摘要
利用Darcy流动模型,同时考虑粘性耗散效应,分析研究了以两等温平板为边界的多孔介质中,热发展强迫对流的熵产.参数研究表明,组参数和Péclet数减小,而Brinkman数增大时,熵产增大.形象化的热线表示方法着重应用于Br<0的情况,在这种情况下,在顺流的某些位置上,存在热传递方向的改变,即从原来的壁面向外传热变为向壁面传热.
Entropy generation for thermally developing forced convection in a porous medium bounded by two isothermal parallel plates was investigated analytically on the basis of the Darcy flow model where the viscous dissipation effects had also been taken into account. A parametric study showed that decreasing the group parameter and the Péclet number increases the entropy generation while for the Brinkman number the converse is true. Heatline visualization technique is applied with an emphasis on Br is less than 0 case where there is somewhere that heat transfer changes direction at some streamwise location to the wall instead of its original direction, i, e. from the wall.
出处
《应用数学和力学》
CSCD
北大核心
2008年第2期209-216,共8页
Applied Mathematics and Mechanics
基金
昆士兰大学按照UQILAS,Endeavor IPRS和学院奖学金提供的资助.
关键词
熵产
多孔介质
热线
能通量矢量
强迫对流
entropy generation
porous media
heatline
energy flux vectors
forced convection
