24 August 2009 Transition in high Prandtl number buoyant-thermocapillary convection
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Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73751R (2009) https://doi.org/10.1117/12.839071
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China
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.
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Bin Zhou, Li Duan, Liang Hu, Qi Kang, "Transition in high Prandtl number buoyant-thermocapillary convection", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751R (24 August 2009); doi: 10.1117/12.839071; https://doi.org/10.1117/12.839071
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