倾斜度及温度震荡频率对三维多孔介质方腔自然对流换热的影响  

Three Dimensional Convective Heat Transfer in a Cubic Porous Enclosure:Inclination and Temperature Oscillation Frequency

作　　者：杨剑[1] 曾敏[1] 王刚[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5期561-568,共8页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(No.50521604)资助项目

摘　　要：对三维多孔介质倾斜方腔内非稳态自然对流换热进行数值研究.腔体右壁面（X=1）保持恒温T0,左壁面（X=0）基于温度T0按正弦规律变化,其他所有壁面保持绝热.采用Brinkman扩展达西模型及SIMPLE算法模拟方腔内的流动.方腔沿y轴转动倾角α1的变化范围为0°～90°,沿x轴转动倾角α2的变化范围为0°～45°,无量纲温度震荡频率f的变化范围为5π~90π.详细研究倾角和温度震荡频率对三维方腔自然对流换热的影响.计算结果表明：当倾角α1=46°,α2=45°及温度震荡频率f=45π时,方腔内的换热最强.Three dimensional unsteady natural convective heat transfer in an inclined cubic enclosure with porous medium is studied numerically. The right side wall （ X = 1 ） of the enclosure is kept at a constant temperature of To, Temperature of the opposite vertical wall （ X = 0） varies by sine law with a mean value of To. Other walls are kept adiabatic. A Brinkman-extended Darcy model is used to describe flow through porous medium in the enclosure and the equations are solved with SIMPLE algorithm. Inclination angle α1 rotating around Y coordinate varies between 0°and 90°. Inclination angle α2 rotating around X coordinate varies between 0° and 45°. Dimensionless temperature oscillation frequency f ranges from 5° to 90π. Effects of inclination angles and temperature oscillation frequency on heat transfer are studied in detail. It shows that the maximal heat transfer is achieved at an inclined angles α1 = 46°, a2= 45° and a temperature oscillating frequency f=45π.

关 键 词：周期性边界条件 多孔介质 自然对流 三维数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]