Bubble Dynamics of Honey on a Vertical Column Using Video

Analysis

Cañaveral, Ronnie Jr., F.Mendoza, John Edrick B.

Primero, Roel John C.PHYS 192 S-1L

Co-author:Balista, Junius André F.

Bubble Dynamics – study concerning the

forces that cause motions of bubbles. Surfactant – surface-active agent Good Quality Honey – has low water content Terminal Velocity – the limit speed of a fluid

due to a restraining force from the medium of flow.

Definition of Terms

To provide a visual approach in determining

the characteristics of the bubbles rising in the pure honey in vertical column.

To determine whether there exists a terminal velocity

If there exists a terminal velocity, determine whether the terminal velocity is dependent on the bubble’s size.

To relate terminal velocity to quality of honey.

Objective

Liger-Belair, G. Uncorked: the science of

champagne. 2004. Princeton University Press, 41 William Street, Princeton, New Jersey 08540.

Based on the experiment conducted, the velocity of millimetric bubble released in ultrapure water increases as distance increases. Impure water with added protein resulted to decrease on bubble velocity because bubbles traps surfactants along its path.

Review of Related Literature

Sony DSC – W55 (7.3 MP) Digital Camera Tripod Honey (UPLB BioSci Bee Program) Light Source (Yellow Light) Microsoft Excel DataPoint Software

Materials

Methodology

Figure 1. Set-up including the camera and the pure honey and the background light

Figure 2.Bubbles in the honey inside a container

A

BC

Figure 3. Screenshot of the application used in video analysis with the data extracted

RESULTS

0 1 2 3 4 5 6 7 80

1

2

3

4

5

6

7

8

9

10

Time (s)

Velo

cit

y (

mm

/s)

0 1 2 3 4 5 6 7 80

2

4

6

8

10

12

Time (s)

Velo

cit

y (

mm

/s)

0 1 2 3 4 5 6 7 8 90

1

2

3

4

5

6

7

8

Time (s)

Velo

cit

y (

mm

/s)

Figure 4.Velocity (mm/s) versus Time (s) of the three bubbles

A B

C

RESULTS

Sample Terminal Velocity (mm/s)A 8.8 - 9.0B 9.8 - 9.9C 6.5 - 6.7

Table 1. Terminal Velocity of the three bubbles

DISCUSSION

The velocity of the bubbles inside the honey increases logarithmically with respect to time.

The terminal velocity of the smaller bubble is lower than that of the bigger bubble.

The bigger bubble covered a larger distance than that of the smaller bubble.

The obtained terminal velocity of bubbles in

the experiment were first-hand and no other literature have gathered data for a pure honey solution.

The terminal velocity of the bubble is dependent on its size.

The quality of the honey used as sample is not good.

CONCLUSION

It is recommended that the Stoke’s Law

formula for small bubbles, and Davies and Taylor for isolated large bubbles is used to calculate the exact terminal velocity of the bubbles.

RECOMMENDATION

Stoke’s Law Davies and Taylor

g =acceleration due to gravityde =bubble diameter (diameter of a sphere with the same volume as the bubble)µ1 =dynamic viscosity of liquidρl =density of liquidρg =density of gas.1

1. Terminal Velocity of a Bubble Rise in a Liquid

Column. Mário A. R. Talaia World Academy of Science, Engineering and Technology 28 2007

2. Uncorked Science of Champagne, Gerard Liger- Belair

3. http://www.benefits-of-honey.com/good-quality-honey.html. (Retrieved March 19, 2012)

4. http://www.translatorscafe.com/cafe/units-converter/typography/calculator/pixel-%28X%29-to-centimeter-%5Bcm%5D/. (Retrieved March 19, 2012)

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