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Experimental study of thermocapillary convection on a liquid bridge consisting of fluid with low Prandtl number in a floating half-zone |
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| Authors: | Zhiwei Sun Jinhu Han Lerong Dai Jingchang Xie Wenrui Hu |
| Affiliation: | 1. General Establishment of Space Science and Applications, Chinese Academy of Sciences, 100080, Beijing, China 2. Institute of Mechanics, Chinese Academy of Sciences, 100080, Beijing, China 3. Department of Chemistry, Peking University, 100871, Beijing, China 4. Institute of Mechanics, Chinese Academy of Sciences, 100080, Beijing, China |
| Abstract: | A device of mercury liquid bridge of floating half-zone is designed to experimentally explore thermo-capillary convection and its instability of a low Prandtl number liquid. Noncontacted diagnostic techniques were developed to monitor surface flow and surface deformation. The surface flow and the influence of a growing surface film (or skin) on the flow were observed It is shown that the film is a key factor in changing the behavior associated with the thermocapillary convection. The experiment indicates that the critical Marangoni number should be much higher than that expected by the numerical simulation. The condition and process of surface film growth are discussed. The surface oscillation of the mercury bridge wrapped with "dirt-film" was observed, and the characteristics and the frequency associated with this oscillation are given. |
| Keywords: | liquid bridge low Prandtl fluid microgravity thermocapillary convection. |
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