Transition to chaotic thermocapillary convection in a half zone liquid bridge

•Microgravity experiments on the flow transitions in liquid bridge to chaotic flows.•Nonlinearity of the flows of the fluid of Pr>100 evaluated by chaos analysis.•Fully developed flows with long-enough relaxation time owing to the ISS. A series of fluid physics microgravity experiments with an en...

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Bibliographic Details
Published in:	International journal of heat and mass transfer Vol. 89; pp. 903 - 912
Main Authors:	Matsugase, Taiki, Ueno, Ichiro, Nishino, Koichi, Ohnishi, Mitsuru, Sakurai, Masato, Matsumoto, Satoshi, Kawamura, Hiroshi
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-10-2015
Subjects:	High Prandtl number International Space Station Liquid bridge Microgravity Thermocapillary convection Transition to chaos Transition to chaos Thermocapillary convection International Space Station Liquid bridge High Prandtl number Microgravity
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Summary:	•Microgravity experiments on the flow transitions in liquid bridge to chaotic flows.•Nonlinearity of the flows of the fluid of Pr>100 evaluated by chaos analysis.•Fully developed flows with long-enough relaxation time owing to the ISS. A series of fluid physics microgravity experiments with an enough long run time were performed in the “KIBO,” the Japanese Experiment Module aboard the International Space Station, to examine the transition to chaos of the thermocapillary convection in a half zone liquid bridge of silicone oil with a Prandtl number of 112. The temperature difference between the coaxial disks induced the thermocapillary-driven flow, and we experimentally demonstrated that the flow fields underwent a transition from steady flow to oscillatory flow, and finally to chaotic flow with increasing temperature difference. We obtained the surface temperature time series at the middle of the liquid bridge to quantitatively evaluate the transition process of the flow fields. By Fourier analysis, we further confirmed that the flow fields changed from a periodic, to a quasi-periodic, and finally to a chaotic state. The increasing nonlinearity with the development of the flow fields was confirmed by time-series chaos analysis. The determined Lyapunov exponent and the translation error indicated that the flow fields made transition to the chaotic field with the increasing temperature difference.
ISSN:	0017-9310 1879-2189
DOI:	10.1016/j.ijheatmasstransfer.2015.05.041