水平空腔多孔介质自然对流各向异性和非达西效应研究

本文应用Ｄａｒｃｙ模型的改进型式－Ｂｒｉｎｋｍａｎ模型数值研究了填充各向异性多孔介质的水平空腔内部自然对流的非达西效应。结果表明：（１）较大的渗透率比导致空腔内的流动强度下降，传热速率降低；（２）较大的导热率比导致空腔内的等温线扭曲加剧，近壁流动速度加大，传热速率增加；（３）非达西效应在低渗透率比时尤为显著，忽略非达西效应的理论分析将会导致较大的误差。

NON-DARCIAN AND ANISOTROPIC EFFECTS ON NATURAL CONVECTION IN HORIZONTAL POROUS MEDIA ENCLOSURE

Natural convection heat transfer in a horizontal enclosure filled with anisotropic porous media is numerically studied by applying the Brinkman model - a modified form of Darcy model giving consideration to the viscous effect. The results show that: (1) a larger permeability ratio causes a lower flow intensity in the enclosure and a smaller Nusselt number, (2)a larger thermal conductivity ratio causes a stranger distoration of isotherms in the enclosure and a higher flow velocity near the walls and a higher Nusselt number; (3) non-Darcian effects is more significant at a lower permeability ratio and an analyiss neglecting the non-Darcian effect will inevitably be of considerable error.