Abstract
This paper reports an overview and some important results of microgravity experiments called Dynamic Surf, which have been conducted on board the International Space Station from 2013 to 2016. The present project mainly focuses on the relations between the Marangoni instability in a high-Prandtl-number (Pr= 67 and 112) liquid bridge and the dynamic free surface deformation (DSD) as well as the interfacial heat transfer. The dynamic free surface deformations of large-scale liquid bridges (say, for diameters greater than 10 mm) are measured with good accuracy by an optical imaging technique. It is found that there are two causes of the dynamic free surface deformation in the present study: the first is the time-dependent flow behavior inside the liquid bridge due to the Marangoni instability, and the second is the external disturbance due to the residual acceleration of gravity, i.e., g-jitter. The axial distributions of DSD along the free surface are measured for several conditions. The critical parameters for the onset of oscillatory Marangoni convection are also measured for various aspect ratios (i.e., relative height to the diameter) of the liquid bridge and various thermal boundary conditions. The characteristics of DSD and the onset conditions of instability are discussed in this paper.
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Acknowledgments
The authors would like to thank the members of Dynamic Surf project for their contributions to this work. This study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI (Grant-in-Aid for Young Scientists (B), 16K18011, and Grant-in-Aid for Scientific Research (C), 17K06190).
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This article belongs to the Topical Collection: Interdisciplinary Science Challenges for Gravity Dependent Phenomena in Physical and Biological Systems
Guest Editors: Jens Hauslage, Ruth Hemmersbach, Valentina Shevtsova
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Yano, T., Nishino, K., Matsumoto, S. et al. Report on Microgravity Experiments of Dynamic Surface Deformation Effects on Marangoni Instability in High-Prandtl-Number Liquid Bridges. Microgravity Sci. Technol. 30, 599–610 (2018). https://doi.org/10.1007/s12217-018-9614-9
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DOI: https://doi.org/10.1007/s12217-018-9614-9