f th e
u su a l la b o ra to ry Reynolds Apparatus and i s shown in F igure Ho. !•
The major f e a tu re s o f i t were described in an e a r l i e r work {1^).
Two changes h a re been made einoe th a t tim e, however. The number
o f dye in ja e t io n tubes has been increased to three* two o f which
e re d ia m e tr ic a lly opposed and th e th i r d placed approxim ately th re e -
fo u r th e o f an inch o f f th e perpendioul& r b ise c to r o f th® ax is o f
th e o th e r two. In t h i s way t h i s tube does no t e n te r th e tube
r a d i a l l y . T his arrangem ent i e shown in th e d e ta i l o f Figure Ho* 1.
The dye tu b es could be moved by th e r o ta t io n o f th e notched wheel*
A* and th u s th e p o s it io n o f o b se rv a tio n changed. The dye tube* B*
was so ldered in to th e d r i l l e d end o f th e th readed b rass rod* C«
The dye was in troduced from above th® head tan k through th e dye
feed l in e and rubber tu b in g connected to a sh o rt tube* D* which
was so ldered in to th e b ra ss rod v e r t ic a l ly * These dye tubes were
made o f copper c a p i l la ry tu b in g , 0 .095 inch O.D. ©nd 0.045 inch
I .D . This dye in je c t io n se e tio n le a leo shown in T la tee I and II*
Im m ediately below th e g la s s o b se rv a tio n section* a one foot
le n g th o f s tandard iro n pipe was added so th a t th e e x i t e f f e c ts
would be minimized. This p ipe was connected to th e o u t le t se c tio n
which remained unchanged.
23
CONSTANT LEVEL HEAD TANK
Dye Injection Section, See Detail
'not -• K
itvorizod Iran Pip* Cara
ELEVATIONS
FRONT
*
i t
LEFT SIDE
Flo
w
DETAIL OF DYE INJECTION SECTION-Pip* to tubing connection
Dye tub*Dy# food tubing
Hond wheely g “ Brow rod
Iron pipe wall
ELEVATIONO I* t
Scale: I—i- I—i— I
TOP VIEW
LO U IS IA N A ST A TE U N I V E R S I T Y f y )
D E P A R T M E N T O F C H E M I C A L E N G I N E E R I N G Q J
VISUAL OBSERVATION APPARATUS FOR
FLOW IN ANNUL I__________DR. BY: T.A.FEAZEL IOATE . MAY, I SSI
SCALE: AS SHOWN I FIGURE NO. I
PLATE I
Photograph o f Dye In je c tio n S e c tio n , L e f t Side
PLATE I I
rhotogxaph o f Dye In je c tio n S e c tio n , F ron t View
26
Four cere© were te s te d i n t h i s apparatus* Th© diam eter
o f each core was ob ta in ed e t sev e ra l point® ©long th e len g th
o f th e c e re and th e average va lue o f thee# measurements wa©
ueed in th e e a le u la tio n a * Theee value© a re p resen ted in
Table I I I*
TABLE 111
Dimension© o f Pi pee Used in th e Experim ental Work
Anm luehttaber
Ja ck e tDiameter#Inches
C.D. o fCore#Inohee
Core D esc rip tio n
4
i
2
5.000
5.000
5.000
5.000
1.646 1 -i* s td . Galv. I ro n P ipe
1.047 5/4* S td . Gtelv. I ro n P ipe
0.6457 1/2* Bid. Oalv. I ro n Pipe
0.8457 1/2* S td . Copper P ipe
27
gw #rl»w nt« t p r o a t d w .
For each M o tio n te s ted * th e procedure follow ed was th e
same* The eo re wee plaoed i n th e ap p ara tu s and a d ju s te d u n til*
v is u a l ly i t seemed to be se n te re d in th e o b se rv a tio n se c tio n .
Flow was th en s ta r te d and by observ ing th e maximum v e lo c ity w ith
each o f th e th r e e dye j e t s t h i s c o n c e n tr ic i ty was checked* I f
th e maximum v e lo c i t i e s were n o t equal* th e n ad justm ents were made
w ith th e eore u n t i l e q u a lity was obtained* For s tream lin e flow
th e re i s no tra n s v e rs e p ressu re g ra d ie n t in a c ro s s -s e c tio n o f
flow* For t h i s to be t r u e in an e e e e n tr ie annulus* i t i s neces
sary th a t th e boundary shear s t r e s s be th e same a t a l l p o in ts on
th e eore* T his shear s t r e s s l e th e produot o f th e v is c o s i ty o f
th e f lu id and th e v e lo c ity g ra d ie n t a t th e wall* I f th e se v e lo o lty
g ra d ie n ts a re to be equal* th e n th e v e lo c ity d i s t r ib u t io n i n th e
w idest p a r t o f th e annulus must be such th a t th e maximum v e lo o lty
i s g re a te r th a n th e m axim a v e lo c ity In th e narrow est p a r t o f th e
ansulue* These maximum v e lo c i t i e s a re equal only when th e oore I s
concen tric*
When i t was determ ined th a t th e oore was concentric* v e lo o lty
d is t r ib u t io n s were ob tained a t a co n stan t flow r a t e In th e Bireaar-
l in e flow region* The p o in t v e lo c i t i e s were ob ta ined by t h i s dye
in je c t io n method by in iro d u o tin g th e dye slowly so th a t i t emerged
from th e t i p o f th e dye tube a t approxim ately th e came v e lo c ity as
th e w ater and th en i t was allowed to t r a v e l a ab o rt d is tan c e b efo re
th e movement was timed* This time* was t h a t req u ire d fo r th© dye to
20
move between two measured po in ts* I t was neoee&ary to r e s t r i c t
t h i s v e lo c ity d e te rm in a tio n to th e s tream lin e flow co n d itio n
because th e dye w ill n o t rem ain a t th e same ra d iu s when th e
flew I s no longer stream line* th e se v e lo c ity d is t r ib u t io n s were
ob ta ined on bo th s id e s o f th e oore to g ive an in d ic a t io n o f th e
symmetry about th e sore*
The maximum v e lo c ity In th e se c tio n was ob tained by i n j e c t -
lug a la rg e mass o f dye in to th e moving stream and tim ing th e
t r a v e l o f th e f a s t e s t portion*
A fter sym m etrical v e lo c ity d i s t r ib u t io n s were obtained# one
o f th e dye tu b es was plaeed a t a d e s ired p o in t and th e flow o f
th e dye and w ater both s ta r te d a t a low ra te* The behavior o f
th e dye stream was observed and d escribed and th e v e lo c ity a t
th e o b se rv a tio n p o in t and th e maximum v e lo c ity in th e se c tio n
were determined* When t h i s was done a t t h i s flow ra te# th e r a t e
was in c reased s l ig h t ly and th e o b se rv a tio n repeated* This was
continued u n t i l tu rb u len ce appeared a t th e p o in t o f observation*
When th e se o b se rv a tio n s had been made e t one point# th e dye
j e t was moved to ano ther lo c a tio n and th e o b se rv a tio n rep ea ted
there*
0* L im ita tio n s o f Apparatus and P a ts *
The appara tu s has c e r ta in in h e re n t lim ita tio n s* Due to th e
s iz e o f th e dye tube# th e c lo s e s t th a t th e c en te r-iin © o f th e dye
j e t oould be brought to th e w all was 0 *0*W>9 inches* However# t h i s
v a lu e could not always be obtained* In bending and forming th e
29
dye tubes* c e r t a in im p e rfec tio n s arose* One o f ih ee e was th e
f e e t t h a t th e len g th o f dye tub ing p a r a l le l to th e w ater flow
wee s o t e x a c tly p e rp en d icu lar to th e tra n s v e rs e p o rtio n o f
th e dye tube* I f th e ang le between th e two wee lean th an 90°,
i t wee n e t p e ee lb le to p lace th e dye tube a g a in s t th e core w alls
and I f th e ang le was g re a te r th an 90°$ I t wae n o t p o ss ib le to
p la c e th e tube a g a in s t th e g lace wall* Also th e bend In th e
tu b in g wae curved and no t rig h t-an g led * so t h a t th e tu b e d id
n e t peso through th e s tu f f in g box and l i e f l a t a g a in s t th e p ipe
w all*
lie measurements o f proa aura drop were made* because th e
measurement o f p re ssu re d if fe re n c e s o f th e o rder o f magnitude
e f th o se which e x is te d h e re (approxim ately *00^ in ch o f w ater fo r
th e f i r s t f o o t o b se rv a tio n se c tio n ) would have req u ire d th e develop*
cen t and c a l ib r a t io n o f an e x ce p tio n a lly s e n s i t iv e ml©r©manometer•
As was sa id e a r l ie r* th e d e te rm in a tio n o f p o in t v e lo c i t i e s
by th e method e f dye in je c t io n tree l im ite d to th e s tream lin e flow
region* These v e lo c i t i e s were determ ined by tim ing th e t r a v e l o f
th e dye th rough len g th s o f 1* 1^ o r 2 fee t* The longer le n g th s
were used to detarm ine th e h igh v e lo c it ie s * When checks were
made on th e v e lo c ity d e te rm in a tio n s a t a point* i t was found th a t
th e maximum d e v ia tio n between th e two was 0*4 seconds i n th e
minimum observed tim e o f approxim ately 10 second a* T his gave a
maximum d e v ia tio n o f approxim ately
The major source o f e r ro r e n te r in g in to th e da ta o f t h i s
re se a rc h was th e doubt involved in th e p o s it io n o f th e dye tube*
30
A c a l ib r a t io n curve was made fo r th e p o e itio n o f each tube ae
a fu n c tio n o f th e number o f tu rn s o f th e handwheel* Theee
tu rn s were measured from th e n e a re s t p o s i t io n o f th e dye tube
to th e g la s s wall* The c a l ib r a t io n was ob ta ined by suspending
th e dye i n l e t s e c tio n above a p iece o f paper and determ ining
th e d ir e c t io n e f th e dye tube movement* Then th e assembly was
connected to th e g la s s p ip e se c tio n and read ings o f p o e itio n
made using a p iece o f s t e e l tap e placed aeroas th e section* I t
was p o ss ib le to read th e g rad u a tio n s on th e ta p e to 1/ 52% so
t h a t th e maximum probable e r ro r o f th e s e read ings was 1/ 52%
which was eq u iv a le n t to k tu rn o f th e handwheels*
In th e o b se rv a tio n s o f th e dye behavior* care had to be
tak e n th a t th e dye did not e n te r th e w ater a t a h ig h er v e lo c ity
th a n th a t o f th e water* I f t h i s was done* th e dye *piled**up*
and spread o u t in th e flow* g iv ing th e appearance o f non-stream*
l in e flow* A ctu a lly I t was not d i f f i c u l t to c o n tro l th e flow o f
dye so t h a t t h i s did not happen and th e c r i t e r io n used was th a t
th e diam eter o f th e dye stream leav in g th e dye tu b e should always
be sm aller th a n th e diam eter o f th e opening In th e tube* When
observing t h i s precaution* th e dye seemed to be drawn ou t o f th e
tu b e and picked up by th e w ater to be o&rriod downstream*
The lo c a tio n o f t h i s appara tus was suoh t h a t a t tim es i t was
sub jec ted to a g re e t deal o f ex traneous v ib ra tio n s and t h i s has
caused some o b se rv ers o f th e work to have q u estio n s regard ing th e
e f f e c t o f th e s e v ib ra t io n s on th e flow behavior* During th e
sugar season a c e n tr ifu g e nearby was operated q u ite fre q u e n tly a t
%
th© ©aw© tim e th a t experim ental work was being c a r r ie d out*
I t wee observed, however, t h a t air©amiin© flow was m aintained
under th e e e ©ever© v ib ra t io n s , and i t wae a le e found th a t
very good s tream lin e flow condition© e x is te d when th e eo re
could be seen to v ib ra te* I t i s to be concluded from th e s e
o b se rv a tio n s t h a t , ( l ) below some c r i t i c a l flow r a t e , stream*
l in e flew I s com pletely s ta b le to any v ib ra t io n , and ( 2 ) th e r e
was no p o s s ib i l i ty o f m e ta s ta t ic condition© g iv ing s tream lin e
flow a t h igh r a t e s o f flow*
D* T ests o f D ata,
The d a te ob tained were te s te d in sev e ra l ways* The v e lo c ity
d is t r ib u t io n s ob ta ined fo r s tream lin e flow co n d itio n s were com*
