DINAMICA DE PUENTES LIQUIDOS CASI INESTABLES

Experimental analysis of the breakage of a liquid bridge under microgravity conditionsI. Martnez, J.M. Perales

Universidad Politcnica de Madrid, Spain

COSPAR 2010

Thursday, 22nd July 2010

Spacelab-D2, Experiment STACO, Run 2

Experiment descriptionExperiment performed on board Spacelab D-2 (1993) with AFPM.Fluid used: silicone oil of n=10 cSt, r=920 kg/m3, s=0.020 N/m. Supports: two 30 mm in diameter circular coaxial disks made of aluminium black-anodized, with a 30 dove-tail cut back.Nominal shape: cylindrical liquid column with L=85 mm length.Diffuse white background illumination (98 leds).Ref.:Martnez, I., Perales, J.M., Meseguer, J., Stability of long liquid columns (SL-D2-FPM-STACO), in Scientific Results of the German Spacelab Mission D-2, Ed. Sahm, P.R., Keller, M.H., Schiewe, B, WPF, pp. 220-231, 1995.Martnez, I., http://webserver.dmt.upm.es/~isidoro/lc1/SL/ST2_118_13_30_41stretch_xvid.avi

Automated image edging

Stability diagram for unloaded liquid bridgesStretching evolution at constant volume from A to B

Experimental values (length, volume, stability)

Non-dimensionalizationUnit length Unit timeSlenderness Reduced slenderness Excess liquid volume

Column shapes and their stability (nondimensional)Equilibrium shapes with v