Effect of Heat Loss on Hydrothermal Wave Instability in Half-Zone Liquid Bridges of High Prandtl Number Fluid

DOI:10.15011//jasma.36.360204
Int. J. Microgravity Sci. Appl. 2019p360204
Author
S. FUJIMOTO, T. OGASAWARA, A. OTA, K. MOTEGI and I. UENO
Organization
Div. Mechanical Engineering, School of Science & Technology, Tokyo University of Science, Dept. Mechanical Engineering, Faculty of Science & Technology Tokyo University of Science, Research Institute for Science & Technology, Tokyo University of Science
Abstract
We investigate the effect of heat transfer through a free surface on the primary instability of thermocapillary-driven convection in a geometry of so-called half-zone liquid bridge of high Prandtl number fluid. The target liquid bridge is a straight whose aspect ratio T=H=R is mainly kept at 2:0, where H and R are the height and the radius of the bridge, respectively. We focus on the flow fields induced by the instability; it is found that the bifurcation diagram exhibits a significant difference between the cases of the Prandtl number Pr = 16 and 28. The effect of gravity level is also examined in order to discuss qualitatively the induced flow fields after the transition obtained in the ground-based experiments as well as in on-orbit experiments so-called ‘Dynamic Surf’ in the Japan Experiment Module ‘Kibo’ aboard the International Space Station.
Keyword(s)
Hydrothermal wave instability, Dynamic Surf, Half-zone liquid bridge, High Prandtl number fluid, Heat transfer
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Received 31 January 2019, Accepted 10 February 2019, Published 31 April 2019

© The Japan Society of Microgravity Applicaiton

この投稿文は次の言語で読めます: Japanese

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