多孔介质中超临界CO_2对流换热数值模拟

NUMERICAL SIMULATION ON CONVECTION HEAT TRANSFER OF CO_2 AT SUPER-CRITICAL PRESSURES IN POROUS MEDIA

本文对超临界二氧化碳在多孔结构中的对流换热进行了数值模拟研究。结果表明，超临界条件下二氧化碳剧烈的变物性对多孔介质中的对流换热会产生很大影响；局部热平衡条件下对流换热系数的数值计算值比局部非热平衡条件下的计算结果大；对流换热系数随着颗粒直径的增大而增大。

Convection heat transfer of CO2 at super-critical pressures in porous media was investigated numerically. The results show that the sharp variation of the thermophysical properties of CO2 at super-critical pressures has profound effect on the convection heat transfer in porous media. The numerical simulation results using the thermal equilibrium model were larger than that using the local thermal non-equilibrium model. The coefficient of convection heat transfer increases with increasing the particle diameters.