pared w ith th e th e o r e t ic a l d is t r ib u t io n s ob tained by Equations
(25) and (84)* These were combined to g ive a th e o re t ic a l va lue
o f th e r e t i e e f th e p o in t v e lo c ity to th e maximum v e lo o lty in th e
section* These th e o r e t ic a l r a t i o s app lied fo r any flow r a te as
long as th e flow was s tream lin e th roughout th© section*
The p o in t v e lo c i t ie s ob tained under a l l flow co n d itio n s were
compared to th e se th e o r e t ic a l r a t i o s to determ ine th e e f f e c t o f
th e In c re a se ir< flow r a t e upon th e v e lo c ity d is tr ib u tio n * With
th ee e p o in t v e lo c i t i e s i t was p o ss ib le to o b ta in th e v e lo o lty
d is t r ib u t io n s a t a number o f d i f f e r e n t Reynolde Numbers* Xt was
a ls o p o ss ib le to o b ta in th e v e lo c ity g ra d ie n t, du/dy, a t th e
v a rio u s p o in ts in th© c ro n e -se c tio n as a fu n c tio n o f th e Reynolds
Chamber* By p lo tt in g th ee e v&lues o f v e lo c ity g ra d ie n ts a t th e
5®
same Reynolds Number a g a in s t th e p o s i t io n In th® se c tio n , and
by e x tra p o la tin g th ee e p lo ts to th e w a lls , th e v e lo o lty
g ra d ie n ts a t each w all were obtained* The v a lu es o f th e se w all
g ra d ie n ts were determ ined a t se v e ra l Reynolds iumbere and th e
v a lu e s were p lo tte d a g a in s t Reynolds Number*
As a cheek on th e observed v e lo c ity d is t r ib u t io n s , th e
In te g ra l o f udA was o b ta in ed g ra p h ic a lly and compared w ith th e
flow r a t e in d io a te d by th e ro tam eter*
The von Kerman reduced fu n c tio n s , u * and y + , Equations
( a ) and (9 )# were c a lc u la te d , assuming th a t th e shear s t r e s s a t
a s Ion? as th e r e e x is t s a lam inar la y e r o f f lu id near th e w all*
The va lu es ob ta ined fo r th e s e ex p ress io n s were p lo tte d and com*
pared w ith E quations (1 4 ) , (12) and (16) p resen ted by Mlkuradse*
C r i t i c a l c o n d itio n s a t v a rio u s p o in ts i n th e se e tlo n e were
ob tained by observ ing th e l a s t s tream lin e behavior and th e f i r s t
tu rb u le n t behavior a t each point* The o r l t i e a l va lue a t th e
p o in t was th e n between these* Theee c r i t i c a l co n d itio n s were
expressed in se v e ra l ways* Zn th e p a s t th e o r l t i o a l flow r a t e
fo r an anisilue hr e been expressed as a c r i t i c a l va lue o f th e
Reynolds dumber, . T herefo re , th e value o f t h i s
term was ob tained fo r every d e te rm in a tio n made* The o r l t i e a l
v a lu es o f t h i s exp ress ion fo r each p o in t were p lo tte d a g a in s t
p o s it io n in th e s e c tio n , expressed as th e ra d iu s o f th e p o in t,
g iv in g on in d ic a tio n o f th e amount o f th e f lu id which was flowing
i n each o f th e mechanisms*
a v a lid assum ption
35
Since th e p o in t v e lo c i t i e s wore observed when determ ining
th e s e o r l t i e a l c o n d itio n s , th e p o in t o r l t i e a l v e lo c i t ie s wore
a ls o obtained* Since a l l de te rm ina tion* were n e t made a t
e x ac tly th e came tem pera tu re , i t was necessary to b ring them
to a common b a s ic ! accord ing ly th e v e lo o lty was d iv ided by th e
k inem atic v is c o s i ty o f th e f lu id * T his r a t io u/V was p lo tte d
a g a in s t p o s it io n in th e annulus*
A p o in t o r l t i e a l Reynolds Rumber was a lso ob ta ined fo r each
p o s it io n by m u ltip ly in g u /V by y th e d is ta n c e o f th e p o in t from
a wall* T his d is ta n c e was measured from th e g la s s w all fo r th o se
p o in ts between th e g la s s w all and th e p o in t o f maximum v e lo o lty
and from th e eore w all fo r th o se p o in ts between th e eore and th e
p o in t o f m axim a v e lo c ity * P lo ts were made o f th e s e c r i t i c a l
v a lu es a g a in s t y fo r each annulus*
R ouse's s t a b i l i t y param eter*%$ Equation (17)* was a lso
ob tained fo r th e o r l t i e a l flow c o n d itio n s a t each p o in t and th e
v a lu es o f t h i s p lo tte d a g a in s t th e p o s i t io n o f observation* This
wae done to determ ine th e u se fu ln ess o f t h i s parameter* A ll d a ta
necessary fo r th e d e te r mi n a tio n o f "3 * have been p resen ted above,
y , du/dy and V* •
CHAPTER X?
KXFSRIMBJflVJi RESULTS
A* G enera l*
Whan th e flow o f th e w ater was s ta r te d In th e se c tio n s end
m aintained a t a low r a t e , s tream lin e flow wae obtained* In th le
flow th e dye emerged from th e dye tu b e and tra v e le d th e len g th
o f th e o b se rv a tio n se c tio n w ithout a break o r iu te ru p tio n * As
th e flow r a t e was in c reased however* t h i s behavior d id n o t p e rs is t*
Instead* a slow« sinuous motion was im parted to th e dye* T his
motion was a wave o f long w ave-length and high amplitude* At
tim es i t s w ave-length was so long t h a t only two cy c les were p re sen t
in th e f iv e - f o o t o b se rv a tio n length* F igure 2 (a ) p re sen ts a
sketch o f t h i s motion* I n S ec tion A-A o f t h i s sketch# th e dye
th re a d I s p ic tu red as being d is t r ib u te d e iro u m fe re n tia lly a t th e
ra d iu s o f th e p o in t o f observation* T his view o f th e se c tio n was
n o t v is ib le # but i s based upon th e f a c t th a t th e dye th read remained
a t a p o s it io n o f c o n stan t v e lo c ity w hile in t h i s motion* For con
c e n tr ic annuity p o in ts which have th e same v e lo c ity a re a t th e
same p o s it io n r e l a t i v e to th e cen te r o f th e system* This wave was
sym m etrical about th e im aginary l in e extending from th e dye tube
to th e bottom of th e o b se rv a tio n section* While e x h ib itin g t h i s
sinuous motion# th e dye was not broken in any way# th e re fo re th e
flow was described as stream line*
&
55
In F igu re 2 (b ) a wav© a c tio n I s shown o f much sh o rte r wove
le n g th th a n th a t In (a )# This motion was observed when th© flew
r a t e was in c re a sed above th a t a t which th e sinuous motion appeared*
This s h o r te r wave had a sm aller am plitude th an th e slow sinuous
motion* b u t was s t i l l seen to e x is t a s a continuous stream through**
o u t th e o b se rv a tio n length* When th e flow r a t e was increased
slowly* t h i s type o f wave a c tio n continued and m aintained approx
im ately th e same wave length* b u t th e number o f waves passing a
p o in t in c reased w ith th e flow ra te * S t i l l th e dye e x h ib ited sym
metry about th e p o s i t io n o f th e dye tube end gave no signs o f a
r a d ia l movement* This ty p e o f flow was a lso considered stream line*
s in ce th e dye stream remained continuous*
As th e flow r a t e was in creased more* th e ra p id wave a c tio n
was rep laced by a snapping n o tio n or tu rb u le n t bu rsts* as shown In
F igu re 1 (o)* In t h i s no tion th e dye th read was com pletely broken
by th e s e snaps and th e re g u la r wave p a tte rn was rep laced by an i r
re g u la r p a tte rn * This was considered th e f i r s t appearance o f
tu rbu lence* S lig h tly above t h i s flow ra te* edd ies were formed and
th e dye was d is t r ib u te d over a p o r tio n o f th e annulus*
The o b se rv a tio n s p resen ted In F igure 2 were obtained a t a l l
p o s it io n s in th e sections* b u t th e flow ra te s a t whloh each ty p e
e x is te d a t v a rio u s p o in ts in any one se c tio n were n o t th e same*
Thus th e d isc u ss io n above a p p lie s to th e general behavior o f th e
dye fix ed a t a p o in t as th e flow r a t e was increased*
Another type o f flow p a tte rn was observed when th e flow a t
a p o in t was no longer stream line* T his i s shown In f ig u re No* 5*
36
G l o s s J a c k e t
O
D y e T u b e
C o r e
D y e T u b e
SECTION A-A
- D y e S t r e a m
( b )( a )
D y eS t r e a m
( c )
FIGURE NO. 2 - TYPICAL WAVE MOTIONS OBSERVED
5 7
When viewed from th e Bide* th e wave p a tte rn was broken, h u t th e re
wee no in d ic a t io n o f mixing* From th e f ro n t o f th e apparatus*
however* i t wae eeen th a t th e dye had been p a r t i a l l y d is t r ib u te d
aereee th e e e e tio n eo th a t a l l o f i t wae no t in a p o e itio n o f
c o n s ta n t v e lo o lty * When th e dye wae d is t r ib u te d in t h i s manner
th e r e wae a d if fu s in g e f f e c t ev id en t in th e decreased concentra
t io n o f c o lo r and a la o in th e widening o f th e co lo r band* When
th ie happened to th e flow pa tte rn* th e flow wae no longer eon*
e ldered stream line*
To e e ta b l is h s tre am lin e flow in th e se c tio n s te s ted * i t was
necessary to o p e ra te w ith very low flow ra te s* such th a t th e
average v e lo o lty in th e annulus wae approxim ately 0*10 f e e t per
second* These v a lu es were eo sm all t h a t i t was im possib le to
o b ta in s tream lin e flow when th e d if fe re n c e between th e tem perature
o f th e w ater and th e a i r wae g re a te r th a n 15° This was thought
to be caused by th e convective c u rre n ts e s ta b lish e d by h e a t t r a n s
fer* During th e w in ter months th e surroundings o f th e appara tus
were not heated so th a t th e tem pera tu re o f th e w ater was h ig h er
th an th e tem pera tu re o f th e a ir* As th e water flowed through th e
system i t l o s t some o f i t s h e a t and in doing so th e lay e r o f w ater
n ex t to th e ja c k e t became coo ler th a n th e r e s t o f th e water* This
d if fe re n c e in tem pera tu re in a c ro s s -s e c tio n caused a d if fe re n c e
in d e n s ity to e x is t so th a t motion in th e tra n s v e rse se c tio n wae
induced* T his e f f e c t wae g re a te r in a wide anm lue* Ho* 2* th an
in a narrow annulus* Ho* ;$* s in ce th© maximum v e lo c ity fo r e t roam-
l in e flow was about h ig h er in th e narrow section*
38
G l a s s J a c k e t
C o r e
D y e T u b e
SECTION A -A SECTION B-B
- D y e - S t r e a m
SIDE VIEW FRONT VIEW
FIGURE NO. 3 - DYE SEPARATION PATTERN
359
l a a lm ost any work i n th e flaw o f f lu id s* th e re l a u su a lly
• p m l& t lo n concerning th e e x is te n c e o f a lam inar * film M o f f lu id
a t a * u rf i# i« In t h i s ap p ara tu s t h i s *film * was on do v is u a l by
d i r e c t in g a stream o f dya toward th e ao ra w all* I f t h i s was dona
w h ile th e f lu id waa moving* a vary g ro a t v e lo c ity g ra d ie n t became
v i s i b le and th e dya wae " s tre tc h e d " in to a th in line* w ith one
end rem aining alm ost s ta t io n a ry a t th e p o in t where I t f i r s t ap
proached th e eore* Whan viewed from d i f f e r e n t p o sitio n s* t h i s l in e
seemed to stand away from th e wall« However* t h i s d ls ta n o e could
n e t be measured as such due to m ag n ifica tio n a t t r ib u ta b le to th e
d i s to r t io n o f th e w ater and (o r ) th e cu rv a tu re o f th e g la s s Ja c k e t.
