摘要
采用局部非热平衡模型,在层流范围内对骨架发热多孔介质竖直通道内的非达西强制对流换热进行了数值研究。采用Forchheimer-Brinkman拓展Darcy模型描述多孔介质内的流动,详细研究了表观雷诺数Re(0.5≤Re≤50),有效导热系数比Γ(0.001≤Γ≤1.0)和Da(10-3≤Da≤10-5)变化对多孔介质流道内流动换热的影响。计算结果表明:Re、Γ和Da变化对流道内流动换热影响显著;当Re、Γ较小而Da较大时,多孔介质流道内局部非热平衡效应明显,必须采用局部非热平衡模型才能对流道内的对流换热特性进行合理准确的预测。
Steady laminar non-Darcian forced convection in a vertical channel filled with heat-generating porous medium is studied numerically by using the local thermal non-equilibrium model. The heat source generated by solid framework is uniform and kept constant; and the temperature of vertical walls is kept at constant temperature To. The flow inside porous medium is modelled by using Forchheimer-Brinkman extended Darcy model. The effects of Reynolds number （0.5 ≤Re≤50）, effective fluid-to-solid thermal conductivity ratio Г （0.001 ≤Г≤ 1.0） and Darcy number （10^-3≤ Da≤ 10^-5） are analyzed in detail. It is found that, the effects of Re, Fand Da are remarkable; at low values of Re and Г, and at high value of Da, the effect of local thermal non-equilibrium is significant and the local thermal non-equilibrium model should be adopted for predicting the heat transfer characteristics exactly.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2009年第2期16-20,50,共6页
Nuclear Power Engineering
基金
国防科技重点实验室基金项目(No.9140C7102010804)资助
关键词
多孔介质
骨架发热
强制对流
局部非热平衡
数值模拟
Porous medium, Heat-generating solid phase, Forced convection
Local thermal non- equilibrium model, Numerical simulation
