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学科主题: Thermodynamics ; Engineering, Mechanical ; Mechanics
题名: Double-diffusive buoyancy convection in a square cuboid with horizontal temperature and concentration gradients
作者: [Chen, Zhi-Wu ; Zhan, Jie-Min ; Luo, Ying-Ying] Sun Yat Sen Univ, Dept Appl Mech & Engn, Guangzhou 510275, Guangdong, Peoples R China ; [Li, Yok-Sheung] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China ; [Chen, Zhi-Wu ; Cai, Shuqun] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
通讯作者: cejmzhan@gmail.com
关键词: Double-diffusive convection ; Buoyancy ; Instability ; Pitchfork bifurcation
刊名: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
发表日期: 2013
卷: 60, 页:422-431
部门归属: LTO
资助者: The work described in this paper was jointly supported by a grant from The Hong Kong Polytechnic University (Project No. G-U666) and the National Natural Science Foundation of China (No. 40906006 and No. 41025019).
摘要: Double-diffusive buoyancy convection in a three-dimensional (3D) square cuboid is studied in the present paper. Both the temperature and solute concentration gradients are applied horizontally. Direct numerical simulations are carried out for Rayleigh number 10 <= Ra <= 2 x 10(5), buoyancy ratio -2 <= R-rho <= 0, and Lewis number 2 <= Le <= 1000. Different front-rear symmetric solutions are found, and the flow structures are essentially three-dimensional. As each of the parameters is varied, typical pitchfork bifurcation is encountered, given appropriate disturbances. The resultant asymmetric solution presents a diagonal flow configuration. Different solution branches are denoted in terms of Nusselt and Sherwood numbers and corresponding two-dimensional (2D) model results are also presented to depict the deviations. In some parameter ranges, the 2D model significantly over-predicts the heat and mass transfer rates. More importantly, it fails to predict any unsteadiness of the flow, even when the corresponding 3D solution is chaotic. The onset of convection from the quiescent equilibrium state is also considered. (C) 2013 Elsevier Ltd. All rights reserved.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000317534500047
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10915
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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[Chen, Zhi-Wu; Zhan, Jie-Min; Luo, Ying-Ying] Sun Yat Sen Univ, Dept Appl Mech & Engn, Guangzhou 510275, Guangdong, Peoples R China; [Li, Yok-Sheung] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China; [Chen, Zhi-Wu; Cai, Shuqun] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China.Double-diffusive buoyancy convection in a square cuboid with horizontal temperature and concentration gradients,INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2013,60():422-431
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