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Duarte, Laura

Gallardo, Beatriz

González Cinca, Ricardo

Maldonado, Oscar

English

UPCommons. Portal del coneixement obert de la UPC

ELGRA News, Vol. 26, September 2009 324 BUBBLES IN DIFFERENT LIQUIDS IN MICROGRAVITY AND OSCILLATING HIPERGRAVITY ENVIRONMENTS  Laura Duarte, Oscar Maldonado, Beatriu Gallardo Professor: Ricard González-Cinca Department of Applied Physics, UPC. Castelldefels (Barcelona), Spain.  We present experimental results on the behaviour of two-phase fluids (liquid and gas) in microgravity and hipergravity conditions. Experiments were carried out in the ESA’s REXUS (Rocket Experiments for University Students) Campaign. The experiment test cell consisted on four small cylindrical cavities containing different liquids and portion gas fractions. Liquids and gas fraction used are shown in Fig. 1. With this distribution, we are able to compare results on the behaviour of bubbles with different volume fraction, viscosity and surface tension. The experimental set-up (Fig. 3) surrounding the test cell consisted on systems for control, power regulation and data acquisition (the camera, mirror and illumination). When REXUS-V went into the microgravity phase, the air of the cavities formed a bubble into the liquid. During the rocket launch the experiment just stayed on stand-by, and after 73 seconds (when the low gravity phase started) the camera started recording. We obtained a video of about 8 minutes, which allows studying the behaviour of the different bubbles in microgravity (Fig. 4) and also in hipergravity, when the changes on the acceleration caused interesting effects on the bubbles. ELGRA News, Vol. 26, September 2009 325  

Bubbles in different liquids in microgravity and oscillating hipergravity environments

https://upcommons.upc.edu/bitstream/2117/9186/1/ricardElgra2.pdf

Bubbles in different liquids in microgravity and oscillating hipergravity environments

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