摘要
采用 Darcy 模型的改进形式——Brinkman 模型(包括粘性效应项)研究了底部恒温加热、顶部恒温冷却、竖壁绝热的水平矩形闭合空腔内充满流体的多孔介质中的自然对流传热。数值计算结果表明:在相同的形状比和瑞利数下,与达西流传热系数的差别最大可达30%.当 Da≥10^(-3)时,Darcy 模型所描述的达西流概念已不再成立,如果不考虑粘性效应的影响,则会给理论分析结果带来一定的误差.
Natural convection in the saturated porous media inside horizontal rectangular enclosures with the heated bottom and cooled top both kept isothermal and the vertical walls adiabatic is analyzed numerically applying the Brinkman model——a modified form of Darcy model giving consideration to the viscous effect.At the same Rayleigh number and aspect ratio,it is shown that the natural convection heat transfer coefficient would differ from those of Darcy flow up to an amount of 30%.With D ≥10^(-3),the Darcy flow as depicted by the Darcy model is no longer existing;and an analysis neglecting the viscous effect will be inevitably in considerable error.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
1990年第1期39-46,共8页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金
关键词
传热
自然对流
多孔介质
闭合
空腔
heat transfer
natural convection
porous medium/rectangular enclosure
Brinkman model