I f th e dye tu b e was p laced so th a t th e dye emerged from th e tube
and clung to th e wall* i t s p resence on th e w all a t th e p o in t o f
emergence was observed even a f t e r th e flow o f dye had been stopped
fo r approxim ately two m inu tes. A ll o f th e dye d id n o t remain
m otionless* b u t t h a t p o rtio n on th e eore did* T his was p a r t i a l
v e r i f i c a t io n o f a fundam ental assum ption in th e development o f
th e th e o r e t ic a l laws fo r s tream lin e flow t t h a t th e v e lo c ity o f
th e f lu id a t a su rfa ce i s zero*
I f one o f th e dye tu b es was p laced in th e c e n tra l p o rtio n o f
th e anoulue and ano ther plaoed so t h a t th e dye was near th e core*
i t was seen th a t th e flow became tu rb u le n t In th e c e n tra l p o r tio n
w h ile th e flow was s t i l l lam inar a t th e core w a ll. The same
o b se rv a tio n was ob tained by p lac ing th e dye tube so t h a t th e dye
was near th e g la s s w a ll. For v a lu es o f g re a te r th a n
55OO in Anoulue Do* 5 s tre am lin e flow was no longer in d ic a te d ©i
th e g la s s w ell* Howevert t h i s d id n o t preclude th e e x is te n c e
o f th e * fil» * a t t h i s ra te# because th e th ic k n e ss o f th e "m m *
was probably le e e th a n th e w idth o f th e dye stream# thus# th e
behav io r o f th e dye stream was no longer in d ic a t iv e o f th e f lu id
behavior*
B* T e lo c ity Measurements*
The th e o r e t i c a l v a lu es fo r th e ra d iu s o f maximum v e lo c ity
and th e r a t i o o f th e average to th e maximum v e lo c ity fo r stream*
l in e flew in th e an n u li te s te d a re p resen ted In Table IT* These
va lues were ob ta ined by u se o f fiqu&tlons ( 21 ) and (24)*
TABLS IV
T h e o re tic a l P ro p e r t ie s o f th e S ee tlo n s Tested
Annolus No* ®2in*
£ to r m*x.In* Vmax.
1 1.55* •5*9 1.144 0.669
2 1.955 •549 O.969 0 .6 6 2
5 2 .156 .282 0.904 O.657
4 2 .156 .282 0 .9 0 4 0 .6 5 7
In F igu res 4# 5# 6# and 7# th e v e lo c ity d is t r ib u t io n s as
ob ta ined in th e s tre am lin e flow reg io n a re presented* In thee© d is
t r ib u t io n s # th e p o in t v e lo c i t i e s were expressed a s p ercen t o f th e
rtvm
,-«w
yvM
y-
. »
ton
Mgxi
mjm
Vel
ocit
y
.
-<j
> •
o
Q C
,
FIGURE NO. 5 * Velocity Distribution for Anniiilus No. 2
Reynolds N u m b e r - 8 5 0
R t . T r a v e r s e L e f t T r a v e r j s
C l
>
<40=2
Q_
I . f3 07105 2 3
R a d iu s o f p o i n t , in
43
6 - Velocity Distribution for Reynolds fslumber -:9 70 i j
FIGURE
O <*
3
: i I : .^O i I ;R a d iu s cjf Po n t^ i|i.
; 70
44
f j g Or e NO. 7 “ V e lo c i ty D isftri l i j ;
Reynolds N um l
bufion lfoi[ A n r tu lu s N b . 4
b e | r - 1255 P P
100
. 9 0 j |
ladiuis cf Poibtjln,l.-O l . ' iO
4?
observed maximum v e lo c ity * The th e o r e t ic a l d is t r ib u t io n s an
g iv en by com bination o f aquations (2 1 ), ( 2 J ) , and ( 24) e re
in d ie a te d by th e s o lid curves*
From th e se f ig u re s i t seems th e b e s t agreement w ith th e
th e o r e t ic a l v a lu es was ob ta ined w ith Annultts Ho# 1* tthon each
o f th e s e o b se rv a tio n s was made th e flow was seen to be stream
l in e th roughou t th e c ro ss se e tio n j th e maximum v e lo c i t ie s ob
ta in e d w ith th e th re e dye j e t s were very nearly th e same, and
th e r a t i o s o f th e average v e lo c ity to th e maximum v e lo c ity were
approxim ately equal to th e th e o re t io a l values* In a l l v e lo c ity
d is t r ib u t io n s o b ta in ed , th e maximum v e lo c ity found by in je c t in g
th e ty e blob was u su a lly h ig h er th an th e maximum o f th e p o in t
v e lo c it ie s * The v e lo c i t i e s in th e o u te r p o rtio n o f th e se c tio n
a g ree more e le s e ly w ith th e th e o re t io a l curve th an th o se in th e
in n e r portion# The measured v e lo c ity probably was th a t o f th e
p o s i t io n o f th e o u ts id e o f th e dye tube and no t th a t o f th e
e en te r* lln e* A c o n s tan t s h i f t i n p o s i t io n o f 0*04 inches toward
th e co re w all would g ive much c lo s e r agreement w ith th e th e o r e t ic a l
carve*
The b e s t smooth curves were drawn through th e se experim ental
v e lo c i t i e s and th e r a t e o f flow ob ta ined by g rap h ica l in te g ra t io n
fo r comparison w ith th e t r u e flow in th e section* These va lues
a r e p resen ted below#
m
A nm lusNo* -r'
Average V elocity f t* /s e c *
In te g ra te d Actual
% Error o f In te g ra te d V elocity
1-R ig h t 820 0*0669 0.0661 1*21- L e f t 820 0*0607 0,0661 - 8*1
2 -R ight 850 0,0*05 0.04*9 - 9*02 -L e ft 85O 0*040$ 0*0445 - 9*0
5 970 0,0*4* 0,0551 —16*4
A 1255 0,059* 0*0670 - 17 .5
The d is t r ib u t io n s ob tained in a n m li 5 and A showed th e l a r g e s t
e r ro r In in te g ra te d flow va lue* • Theee annul! were formed w ith
th e same e ls e core* but Ho* J wee made w ith ga lvan ised iron# a
rough core and Ho* A w ith Copper pipe# a smooth core* The f a c t
t h a t both o f th e s e gave th e same g en era l v e lo c ity d is t r ib u t io n
showed th a t th e r e p ro d u c ib il i ty o f th e d a ta was good*
The d e v ia tio n s o f th e p o in t v e lo c i t ie s in th e in n e r p o rtio n
o f th e a n m li could r e s u l t from th e f a c t th a t th e two su rfaces
o f th e a n m li a re o f d is s im ila r m ateria ls* This i s no t sup
ported* however* by th e f a c t th a t th e v e lo c ity d is t r ib u t io n s in
F igures 6 and 7 a re approxim ately th e setae w ith a smooth oore
rep resen ted in F igure 7 end a rough one in Figure 6*
I n F igures 8 and 9 th e r a t io o f th e average v e lo c ity in th e
se c tio n s o f th e maximum observed v e lo c ity I s p lo tte d with va lues
o f w - f a # <rhe p o in ts p resen ted were determ ined in -Re -7^
d e p e n d e n t ly a t th e corresponding Reynolds Number and do not
Aye
rpqq
V
eloc
ity
Mox
imum
V
eloc
ity
Ratio of Annulus
. FIGURE NO. 8 - city . to notion of
imum Veto Reynolds Ni
erageVelc I as a
Q Q Q Q Q c Pr \ O (
Streorfime -Flow
T~ " T
rI-
0 : 8 0
— - *
oO <?o 0 \o o 0° oS5 -' 1 u a • t?p- o -
I o °o O . 0~JTV& p 5 ~n Stream line flow"
o
©-4SM - <5-
— i
■ i—
8 0 0
o o00 1 o1O f o
i—Q-
O o jAnnulus No. 2
lOpO W 1 4 0 0"D .jV
1000r ~
1 8 0 0
m
FTGlifRE NO. 9 | Ratio of Average Velocity to MaxFmum Velocity In Annulji No. 2: S^3Reynolds Numb
A nnulusan ju^S tream line Flow
1000
CD
S5 5 C 2600 m ) 0
Fdprecen t check d e te rm in a tio n s made a t 0. constan t flow ra te*
For Annulus No* 2# thi© r a t i o waa approxim ately equal to th e
v a lu e fo r pu rely s tream lin e flow to ®R * 1100* Above thl®
va lu e o f Reynold© tim ber th e r a t io in creased ©lowly a© th e
flow r a t e wbb increased* The f i r s t appearance o f tu rb u len ce
i n th e ©action was th e cause fo r th ie break from th e s tream lin e
flow v a lu e and th e r a t i o in c reased as th e amount o f th e f lu id
i n tu rb u le n t motion increased* The maximum value which th ie
r a t i o w il l a t t a i n wae not determined# but from Rothfu®‘e d a ta
fo r an annulus o f C^/Dg * 0*162 th e va lue a t * 21 #600 was
0*826 and fo r Dj/B2 * 0*650 th e va lue a t * 14#400 was
0 *807* Theee va lues in d ic a te th a t th e l im itin g value o f th e
