周期性边界条件下多孔介质方腔内自然对流换热数值研究  

Numerical Study of Natural Convection Heat Transfer in a Porous Cavity Under Time-periodic Boundary Conditions

作　　者：王刚[1] 曾敏[1] 黄自鹏[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

出　　处：《计算物理》2007年第3期282-286,共5页Chinese Journal of Computational Physics

基　　金：国家自然科学创新研究群体基金(50521604)资助项目

摘　　要：对充满多孔介质的倾斜方腔,在其上下壁面绝热、右侧壁面维持恒温T0及左侧壁面温度基于T0随时间按正弦规律变化的情况下,采用Brinkman扩展达西模型和SIMPLER算法对方腔内的自然对流与换热进行了非稳态数值模拟,方腔倾角α的范围为0°-90°,Pr数为1,Ra数为106.计算研究不同的振荡频率和方腔倾角对方腔内对流换热的影响.数值模拟结果表明:振荡频率f为60π,方腔倾角为43°时,方腔内的换热最强.Unsteady natural convection heat transfer of incompressible fluid in an inclined cavity filled with saturated porous medium is studied numerically. The temperature of the cold sidewall maintains constant and the temperature of the opposite sidewall varies sinusoidally with time. The Brinkman-extended Darcy model and SIMPLER algorithm are adopted. Comprehensive numerical solutions are acquired at a fixed Prandtl number Pr = 1 and a Rayleigh number Ra = 10^6 . The inclination angle of the enclosure a varies from 0° to 90°. The effects of a and dimensionless oscillation frequency f on the natural convection are analyzed. The maximum heat transfer is reached at f = 607 and α = 43°.

关 键 词：周期性边界条件 多孔介质 自然对流换热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]