Abstract
Thermocapillary (or Marangoni) convection in a cylindrical liquid bridge and its transition to oscillatory and chaotic states has been stimulating strong interest among fluid dynamicist in the microgravity community. To clarify the mechanism of such a phenomenon, microgravity experiment will be carried out in the International Space Station (ISS) and several parameters (Dynamic Surface Deformation (DSD), temperature, mode structure, etc.) of liquid bridge will be measured. But g-jitter in ISS might have harmful influences on the measurement and thermocapillary flow. So, in this experiment, g-jitter is reproduced on the ground by using piezo-electric actuator (PZA) and feedback control system and DSD and flow pattern are observed. As the result, influence of g-jitter is removed by image processing and signal filter, and it is clarified that g-jitter has little effect on the mode structure. In addition, resonant frequencies of liquid bridge are observed and it has little probability that g-jitter causes sympathetic vibration of liquid bridge.
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