r a t i o In an an ru lue ie g re a te r th an th e value fo r c ir c u la r pipe*
For Annulus No* 5# th e p lo t o f t h i s r a t i o shows a g radual
in c re a se ever th e e n t i r e range in v es tig a ted # from * 1000 to
*R . * *700* Although s tream lin e flow was ob tained throughout
th e s e c tio n a t v a lu es o f NRe le s s th an l 400t t h i s r a t io was
always found to be h igher th an th e th e o re t io a l value* For th e
range o f Reynolds Numbers between 1000 and 1400 th e average ex
perim enta l va lue was approxim ately 8$ h igher th an th e th e o re t ic a l
va lue fo r t h i s anrulue* The r a te o f in c re a se o f t h i s r a t i o w ith
th e Reynolds Number was not so g re a t as th a t fo r Annulus No* 2#
b u t was approxim ately th e same as th a t fo r Annulus No* 1# th e
v a lu es fo r whieh a re p resen ted in F igure No. 8 * For t h i s annulus
th e experim ental r a t i o o f th e v e lo c i t ie s i e again always h igher
50
th an th e th e o r e t ic a l v a lu es by approxim ately 5%*
I n F igu res 10 and 11 th e v a r ia t io n In p o in t v a lo c i t ie s
to r Annuli No* 2 and 5 w ith tho Reynolds Number based on th e
average v e lo o ity i s shown* These v e lo c i t i e s a re expressed as
percen tage o f th e average v e lo c ity , For a p o s it io n w ith a
v e lo c ity l e s s th an th e average ve lo c ity * t h i s r a t i o in creased
as th e flew r a t e Increased* and th e op p o site was t ru e fo r th e
p o s it io n s w ith v e lo c i t i e s g re a te r th an th e average ve loc ity*
Using th e s e v a lu es o f p o in t v e lo c it ie s * v e lo c ity d i s t r i
b u tio n curves w e e ob ta ined a t d i f f e r e n t Reynolds Numbers and
from these* th e v e lo c ity g ra d ie n ts a t d i f f e r e n t p o in ts in th e
s e c t io n were obtained* P lo ts were th e n made o f v e lo c ity g ra d ie n t
v e rsu s p o s i t io n in th e s e c tio n and th e se p lo ts ex tra p o la ted to th e
wall* o b ta in in g an approxim ation o f th e g ra d ie n t a t th e wall* The
v a lu e s ob ta ined by t h i s method fo r Annul! 2 and 5 a r © p resen ted
i n F igure No* 12* In t h i s f ig u re th e v e lo c ity g ra d ie n t a t th e
Reynolds Number.
The w all shearing s tre s s* *72 * i s g iven by th e product o f th e
v is c o s i ty and t h i s v e lo c ity g ra d ie n t and fo r s tream lin e flow* th e
r a t i o o f th e shear a t th e in n er w all to th e shear a t th e o u te r
w a ll in an annulus i s g iven by Equation ( 25)* For Annulus No* 5»
th e value o f t h i s r a t i o in s tream lin e flow i s 1*5&* The experi
m ental r a t i o found from th e e x tra p o la tio n o f tho v e lo o ity g ra d ie n t
p lo ts v a ried from 1*60 a t s 1600 to 1*665 s 2^00*
was p lo tte d a g a in s t th e
Avg
V
teJa
clty
IS
*r = r.049
OrTO
r~h 4 0 6
poo
FIGURE W U H E ffe
22 0 0 n v m > u
Iip Reyjnoltis Numof tncrea on Point [Velocities. . L . ... .
ulus No. 3
53
FIGURE NO. 12“ Velocity Gradients at Walls as Functionsof Reynolds Number
0 . Annulus No.t,. Wbll
Li O ^ i j l u ^ N p . . j j
(Og “ D| ) Vjjyq 7 ^ —
5*
T his lncr«ae« in th e r a t i o in d ic a te d th a t th e shear s t r e s s a t
th e in n e r w all was in c re a s in g more ra p id ly th an th a t a t th e
e n te r w all in th e range o f flow covered* The only way th a t
t h i s could occur so th a t both o f th e shear s t r e s s e s would g iv e
th e s a mo p re ssu re drop was fo r th e p o in t o f maximum v e lo o ity
to s h i f t toward th e o u te r w all 00 th a t th e value o f Equation (25)
could be increased* I f t h i s p o in t o f maximum v e lo c ity s h if te d
toward th e o u te r w a ll, and i f th e v e lo c ity g ra d ie n t a t th e core
w a ll In c reased f a s te r th an th a t a t th e o u te r wall* i t was
necessary th a t tu rb u le n ce appear between th e co re w all and th e
p o in t o f maximum v e lo c ity be fo re i t appeared In th e o u ter p o rtio n
o f th e annulus*
Prom th e v a lu es o f th e w all shearing s t r e s s ob tained from
th e v e lo o ity g ra d ie n ts a t th e walls* th e von Karatam reduced
v e lo o ity and p o s it io n term s g iven in Equations (6 ) and (9 ) were
evaluated fo r Annuli Ho* 1 and 5* In f ig u re 15 th e values o f u +
and y a re p lo tte d * Some o f th e se va lues were ob tained from
th e v e lo c ity d is t r ib u t io n de te rm ina tion p resen ted in F igure Ho* 4 .
In th e se th e v e lo c ity g ra d ie n t a t th e w all was assumed to be th a t
which would apply in th e s tream lin e flow condition* Tho o th e r
p o in ts in F igure 15 were ob tained from th e l a s t observed stream r
l in e flow c o n d itio n s and th e f i r s t observed tu rb u le n t flow con
d i t io n s in th e section* These experim ental po in ts do no t fo llow
th e equations o f Kikuradee ae g iven In Equations ( 14}» ( 15) and
(1 6 )# b u t in d ic a te l in e s p a ra l le l to th ese expressions* The
2 0
10-
FIGURE NO. 13- 1. —
r '^’ 1 ^7 TI' r*fI .1 >i • I '" i r ‘’iM'w't’ 4(Vftr|», i ,1.1 I
J .I ' '■ \ - l I ,f* ... JT* IrT
i d Velocity Distribution for Annulua No.(
j ■ -l-t U*[m |
■ UlU
.* i**--* i.1. -„,u4
: t
f f
|-4 !:j ;" I 'o 'L o i t Observed Stream line Flow • ■
4 First Observed Turbulent Fiow ^
J+ Velocity Dtptrfbotieniot+ N*. *820 ~- NIkuradse*e 1 V6lu#s, : . ' * i
* *— i Experijiseh foi
t
•' t-t - * ■ f", . J . . . . . 4.444'■ i !■ 1 ■!- j . . . . • — - »+»tT+.
4 ,*4 : ..i ^ .j..,r L ^ • *-j........ • U> - 4 .-+
. . i
i-i- 4-
~l____
4, - I ---4------
;-H - <~H....-i - . - , 4 u_. . . . . ^T , . 4- . 4 : .
4-^...^4!- j•j-’j
j —J - --+ -f—; ji. . u J . 4 -^ .4
. . , . . - 4- . . .
.4 4 i'..!.-4 fc~ n .7 : ± ~ 4 ± :
. l - U
• t-
It* -i ..--- t - . i—........................
g h a r r i
■’ r
t i• - - • - -- • '4 rf 4*. *■ -*{"f**+-r*,*7**4 -ft""!
. 44-44 !4
i •
4 -
* — |_i LI j. J! 0"rjliZ4 4 — 1 , ! I , . I’1:’!''!!* t , '■r*-**' I" - '*-+ - t* **“rt*
* -|—* - - 4 - ! ^ — t - . . ' i 1 « i ■ »f i >u.—|*. +*it. u* _ |u .^4- . ..|.a i p. 4 -
t r~l- ■t- 4
Jrtr4:
4 •H ■
’T■ * TTT i t -
4 -4- .44i> Ur j— i)<i
-■-’— +- .- I ■ * r-y * r* - * r * - • T { • ■ - - • , ■ - - 4 - - -+ —,-4-+ - —.|- ‘ t r--.— j-+- *'4 yU4-.-. ■■-- +-U."*-T"' •-*
v tTTtrt t" LiLitii*:Mi
3 ^ . ; 4 0
ui_
aio»
96
r a m i t e in F ig u re No. 1J e re rep re sen ted by th e follow ing
equation©:
u f - / / .& /o j/a y f - 4 - 2
~ 7 *> S - ' ■ * (a6J
and
e /+ * 4 . 4 U jto y + / 3 - 9
g + '5 -5' (gp)
I n F igu re No* 14, th e Base e o r l o f p lo t was mad® fo r Annulus
No* % and th® .equation expressing th o se r e s u l t s la s
u * - / £ / < y / o -<*• 7
(50 )
Moat o f theco de te rm ina tlone war® mad® w hile th® flow a t th®
p o in t o f o b se rv a tio n was i n s tream lin e motion, b u t non® o f th®
experim ental va lues corresponded to th e lam inar reg io n in whioh
u ^ * y ^ aeeordlng to Niteur&dse* On c lo se r exam ination o f t h i s4~ 4r e la t io n s h ip , however, i t i s seen th a t fo r u to equal y # I t
i s zteoeseary th a t th e lam inar la y e r be so th in th a t th e v e lo c ity
a t y i e oqual to th e d is ta n c e from th e boundary m u ltip lied by th e
v o lo e ity g ra d ie n t a t th e wall* For th e flow co n d itio n s In t h i s
work, th e th ic k n e ss o f th e lam inar lay e r was g re a te r th an t h i s
a t a l l tim es*
.
