复杂多孔介质腔体内自然对流换热的数值研究  

Natural Convection in a Wavy Enclosure Filled with Porous Media

作　　者：曾敏[1] 王刚[1] 谢公南[1] 陈秋炀[1] 王秋旺[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《计算物理》2008年第4期445-449,共5页Chinese Journal of Computational Physics

基　　金：国家教育部"新世纪优秀人才支持计划"(No.NCET-04-0938)资助项目

摘　　要：采用曲线坐标系下压力与速度耦合的SIMPLEC算法,数值研究复杂多孔介质腔体内的自然对流换热问题.腔体的曲面温度分别保持恒定,上下表面绝热.在曲线坐标系中用有限容积法离散方程,并采用Brinkman扩展达西模型及局部非热平衡模型求解,综合研究Rayleigh数,Darcy数、孔隙率等参数对腔体内自然对流换热的影响.计算结果表明:Rayleigh数和Darcy数的影响最大而孔隙率的影响很小,同时存在使得腔体内换热达到最强的最佳纵横比.We study heat transfer and fluid flow in a complex enclosure fiLled with porous media, with SIMPLEC （Semi-Implicit Method for Pressure Linked Equations Consistent） algorithm in curvilinear coordinates. The upper and lower walls of the enclosure are horizontal and adiabatic. The vertical wall forms cosine curve and is kept at a constant temperature. Governing equations are discretized with a finite-volume method on body-fitted coLlocated grids. Brinkman-extended-Darey model and local thermal non-equilibrium model are used to solve momentum and energy equations. Effects of parameters, such as Rayleigh numbers, Darey numbers and porosity, on heat transfer and fluid flow are studied. It is shown that Rayleigh numbers and Darey numbers have significant effect while porosity is negligible. There exists an optimal aspect ratio to make the heat transfer rate maximum.

关 键 词：多孔介质 复杂腔体 自然对流 数值研究 

分 类 号：TK124[动力工程及工程热物理—工程热物理]