Non-desirable convective motion in microgravity experiments

Statistics – Applications

Scientific paper

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Spaceborne And Space Research Instruments, Apparatus, And Components, Astronomical And Space-Research Instrumentation, Thermodynamic Processes, Conduction, Convection, Equations Of State

Scientific paper

Residual gravity always exists at any space vehicle. The residual accelerations, which are taken into account in the calculations, correspond to the values of accelerations typical for an experiment on the satellite FOTON due to the atmospheric drag and the stabilizing rotation of the platform. The 3-D calculations give that the maximum velocity of the flow, arising due to residual gravity is varying in the limits 0.2-4.05*10-3 mm/s. The presence of a single bubble in the experimental cell can cause strong flow due to the Marangoni force acting on the gas-liquid interface. 3-D simulations have been done for a four different bubble models taking into account both effects: Marangoni and buoyancy. Analyzing the temperature distribution across the cell one can discover the nature of the deleterious flow. .

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