' + * * * t t
— rFIGURE NO. 141 von Kormnn
* ............ * I 1 1 ' “ * ■ i t- t I: ...............
> in sj a> © 0- r—i*t—i—t • t" ! mi "| '■ • iH"i|T"fr:vri:ri»!iTM
- - 4i ,
• •" ■ ' • • ■ ^ 4 - r i -4.. k . j .*4*4 t, - i ■ < , ♦ , - t . ■ « » 1 ‘
,..) . . u , . . . .
j . . 4 • - I .................
. . . , j . . . .
. 1 1 . . , . ll
1 1 1 . 1 1
- * • ' T - t
■ 1 ............ - ]•>•■■■ ' 1 ........ 1 •■■!■■ '
. . . ' 4 4 : i
. . . . . . . . . .. . .. i . .. .. : j
• 1 • •*•• •• •••.. ~ L,--.j---- .... . 4.
Velocity Distributibn far:An rruluis :i* f - + r- 1 * t I *-*-1 ' *■■■ • ‘ ■ H*-*.
, , . L. j.«a. . , . 4 i-i -.4 44 .■F«.*.-v
4_..; . - i .
m Tir*<tr
-r - 4*fv* 4*4
a.-T
■fr
ftrr
I . . . i . ,
-20-—
*' UoM Observed*' :....................... ’ ^ ..J . 4 ►.
; Velocity D istribution o t ;N ^ -9 6 jO
rwlkurodse’s Valued Experim ental
■ t
f . . . . . 4- ^ - : j . . . i f . . . , -----
3 E H H
CJi
- - 1 ’ -$► -40 20 sp :::ir^ (c u 3
N lkuradse’e ex p ress io n fo r th e b u ffe r layer ie*
U f - / / ^ % /0 <j 3 . o,j5"
( 15)
aad f a r th e tu rb u le n t p o rtio n
U r ~ —>• /&).\ o ^(1<S)
S ince h ie v a lu es wore ob tained a t extrem ely high Reynolds Numbers
fo r flow in o iro u la r pipes* i t was expected th a t th e re would be
b o me d if fe re n o e In N ik u rad se 's va lues and th o b o ob tained in t h le
work w ith flew o f low Reynold® Humbere in a n m li*
C* O r i t le a l V alues.
The c r i t i c a l flow co n d itio n s were ob tained a t varioue p o e itio n e
w ith in each aaaulus* and th e r e e u l te o f th e se f in d in g s a re p resen ted
i n T ables V, VI* end V II. In T ables V-a* V I-a, and VII~a th e va lues
a re p resen ted fo r th e l a s t observed s tream lin e flow conditions* and
in T ables V-b* VI-b* and V ll-b th e va lues fo r th e f i r s t observed
tu rb u le n t flow c o n d itio n s a re presented*
When th e c r i t i c a l v a lu es o f (pg ~ wer e p lo tte d a t th e
a p p ro p r ia te p o s it io n s in th e annul!* expressed as th e rad iu s o f th e
p o in t from th e c en te r o f th e core* th e curves In F igures 15* 16 and
17 re su lte d * There was co n sid erab le sc a tte r in g o f p o in ts In th e se
f ig u re s and no r e a l c o r re la t io n was obtained* Several g en era l ob
se rv a tio n s could be made on th e b a s is o f th ese curves* however*
Basalts for Aanulns Bo. 1 Points lnslds r„ , last obsorTtd streamline flow conditions
59
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I l t t l so, uBasalts fo r Mumlw* Ho. 1
Point s out old# of t9§x • la s t ©bssrrsd s tr s s a lla s flow ooudltlouo
S ailas ofr o l s t , u .
Jf t .
Avar*gofa lae ltg rft./tO O .
y * io 5f t 2/» o a .
i ’ d i j l a s *«• f t l l i T d M ltf f t./M O . f t " 1
1.1*22 .0065 •7*1 .0979 .930 1180 .0468 5.170 33.6
1.1*00 .00*33 .720 .104 1.027 11*5 .0935 9.230 76.8.0*75 .940 1050 .05*5 6.180 51.5
1. 3*1 .00991 .666 .1016 1.027 1U 5 .082 2.070 80.0
1.360 .01166 .607 .112 .990 1275 .103 10,400 121.5.108 1.038 1170 .099 10,900 122.2.0*75 .9$* 10*0 .0794 8,250 96.4
1.325 .0146 .50* 4 0 6 1.004 1190 .125 12.490 1*7
1.320 .0150 .*195 .1265 1.003 1*20 .1292 12,620 189
1.295 .01708 .1*21* .1265 1.045 13«5 .139 13.360 228a o s 1.023 1190 .131 12.730 217.5
1.232 .0223 .250 .11*5 1.045 1274 .140 13.220 295.104 .97* 1200 .125 12,760 2*4.5.1205 1.092 1360 •13*5 13.5®J 302.1205 1.030 1320 .147 14,080 5 4
1.169 .0276 .0703 .1160 1.03 1295 .1342 13,000 359.114 1310 .139 14,199.108 1.01b 1200 .1351 13,280 366.5
1. 1*5 .0296 0 .0935 1.002 1050 .1 % 12.790 37*.0935 1.002 1050 .119 11,880 352.108 1.000 1210 .1328 13,260 392
ttS&S vo. ?-»
ft# s ti lts fo r tiw fln s Vo. 1 P o in ts in sld o » f i r s t ofc#«rr#4 tn fb n lo n t flow co n d itio n s
H atltu of i l l
y r ^ - r
V *1
Avarag.T i l N l i f f t . / i M .
V s 105f t ‘ /» e e . ^ V ^ i )V »*
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u . P a in t V elM ltjr f t . / « M . f t "1
.917 .00723 .707 .108 .990 1160 .089 8.800 78.9
.951 .01067 .601 .102 .990 1160 .090 8.900 9M
.973 .0125 .533 .1015 .935 1225 .llU 12,200 152.5
. 9** .0 l3 te .*•99 .1185 1.0>*5 1280 .102 10,500 if c
l.O lH .0159 .*•05 .1185 .978 1365 .13S 13.900 221
1.029 .01718 .358 .0975 .935 U 75 .119 12,690 a s
l.O l^ .0185 .308 .116.1185
1.03.990
12601350
.139
.13513.550I3.53O
251250.5
1.077 .02105 .2085 .12U5.108
. 9f f
.996l >»351225
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.12915,29012,1)00
319.5260.5
1.096 .02275 .1*195 .106 1.03 1160 .li(2 13,200 300.5
1.110 .0239 .1059 .1225.1285.l l6.1185
I .0 31.01
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13.900iu,6ooi **.950lU*500
3323*93583*?
«JittS s o . f - »
S m i t e t e r ta n g o s So. 1 Points outside of rM. » f i r s t observed turbulent flow send! t ions
S.dlU8 of »int* Is*
Hf t .
r - r ,
*2"T.
Averse*▼eleoityf t . / s e e .
V * i o 5f t* /* # * . y
« , P o in t V elocity f t . / o o c . fir1
l . t2 2 .0069 j n -------
i . to o . 008J3 .7» .110.0975
1.027. 9*10
12101170
.097
.0715 J ’pO79.563
1 . 3& .00991 .666 .106 1.02 1172 .081) 8.300 82. 1)
1.3*0 .01166 .607 .1189 . 9*3 1360 .109 11,080 129.5
.0915 . 9** 1090 .082 8,630 100.3
1.325 .011)6 .50* .112 1.003 1260 .132 13,000 195
1.320 .0150 . 1)95 .1305 1.003 1*70 .13* 13,200 19*
1.295 .01708 .1)21) .1305ail*1.0381.023
11)201255
. 1^9
.135ll),i)2013,220
21)6 .5226
1.232 .0223 .250 .1205.110.121)5.1225
1.03,97*
1.0021,030
1320127011)00131)0
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13.92013,1)60l i t , 220 ll),620
511300315326
1.169 .0276 .0703 .1275.1185.111)
1.03.9&
1.016 1270
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>412399321
1 .1^5 .0296 0 .0975.0975.110
1.0021.002
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TABUS KO. TI-B
Raaulta fo r Aumli» Vo* 2 Value* for f i r td oBoorrod turMLaat flow condition*
Hadlne a t F o la t, la .
yf t .
r - r_
*2-r»toreraceV elocityf t . /e e o .
V * io 5f*2/e e e .
*b Z“V Tm *
• V
U t Pwlftt V elocity f t./» e c * f t " 1
S t y
1.390 .00917 .79* .0820 .1(5 15*0
l .» 5 . 0179* .595 .0965 .886 1770 .0SB7 9.580 172
1.22 .0233* .*73 .093 .886 1710 .07*6 8 ,*20 19^.5
1.165 .0279 .370 .090 .880 1665 .0909 10,320 288
1.105 .03295 .258 .090 .875 1675 .096 10,980 362
1 . 0* .0383 .135 .0605 .835 1180
.9« .0*33 .0226 .0785 .865 1*80 .102 11,800 511
.97 .oWa .00
*■”*1
.<>€25
!0705
.8*5
• W
1205103012551280
.0775
.0807
.0926
9.0709.570
10,320
*00*22*55
.92 .0331 .108 .0625 .863 1175
.8 6 .02805 .2*3 .0870.0950
.875
.875l €201770
.0925
.10010,380 11,*20
296.5320
.78 .o a * .*22 .0655 .897 1190 .0833 9.280 198.5
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TAKJ VO, TXX-n
I n tu its fo r Aa&ului Vo* 3
Points outoido *Bax,« Inst oboorrod B trtw a lla t f lo v condition*
Badiu* of Point* in*
y« .
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M N l | i
ft./***.
-7-'1* 105
f t 8/*#*.< V V \ „ «, Point
T *loeitjr ft./*** .
u /-jJ
f t "1
i.Hoo .00833 .822 .1525 . 9ta 2910 .0595 6.320 52.6
1.560 .01166 .765 .lW *.1135
.966
. 9^8268021>*5
.0725
.05507,5005,800 67.6
1.320 .015 .698 .1523.1601
•9M.9®
28803120
.118•139
12 ,i*3015,100
186.5226.5
1.262 .01962 .601 .1H>*5 .930 2790 .123** 13,280 260
1.192 .0257 .*83 . 9*»«.958
25002705
.110
.12111,60012,620
298325
1.110 .0325 . 3*6 .1275. i *&5 :JS
21*302630
.130
.15613,80016.120
1*1(9525
1 . 0!»5 .0379 .2365 .l lH . 9*a 2175 .139 1U.7S0 560
.96U .0^3 .0738 .0900.0985
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.119
.12712,600ll*,l*0Q
5*a619
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. 95^
.97823702230
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tooolto for Aonalms Yo« 3 Potato inoldo r„ $ first ofeoorrod tor talent flow condition*
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Results for Annul us Ho. 3 Points outsld# r _ • f i r s t observed turbulsnt flow conditionsBOX.
