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Proceedings Paper

Transition in high Prandtl number buoyant-thermocapillary convection
Author(s): Bin Zhou; Li Duan; Liang Hu; Qi Kang
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Paper Abstract

Combined buoyant-thermocapillary convection in a rectangular vessel is experimentally studied for the 100cSt silicone oil with a large temperature-dependent Prandtl number (Pr=909 at 25°C). Utilizing the PIV and IRT techniques, the two-dimensional velocity fields in the mid-plane and the free surface temperature field are investigated. We have established the relationship between the total kinetic energy in the mid-plane and the imposed temperature difference for the first time through experiments. The well known return flow has been achieved and the first transition is observed from unicellular- to bicellular- flow at a much higher critical temperature difference relying on the layer depth. The transition conditions have also been transformed into a series of nondimensional parameters and mapped in the Ma-Bod and Ra-Bod spaces.

Paper Details

Date Published: 24 August 2009
PDF: 7 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751R (24 August 2009); doi: 10.1117/12.839071
Show Author Affiliations
Bin Zhou, Institute of Mechanics CAS (China)
Li Duan, Institute of Mechanics CAS (China)
Liang Hu, Institute of Mechanics CAS (China)
Qi Kang, Institute of Mechanics CAS (China)

Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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