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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

THE THERMO-SOLUTAL CAPILLARY-BUOYANCY CONVENTION AT POSITIVE CAPILLARY RATIO IN A SHALLOW ANNULAR POOL

Lisheng Deng
Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development , Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, No.2, Nengyuan Rd. Wushan, Tianhe District, Guangzhou 510640, P.R. China

Jiechao Chen
Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development , Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, No.2, Nengyuan Rd. Wushan, Tianhe District, Guangzhou 510640, P.R. China; Key Laboratory of Distributed Energy Systems of Guangdong Province, Dongguan University of Technology, Dongguan 523808, China

Hongyu Huang
Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development , Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, No.2, Nengyuan Rd. Wushan, Tianhe District, Guangzhou 510640, P.R. China

Yourong Li
Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, College of Power Engineering, Chongqing University, Chongqing 400044, China

Jia-Jia Yu
Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, College of Power Engineering, Chongqing University, Chongqing 400044, China

DOI: 10.1615/IHTC16.mpf.021899
pages 6181-6189


KEY WORDS: Numerical simulation, flow pattern, thermal-solutal capillary-buoyancy convection, capillary ratio, annular pool

Abstract

In order to understand the characteristics of the coupled thermal-solutal capillary-buoyancy convection at positive capillary ratio in an annular pool subjected to simultaneous radial thermal and solutal gradients, a series of three-dimensional direct numerical simulations have been carried out. The working substance was the fluidic toluene/n-hexane mixture with the Prandtl number of 5.54 and the Lewis number of 25.78. The capillary ratio Rσ varies from 0.2 to 5. Results indicate that the thermal-solutal capillary-buoyancy flow at different capillary ratio is steady and axisymmetric when the thermal capillary Reynolds number is less than the critical value. At the fixed thermal capillary Reynolds number, the intensity of steady flow firstly reaches to the peak, and then decreases when the capillary ratio increases. With the further increase of thermal capillary Reynolds number, the steady flow bifurcates to the three-dimensional oscillatory flow. The temperature and concentration fluctuations on the free surface are indicated as "hydro-thermal wave" (HTW) and "hydro-solutal wave" (HSW). The propagating direction of the HTW or HSW is randomly clockwise or counter clockwise. The non-dimensional frequency increases with the capillary ratio and the thermal Reynolds number. Nevertheless, the wave number is independent with the capillary ratio.

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