Radius of Point* in.
yf t .
Average Velocity f t./se c .
r 1 io 3f t /••« .
{®2"®l^Vf(j n , Point Velocity ft./ooc . f t"1 ¥
1.1(00 .00*33 ,822 .1605 . 9W 3000 .0626 6,600 55
1.3*0 .01166 .765 .1523 .966 2800 .077»* 8,010 93.1290 . 9<* 21150 .0595 6,290 73,
1.320 .015 .698 .16s •9W 3160 .11138 13,200 228.168 .920 321*0 .11(2 15 , 1(1(0 232
1.262 .01962 .601 .1525 .930 2900 .1312 ll(,100 277
1.192 .0257 M l .1366 . 9>(* 2565 .1150 12,11(0 312.1525 . 95* 2810 .128 13.300 3U2
1.110 .0365 .31*6 .13*5 •9& 2285 .11(7 15,600 507.1H55 .966 2685 .160 lb ,500 537
1.0U5 .0379 .2365 .1 3 5 . 9*1 2285 . 1>*7 15,600 591
. 98U .0U3 . 073* .0950 . 9la 1800 .122 12,960 If7.1072 .881 2160 .137 15.550 669
.915 .01*88 .0185 .1305 .95*1 2U25 . i p 17,800 S69.121(5 , 97« 2260 .161 l6,l*00 801
CNOo
tical Average Reynold s Numbers I in Annulus Nal
al PointsNO. 15-OrFIGURE
O La9t Observed Streamlinie Flow
• First Oosurved Turbulenl Flow
°\>a
!3 08 2 3 1.20- m ax
RadLusLai RointT in
O L ost Observed Sitreomlioej Flow
• F irs t Observed Turbulent Flow
2 0
R o d iu a _ o f Pointy u l_
Numbers ot Pointsticol Averope Reynold in Annulus No.2
FIGURE m Jfir_Cr.
71
:
: i rlGU1 RE NO tiqal Pbints
A v q ra je Anhu
lo w s N u n
-irstT 3403
8 0 €>
L4 0 0
Rad us
72
In F igu re No* 15# th e s e c r i t i c a l value*® fo r Anm lua ft0* 1 a rc
p resen ted* In t h i s f ig u re th e re i s no c le a r d i f f e r e n t ia t io n between
th e c r i t i e a l v a lu es fo r each point# t h a t i e th e flow became tu rb u -
l e n t th roughou t th e p o r t io n o f th e annulus s tu d ied a t approxim ately
the same v a lu e o f (Dg * There was some In d ic a tio n
t h a t th e minimum c r i t i c a l v a lu e was ob ta ined a t th e p o in t o f maxi-
tau Telocity# a v a lu e o f ll^O* The r^nge o f c r i t i c a l v a lu es o f
th e Reynolds Number fo r th e 70$ o f th e annulus w idth covered in
t h i s in v e s t ig a t io n was from ll^O to 1J50*
In F igu re No* 16# th e c r i t i e a l v a lu es a t v a rio u s p o s it io n s in
Arsaulua No* 2 a re presented* In t h i s s e c tio n th e minimum c r i t i c a l
Reynolds Number was observed approxim ately a t th e p o in t o f maximum
v e lo c ity * C r i t i c a l v a lu es in t h i s s e c tio n ranged from 14^0 to
1700 fo r th e co n te r y?% o f th e annulus in v e s tig a te d * Turbulence
was f i r s t observed a t th e p o in t o f maximum v e lo c ity and as th e
flew r a t e was increased# t h i s tu rb u le n ce spread toward th e w a lls
u n t i l th e flow a t p o in ts near th e w a lls became tu rb u len t*
The most thorough In v e s t ig a tio n was made o f Annulus No» 5
and th e r e s u l t s ob ta ined w ith t h i s se c tio n o re p resen ted in
F ig u re No* 17* These r e s u l t s in d ic a te d th a t th e ;ninlmum c r i t i c a l
v a lu e o f th e Reynolds Number d id not occur a t th e p o in t o f maximum
v e lo c ity # b u t occurred a t a p o in t approxim ately 0 .25 inch relieved
toward th e co re w all from th e p o in t o f oaxinttm ve lo c ity * Approx?*
ia a te ly of th e annulus w idth was covered in t h i s in v e s tig a tio n
and th e rang© o f th e c r i t i c a l Reynolds Numbers over th ic w idth was
79
f3roa to 9900* The c r i t i c a l va lu es in d ic a te d on th e g la s s
w e ll wore o b ta in ed by tu rn in g th e dye tube so t h a t th e dye w a s
in je c te d d i r e c t ly on th e g la s s and th e flow was i nor eased u n t i l
s tre a m lin e flow no longer ex is ted* The p o s it io n o f th e observed
stream wee Indeterm inate# b u t i t was approxim ately a t th e
w ell*
V alues o f were ob ta ined fo r each p o in t by
assuming t h a t th e c r i t i c a l va lue lay halfway between th e va lu es
f a r th e l a s t observed s tre am lin e flow and th e f i r s t observed
tu rb u len t flew cond itions# and th e s e were th en p lo tte d a g a in s t
position In th e axxnuli* F igu res 16# 19# and 20 re su lte d * There
did n e t seem to be a very good c o r re la t io n in these* I f th e
Indicated curves were e x tra p o la te d to th e wall# t h i s should
give th e v a lu e o f C u / V J ^ j ^ a t which th e com plete se c tio n
would be In tu rb u le n t flew* A ctua lly th e re w il l always be a
la y e r on th e w all which does n o t move# u n le s s s l ip occurs# so
t h i s v a lu e w i l l have to apply to a p o in t a d i f f e r e n t i a l d is ta n c e
away from th e boundary* From th e p lo ts o f th e se c r i t i c a l v a lu es
a g a in s t th e d is ta n c e from a w all on re c ta n g u la r coordinates# i t
was found th a t th e v a lu es ob ta ined by e x tra p o la tio n o f th e curves
to y ® 0 were p o s i t iv e fo r Annuli 2 and 9# bu t t h i s value fo r
Anoulus no* 1 was negative* P lo ttin g o f th e c r i t i c a l va lues fo r
A nm lus Ko* 3 was t r i e d on rec tan g u lar# lo g arith m ic and semi-
lo g a rith m ic co o rd in a te systems# b u t in a l l systems th© values
e s ta b lis h e d a curve and e x tra p o la tio n o f th ese curves could no t
be done w ithou t in tro d u c in g erro r*
74
VgluoSqf M/if at; Poirits Annulus No. I :
P o in ts Oiutside ' r (max
p o in t s In s l iM % 0J(
75
EKUBE MO. LSi (irliicc I PointsAnnuls
10,00 0
4>_ _ .P o ih K Qwt£ixLe_ I max—# P o in t s ' lnsiideN rmax
76
FIGURE NQ Vqlufes o f in :Annulus No. 3
10,000
O Points • P o in ts
TSS
► ^ i -r + ~ pII I , I !
+ n rrtt“- i m ;
& «m m ties i of
i~; u i i t ; :I 4 4-+ -* !■
f- H • f-
W
I t+i H -
**--4 -*—4—t- «~f *
k i m i i t i s
, | |_pi4
m & m• lArinO lus A . Annuiui
— IrCfcOOO rvnul u s
IO:OQG
5 ;Q0 0
1
FIGURE N 0 .22 - Critical Values of 4^ of Pointsin Annuli I S 3
19
To o o rre c t fo r p o tltlo A i th e c r i t i c a l r a t io s o f u /y wero
n w lt ip l ie d by y# converting th e s e v a lu es in to c r i t i c a l va lues
o f a Reynolds Number* in t h i a ease a p o in t Reynolds Number*
L ogarithm ic p lo ta ware made o f th e se p o in t c r i t i c a l Reynolds
a g a in e t th e d ia ta n e e from a w all and a re shown in
25* 24 and 25* R e su lts o f th e se p lo ts showed th a t p o in t
o r i t i e a l Reynolds Numbers could be expressed as fu n c tio n s o f
th e d is ta n c e from a boundary a s i
fo r Annulus No* 1* (yu/V )e r^ # = <59#000 y**^5 ( 51)
f o r A m ilu s No* 2, ( ^ w V ^ e r i t £ 15*710 y 1*12 (52)
aa4 fop Anmlaa So. J , (y w /V ) e r l t = 57.700 y 1* ^ (5 5 )
The c o n s ta n ts in th e se equations were ob tained by th e method o f
l e a s t squares* At f i r s t se p a ra te equa tions were determ ined fo r
th e p o in ts In th e se c tio n which lay between th e p o in t o f maximum
v e lo c ity and th e g la s s w all and fo r th e p o in ts which lay between
th e p o in t o f maximum v e lo c ity and th e so re wall* bu t In S ec tions
1 and 5» i t was found th a t th e se equations were very n early th e
same* Therefore* a l l o f th e va lues were used to o b ta in th e b e s t
l i n e through th e values*
These f in d in g s a re s ig n i f ic a n t In th a t they may be used to
determ ine th e th io k n esc o f th e lam inar lay e r fo r oond itions in
which t h i s la y e r i s aliaoet d i f f e r e n t i a l in th ickness* I f th e se
equations can be app lied to th e flow cond itions in which t h i s
d i f f e r e n t i a l th ic k n e ss i s p resen t, th en th e th ick n ess can be
c a lc u la te d i f th e p ressu re drop due to f r i c t io n i s known* This
80
FIGURE NO. 2 3 ~ Critical Point Reynolds Number as a Functionof Position in Annulus No.I
3 4 5 8 7 8 3 'I©y , f t .
