骨架导热特性对部分填充多孔介质复合腔体内传热影响的模拟研究

Influence of thermal conductivity of porous medium on the heat-transfer fluid in a cavity partially filled with a porous layer

利用有限元数值方法对部分填充多孔介质复合腔体内的自然对流进行模拟研究,模拟利用两区域法来计算复合腔体内的自然对流,在多孔介质区域采用Forheimer-Brinkman-Darcy方程,在纯流体区域使用Navier-Stokes方程,重点研究了多孔介质骨架导热特性对自然对流的影响。研究发现,在一定范围内随着多孔介质导热性的增强,流体温度升高,部分填充多孔介质腔体内自然对流有一定程度的增强。

The finite element method was used to study the natural convection in a cavity partially filled with a porous layer. Natural convective heat and mass transfer in a partially filled with porous layer was studied by using the two-domain approach. The Forheimer-Brinkman-Darcy equation was developed for the porous layer,whereas the Navier-Stokes equation was set up for the clear fluid region. The influence of thermal conductivity of porous medium on the fluid flowof natural convection were focused on. The results showed that the temperature of fluid was increased and the natural convection could be showed a increasing trend with the ratio of the thermal conductivity of porous media and fluid increased.