粘性耗散及变物性对多孔介质中对流换热的影响研究

本文通过理论分析、数值模拟与实验研究的综合，研究了粘性耗散及变物性对多孔介质中对流换热的影响。发现：用理想的等热流边界条件可以较好地数值模拟等热流边界条件下多孔介质中的对流换热；在实际可实现的参数条件下，粘性耗散对多孔介质中对流换热的影响不大；油的变物性对换热的影响很大—热流密度越高，对流换热越强。

NUMERICAL INVESTIGATION ON THE EFFECTS OF VISCOUS DISSIPATION AND VARIABLE THERMO-PHYSICAL PROPERTIES ON FORCED CONVEC-TION HEAT TRANSFER IN POROUS MEDIA

The effect of viscous dissipation, thermal dispersion, particle diameters and variable properties of oil on convection heat transfer are investigated numerically using a thermal non-equilibrium model in comparison with experimental data in this paper. It is shown that under practical conditions the influence of viscous dissipation on the convection heat transfer is small. Fluid temperature on the bottom part of the channel is higher than in the core region of the channel when the lower plate is adiabatic due to the effect of viscous dissipation. The variation of the thermal physical properties of oil has a profound influence on the convection heat transfer coefficient, which increases as the heat flux increases.