81FIGURE NO. 2 4 “ Critical Point Reynolds Number as a Function
of Position in Annulus No.2
FIGURE NO. 25-Critical Point Reynolds Number as a Functionof Position in Annulus No.3
85
may be i l lu s tr a te d as fellows*
l a th is laminar lay e r, i t la assumed th a t the velocity a t
a point la given by u » y(dn/dy)y g For the genera l ease# th e o r i t l e a l value o f the point Reynolds Kumber w ill be g iven
( y « / y * A y n ( 54)
te b a ti tu tin g and sim plifying,
ya-n s A ^ / ( i n / i , )y • 0 ( 59)
Aa long as a lan inar layer ex la ta , the shear s tre ss a t the outer
v a i l i s given aa,
■a - rJ )^ ( W J r L * A p (" z~ y ^ 2 L Ra (5«)
Solving fo r (4u/djr)gj ,
(du/dy) _ s ^(57)
S u b s t itu t io n o f E quation 57 in Equation 555 g iv e s ,
_2~n _ g ' V R2“ 4 r e (
s /) /c f ig y
A | - E ( V “ ? ) ( 56)
Bquetion (58} w il l epply only i f Equation® ( 51) * (55 ) apply to
th e s e a t ions when th e flow reechos th e condition® in which th e
la y e r in s tre am lin e flow i s d i f f e r e n t i a l in th idcnoss*
Rouse* s s t a b i l i t y param eter, , was evaluated fo r th e
c r i t i e a l flow c o n d itio n s in Annulus ^o* 1 and th ese r e s u l t s a re
84
p resen ted I n F igure No* 26* In th ie f ig u re th e value o f jL was
p lo tte d a g a in s t p o s i t io n in th e pipe expressed as d is ta n c e from
a w all* The c r i t i c a l v a lu e o f t h i s param eter was not co n stan t
i n a s e c t io n and th e h ig h e s t va lues o f i t were not ob tained a t
th e p o s it io n s in which tu rb u len ce was f i r s t d e te s ted ) th e re fo re ,
i t s u se as a s t a b i l i t y param eter does no t seem appropria te* I t
was n o t p o s s ib le to e v a lu a te t h i s param eter a t e i th e r th e p o in t
o f "tffyiisum v e lo c ity o r a t th e w a lls , s in ce th e v a lu e a t both o f
th e s e p o in ts was n e o e ssa r ily z e ro . The maximum value o f ^ was
found to occur a t approxim ately th e same p o in t a s was p red ic ted
by th e u se o f th e s tream lin e flow re la tio n sh ip s* d l l in a l l ,
i s n o t considered a p p ro p ria te fo r u se in t h i s app lloa tion*
85
d \jaliie$ cf X of Poir in Anqulps No.f j ]
FIGURElNO. |26 " |Cifiti
4 0 0
1----50]
OKAiTKR V
CONCLUSIONS k m BKOOMI SJSiliATIOi S
Based on t h i s work* th e fo llow ing conclusions worn drawn*
(1 ) fho t r a n s i t i o n from s tre am lin e to tu rb u le n t flow In
on a n n ilu i occurred In euoh a manner th a t p o rt o f th e f lu id
rem ained in e t r e a a l ln e m otion w hile th e rem ainder o f th e f lu id
became tu rb u le n t* Thie tu rb u len ce o r ig in a te d a t th e p o in t o f
maxims* v e lo c ity f o r two o f th e e ee tlo n e tooted# b u t fo r
Annulus No* 5* i t o r ig in a te d a t a p o in t removed approxim ately
0*25 in ch toward th e eo re from th e p o in t o f maximum ve lo c ity *
The amount o f f lu id which remain* s tre am lin e was decreased as
th e flew r a t e was ino reased and f i n a l ly a flow r a t e was reached
a t which th e flow i n th e e n t i r e section# except fo r a very em ail
amount near th e w alls# was tu rb u len t*
( 2 ) T h is t r a n s i t i o n f i r s t m anifested i t s e l f by im parting
a wavy m otion to th e f lu id * At f i r s t t h i s motion was a slow
s im o u e motion# bu t i t s wave len g th decreased as th e flow r a t e
was increased u n t i l a fu r th e r in c re a se in flow r a t e r e s u l te d in
irregu l® 1* w iggles and tu rb u le n t bu rsts*
(5 ) The minimum c r i t i c a l Reynold* Number# (Dg - D1 ) Vavfi>»
v a rie d w ith th e width o f th e annulus# In t h i s InveeS ga tiO tt I t
was found th a t t h i s va lue wae lower fo r th e wider an rn li*
Table V III p re se n ts a summary o f th e se findings*
66
87
TABUS n x I
Summary o f C r i t i c a l Reynold* Numbera
AnzulueNumber
V » iin ch es
Minimum O r i t lc a l Reynolde Number
Range o f O r i t le a l Reynolds Numbers
% o f Width o f Annulus S tudied
1 1. 55* 1150 U 50-1250 70
2 1 .955 1450 1450-1700 55
5 2.156 1*50 1450-5500 85
The le n g th o f th e t r a n s i t i o n reg io n was eeen to vary w ith th e w idth
o f th e ammlus* also* The wider annulus had th e la rg e r range o f
Reynolds lumbers b e fo re a l l o f th e flew in th e s e c tio n was tu rb u len t*
(A) The c r i t i c a l v a lu e o f th e p o in t Reynolds Number* y u /-!^ *
was found to vary w ith p o s it io n in a g iven annulue and t h i s v a r ia
t io n was expressed as*
fo r Anmilus No* 1 ^ ^ ^ ^ e r i t ~
fo r Annulus No* 2 (y u /V ) oy^ ~ 15# 710
fo r Annulus No* 5 ^ T ^ ^ J e r i t S 57*7^0
The s ig n if io a n e e o f th e se f in d in g s l i e s in t h e i r a p p lic a tio n
to o b ta in th e th ic k n e ss o f th e lam inar "file** a t high r a te s o f
flow in th e s e c tio n s . I t w ill be necessary to o b ta in p re ssu re
drop measurements however* before th e s e th ick n esses can be oal—
culated*
67
TABLE V III
^amraary o f C r i t i c a l Reynolds Numbers
AnnulusNumber
V ® iinches
Minimum Oritical Reynolds Humber
Range of C ritical Reynolds Numbers
% of Width of Annulus Studied
1 1. 55* 1150 1150-1550 70
2 1 .955 1*50 1*50-1700 55
5 2*156 1^50 1*50-5300 85
The le n g th o f th e t r a n e i t io n reg io n was seen to vary w ith th e w idth
o f th e e n m lu i i a lso* The wider annulus had th e la rg e r range o f
Reynolds lumbers b e fo re a l l o f th e flow in th e aeo tio n was tu rb u len t*
(* ) The c r i t i c a l v a lu e o f th e p o in t Reynolds Number, yWV^ $
vac fbund to vary w ith p o s it io n in a g iven annulue and t h i s v a r ia
t io n was expressed a s ,
fo r Annulus No# 1 ^ ^ ^ ^ c r l t * JT*#^
fo r Anmlue No# 2 ^ o r i i * y l* l2
fo r Annulus No# 3 ^ jn a /^ ^ c r i t s 57#7G°
The e ig n if ie a n c e o f th e se f in d in g s l i e s in t h e i r a p p lic a tio n
to o b ta in th e th ic k n e ss o f th e lam inar "film* a t h igh r a te s o f
flow in th e s e c t io n s . I t w il l be necessary to o b ta in p re ssu re
drop measurements however, befo re th e se th ick n esses can be Cal
culated#
88
( 5 ) T his method o f v is u a l o b se rv a tio n has many advantages
ever e th e r methods fo r determ ining c r i t i c a l flow co n d itio n s In
any ty p e o f flow emotion* I t p re se n ts th e only d i r e c t method
o f d e te rmi ni ng th e amount o f a f lu id stream which e x is ts in
tu rb u le n t flow* The method o f d e te rm ln ir^ v e lo c i t i e s l a e n tire *
ly s u i ta b le as long as th e f lu id rem ains I n s tre am lin e flow* but
can only be used to e b ta la maximum v e lo c i t i e s fo r th e p o rtio n
e f th e f lu id whieh i s i n tu rb u le n t flow*
(6 ) I t was concluded t h a t th e s t a b i l i t y param eter p resen ted
by House was n o t s u i ta b le to determ ine th e p o s it io n a t which
tu rb u le n c e would f i r s t appear in a section*
I t i s recommended t h a t fu r th e r study be made e f t h i s problem*
w ith p a r t ic u la r eiaphaela on th e e f f e c t e f roughness on th e c r i t i c a l
flow c o n d itio n s . I f a s u i ta b le sderoaanem eter were constructed*
i t would be p o s s ib le to o b ta in th e p re ssu re drop along w ith th e
v is u a l d e te rm in a tio n s and thus* more comprehensive d a ta would be
o b ta in e d . T his would a id In comparison o f th e w all shearing
s t r e s s e s as c a lc u la te d from th e v e lo c ity g ra d ie n ts and as ob ta ined
from th e p re s su re drop m easurements.
I f i t i s possib le* i t would be in te r e s t in g to arrange th e
system fo r th e use o f a more v iscous f lu id than w ater. This could
be done by i n s t a l l a t i o n o f a pump to r e tu rn th e f lu id to th e head
tsxdc. Blnee th e re a re now a v a ila b le commercial products which
can be d isso lv ed In sm all q u a n t i t ie s in water to in c re ase th e
v is c o s i ty g re a t ly , t h i s should be p o s s ib le .
APPENDIX I
BIBLIOGRAPHY
R eferenceNumber
1 A therton , D* H*f F lu id Flow in P ipes o f AnnularCross S ec tio n , T ran sac tio n s o f th e Amor loan 8«ol« iy « f M>ch»nleal Engln<>«rBT*xtV III.1*5-162 U 92ST.
2 B ardsley , C larence Edward, H is to r ic a l Resume o f th eDevelopment o f th e Science o f ^ y d rau liee , Oklahoma A H College* P i v is io n o f Engineer" ing P u b lic a tio n s , P u b lica tio n Ho* 59* IX* l A p r i l l ? ^ ) *
5 Becker, E ra s t , Stromungsrorgange in ringform lgenA palten ( la b y rin th d lo h tu n g en ), S e i te c h r l f t dee Y orelnee deuteoher Ingonlaura* £ l ,11 l y i i h i (1907)*
4 B lae iue , H» * Phyalkallaohe Z e ita c h rif t* XXI, 1175 ( 1911)<
5 B inn ie , A. M * , A D ouble-R efractive Method o f DeterminingTurbulence in L iqu id s, Proceedings o f ifo P hysica l Society ( London)* Lvil* wO^HSz
6 B innie, A* M«, and Bowen, E* J* , A Method fo r MakingS tream lines Momentarily V is ib le , Proceedings o f th e Cambridge P h ilo soph ica l Society*XXXVII, 4 5^457 (lp jfl)*
7 Bond, W. N ., T urbulen t Flow through P ip es, Proceedingeo f th e Physical Society (London), XLIII-1S3- ? ? (1951).
8 Brown, George G*, and A sso c ia te s , U nit O perations,John Wiley and Sons, Ino*, Now York, 19?0 *Pp* x i i / 611*
9 C aldw ell, J* , Jou rna l o f th e Royal Technical C ollege( G lasgow ),~ I I , 265 ( 1950)•
10 C arpen ter, F* G*, Colburn, A* P*, Schoenborn, E. M«,and W urster, A*, Heet T ransfer and th eF r ic t io n o f Water in an Annular Spaoe, T ran sac tio n s o f th e American I n s t i tu t e of Chemical 'E ngineers, XLII, 1$5“ 1®7 ( 1940/7
89
90
Refer©*©#^Washer
11
12
1?
