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介质参数对多孔介质腔内自然对流换热的影响 被引量:2

Influence of different medium parameters on natural convection in a square enclosure filled porous medium
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摘要 采用局部非热平衡模型,对非热平衡多孔介质方腔内的非达西自然对流进行了数值研究,采用Brinkman-Darcy-Forchheimer模型描述多孔介质内的流动,研究在不同参数条件下,即Pr、Da、空隙率φ、Ra等参数的不同取值下,有效导热系数比γ及无量纲容积换热系数H对多孔介质自然对流换热的影响,研究表明:γ的增加会削弱方腔内自然对流换热;ε、Da数的增大能够增加流体相平均Nu数,而对于固体相则有降低的作用;综合表明,只有在γ取值达到10.0以上时,局部热平衡假设才能得以成立。 The local thermal non-equilibrium model is adopted in simulating non-Darcian natural convection in a square cavity filled with a heat-generating porous medium.The flow field is modeled by using the Brinkman-Darcy-Forchheimer model and the effects of γ、H 、Da and Ra on the flow and heat transfer characteristics are analyzed.It is found that the parameterγ can reduce the heat transfer of porous medium,ε and Da can enhance the Nusselt number of fluid phase.The parameter γ has the dominant effect on heat transfer in porous medium and the local thermal equilibrium model only could be adopted when value of γ is no less than 10.0.
出处 《辽宁工程技术大学学报(自然科学版)》 CAS 北大核心 2009年第S1期51-53,共3页 Journal of Liaoning Technical University (Natural Science)
基金 西安石油大学博士科研启动基金资助项目(Z07013)
关键词 非热平衡模型 多孔介质 自然对流 数值模拟 thermal non-equilibrium model porous medium natural convection numerical simulation
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