Abstract
An experimental investigation has been performed to study a supercritical flow driven by the combined effects of buoyancy and thermocapillary forces, in a non-isothermal liquid cylindrical column heated from above (liquid bridge). The liquid zone was of 3mm in radius and 2.58mm in height made of n-decane. Changing temperature of air in the experimental chamber via controlling the temperature at its external wall, the conditions at the onset of instability of the flow, as characterized by the critical value of the imposed temperature difference, were determined for several values of the liquid volume. Performing ”chaos analysis” of the obtained data, different regimes of the supercritical flow were identified. The experimental observations are supported by a computer modeling of the thermoconvective flow made for the experimental conditions neglecting deformations of the liquid-gas interface. It is shown that the spatial structure of the flow may change with external conditions in the ambient gas.
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Acknowledgments
The authors greatly appreciate the financial supports from the Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for Scientific Research (B) (the project no.: 21360101, 24360078). The author Takumi Watanabe would like to thank the Center for Promotion of Internationalization, Tokyo University of Science for the financial support of the international activities which allowed him to travel and to stay at the MRC, ULB. We would like to gratefully acknowledge the Belgian Science Policy Office, ESA-PRODEX program for supporting the Japanese-European Research Experiment on Marangoni Instability (JEREMI) for supporting the scientific collaboration between Japan and the European Union and for making it possible for students from Japan to come to Free University of Brussels to perform their projects.
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Watanabe, T., Melnikov, D.E., Matsugase, T. et al. The Stability of a Thermocapillary-Buoyant Flow in a Liquid Bridge with Heat Transfer Through the Interface. Microgravity Sci. Technol. 26, 17–28 (2014). https://doi.org/10.1007/s12217-014-9367-z
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DOI: https://doi.org/10.1007/s12217-014-9367-z