14
15
16
1?
16
19
20
Cornish# R. j»# R trbuU nt Flow through Fine Eccentric
* s o a a u m w R M i wDelssler# Robert <$«# Analytical and Experimental
Investigation of Adiabatic Turbulent Flowin hwtk jgaugaU.ableac asmiuss
Fage# R* and Townend# H# 0* H## An Examination of Turbulent Flow with an Ullra^Mlefoeoope#
Soeletar at £ojgefi,
Fea*el# Thomoo A«t Visual Observation©f C ritical Reynold© Somber* in Shapes other than Oirouler, M.8.Tb»»l». LwrtgUn* Stoti OntT»r«lty, l w *
Gibson# A. H*# The Breakdown of Streamline Motion a t the Higher C rltloal Velocity in Pipes of Circular Croce Section# Philosophicals£ Ig M te'OT»
Rllnkenberg# A. and Mbey# H* H«» Dlmenslonles* Groups In Fluid Friction# Heat and Material Tramfwr, OhwAoal E nglaw lm Pr.SS.ttta*3 JY , 17- j i t ( 19W ).
Knudsen# Jernes G.# Heat Transfer# Friction and Velocity Gradients in Anmll Containing Plain and f lu Tuba** Pht-Bt tha»l»* »nl<ror«ity of Michigan# 1949*
Knud sen# J* G.# and Kate# Donald L.# Heat Transfer and Pressure Drop In Annul!# Chemical Engineering Progress# XLVI# tyQ^^dt}, (1950) •
Kratz# A. p## Maclntir©# H* J.# and Gould# R* Flew ©f Liquids In Pipes of Circular and Annular Croee-Sectiona# University of I llin o is#Engineeri m Experiment S ta tio n Bulletin8oT 222 ( 193l 7 o
91
R®f®r dumber
*»«**# Rwaw, Hydrodynamics, Sixth Edition, Cambridge University Prose, London, wr ^ 7Jft (1932)*
28 Lea, F# 0* and Tadroe, A* 0*, Flow o f Water through ftCircular Tub* with ft Control Cor® and through Rectangular Tubes, Philosophical Mftgasjn® (7)o XI#
25 Lonodal®, Thoaftl# Th® Flow of Water 1ft th® AnnularSpeoe between two Coaxial Cylindrical5 K fc JW ? ‘ SSl m $*&*£ <*)• XLVI,
24 Maurer, Edvard# Dio fcrltisch® Roynoldssehe Zahl furKrelarefere naoh dem Entropiepr insip,Zoltoohrlft fu r Physlk, o x m , 5^2- J2 ( 19*9 )*
25 Millar, Benjamin, 9ho Lead nftr~Film Hypothesis, Trane*ftg^loag &g J&2 jmgrleag ^olgtg o£ jfega&a&2&£B t i s s m t t h m i W J l p W h
26 Palmer, Louie Qftlvin, M« J g BSSSli MaUI&gS .SfeSlgPmftvorolty, 1939*
27 Pi«roy# H* A, Y*, Hooper# M* ft*, and dinar, H* F«,Viscous Flow through Pipes w ith Ceres,Philosophical dftgaaino and Journal of MfiAmse* i? , 7th s«rl®«# 769-7®3Tl933)*
28 RothfUe, Robert R«, V e loc ity D is tr ib u tio n and F lu idF r ic t io n In C oncentric Annul!, fte* D* th e C arnegie I n o t 1 tu t® o f Technology, JUn® ly
29 R othfue, Robert R*, Menrad, 0 . C«, and B®n®oal, V* E*,V e lo c ity D is tr ib u tio n and F lu id F r ic t io n In Smooth C oncentric Annul1,and E ngineering Chanda t r y , X t l l , a jjll*
Reynold#, Osborn®, An Experimental In v e s tig a tio n o f th e Circumatancee Which Determine Whether th e Motion o f Water Shell Be D irec t o r S inuous, and o f th e Law o f R esistance in P a r a l le l Channels, ihl.loftOPhl.fial pranftaotio n j o f th e Royal Society o f London, CLXHY, ( I f
92
H eferea&ee N eater
Jk Route, Hunter, glementary Mechanics o f Fluids* JohnWiley and Sen#, Wow fo rk , W T jT? / x li*
32 B o h lio h tin g , R«* Boundary ta y a r Theory*Adeleery Oottffldtioo foi n ie a l
Of Apr!
35 SahMokanborg, S ., Z e lta a h r in t e m w i f t i Mrfchamatlksad aaahw&k, h i . a ^ ir d g i; ! .
3* S taatoa* T»S*» and Pannell* J . P ., S im ila r ity o f MotionIn R e la tio n o f th e Surfaeo P r lo t io n o f P lu id o t FhU oeophleal T ran aae tlo n t o f th e Royal Sooloty o f hondotu A CiCXIV* 1 ^ *
55 you Karaan, Th+, Turbulence and Skin Fr lo t io n , Jou rnalo f A eronau tica l Splonoo, I# 1-20 ( lp jS K
56 tfleg&nd* J* H« and Baker* S . M*, T ransfe r Preeeeeeain Annul!* T ranaaotlona o f th e AmericanIn a tita te o f 'p fg & a a l ' f x m i l *‘j & J j M C jP b T T ^
37 Winkal, S ., ZattMfcrlft f ^ angwndte K>tfeaa»t.ife £*&Moohanlk, I I I* 2pl
56 Zerban* Alexander H*, Fh» D* Theolt» U n iv e rs ity o j
APPENDIX I I
NOMENCLATURE
Sy®hol D e fin itio n Dimension*
A C onstent
C C onstant —-
D Diameter o f Pipe L
f F r ic t io n f a c to r ——
g G ra v ita tio n a l constan t L/T^
C Maoe flow r a t e M/LT^
H V eloc ity head, V^/gg L
J T ranefor f a c to r
L Length, p a r a l le l to flow L
1 Mixing le n g th L
r Radius o f p o in t, v a r ia b le L
Vaax Radius o f p o in t o f maximum L▼ eloeity
R Radius o f w a ll, c o n stan t L
R^ H ydraulic ra d iu s L
u P o in t T e lo c ity L/T
V V e lo c ity , u su a lly average L/T
w Weight r a t e o f flow M/T
y D istance from a boundary L
F r ic t io n lo s s per fo o t o f p ipe L/LL
95
94
Symbol D e f in itio n Dimension!
A pL
P ressu re l e s s per fo o t o f p ipe f/\?
P D ensity o f f lu id m/ i ?
/* A bsolute v is so c i ty o f f lu id m/ lt
V Kinem atic v is c o s i ty o f f lu id Ls/T
n Sddy v is c o s i ty M/LT
'T Shear S tre s s M/LS
S ubscrip t*
1 Refer* to eore w all
2 R efers to ja c k e t w all
9 o r wbjl* maximum value
avg* average value
o r i t* c r i t i c a l va lue
APPENDIX I I I
Bey to Colson Barbers in tab les of Beta
Colson ItemM i r
1 Badius o f o b se rv a tio n p o in t . Inches fro o c e n te rl i n e of
2 T e lo o ity a t p o in t of observation* f t . / s e c .
3 Average v e lo c ity in th e section* f t . / s e c .
h Bemarks* flev descriptionSL — streataHne to * b .- tnrbalent
5 Beynolds Vhaber* based on average v e lo c ity andV ° i
6 B a tlo o f p o in t v e lo c ity to average v e lo c ity
95
96
112—
0.917
0.951
0.973
0 .9 * *
1 .0 1 *
1 .089
l .o *(5
1 .0*5
1.077
DASA
m m a a no. 1
1 f t ............0 ? ................ B*___________ <1> <s>.0872.0975. lo t
.07*17 .0878
.o n o .0975— .102
.0839
.0973
.106
.107
.11*
A.0895-0955.1015
.0781 .0995
.09** .110 .1185
.125 .110
.198 .1185
.10*0 .0
.112 .0912
.11** .0975
.113 .0975
.1282 .10*1
.1332 .11*5
.135 .1185
.1153 .108
.102 .112
.130 .11*
.139 .11®
.098 .079
.100 .023
.103 .0895
.112 .0955
.119 .102
.1 0 .10$
.1*78 .1185
.1*9 .12*5
SISID iffusing
97211101192
.682
.832
SI91D iffusing
9871U01138
.868
.8*2
SI8181810 •IttUBtt* D iffusing
1080U H1230
I .0681.1151.119
1,12
8181D iffusing
106211901283
.786
.858tm
SIfus%«
12$01370
1.115i .lw
SISISIfurb*
8*8102*1100H75
1,2221.221.2291.222
8L» slxmous91SITurb.
11081180127513*5
l.lS1.831.181.1*
SLSL, sinuous 91Turb.
1180123$12511277
1.071.1**1.1*1.198
11 is
ii
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VITA
Thomas Anderson Fe&ael wee born Juno 17# 19&% i n D allas#
Teams* Ho moved to West knroe* Louisiana* and a ttended p u b lic
schoo ls in Monroo and West Monroof g raduating from Ou&ehlla
P a r i oh High School in 1940* Ho a tten d od Harvard Oollege on a
sc h o la rsh ip fo r th e 19401941 school year and then en te red
L ouisiana ro ly toohn io I n s t i t u t e in 1941. In 1944 ho wee d ra f te d
In to th e Amy and spen t to o y e a rs in th e serv ice* fo r so re than
a yoar o f t h i s serv ice* ho was assigned to th e ^ n h a t ta n D is tr ic t*
Corps o f Snglneers In Oak ttidge* Tennessee and Los Alamos* 2?ew
Mexico* Following h is discharge* he re -e n te re d L ouisiana Poly**
te e h n ie I n s t i t u t e in 1946 and was graduated in May* 1947 w ith
th e degree o f Bachelor o f Science in Chemical Engineering*
Following g rad u a tio n , he was employed in th e Heseareh Department
o f P h i l l ip s Te tre leua: Company in B & rtlSeville* Oklahoma* u n t i l
February* 1946* a t vhieh tim e he en te red th e Graduate School o f
L ou isiana S ta te M nirersity* Since th a t tim e he has been employed
a s a Graduate A ss is ta n t in th e Department o f Chemical Engineering
and rece ived th e degree o f Master o f Science In August* 1949* At
th e p resen t tim e he I s a cand idate fo r th e degree o f Doctor o f
Philosophy*
1 15
EXAMINATION AND THESIS REPORT
Candidate: Thomas Anderson F eaze l
Major Field: Chemical E ngineering
Title of Thesis: A V isual In v e s tig a tio n of th e Appearance o f Turbulence in AnnularSpaces
Approved:
Major Professor and Chainrfan
Dean ofjttee Graduate School
EXAMINING COMMITTEE:
/ j/
Date of Exam ination:
May lU j 1951