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为研究局部高温壁面下,复合腔体内自然对流及传热传质规律,采用一区域模型整体对腔内温度场、浓度场和流场进行求解.高温壁面无量纲长度A=0.5(A=a/H),局部壁面温度为Th,浓度为Ch;右侧垂直壁面分别为Tc和Cc.对局部高温壁面的相对位置B、多孔结构的孔隙率ε、瑞利数Ra的影响进行综合的数值计算,由数值计算结果得出:局部高温壁面位置不同,腔内流体流动及传热传质不同,B值在0.6附近时对应的平均努赛尔数Nu和平均舍伍德数Sh最大;ε=0.7时Nu出现最小值;Ra对传热传质影响也较大.
In order to study the natural convection and heat and mass transfer in the cavity under local high temperature wall, a region model is used to solve the temperature field, concentration field and flow field in the cavity. The dimensionless length A = 0.5 (A = a / H), the local wall temperature is Th and the concentration is Ch, and the right vertical wall is Tc and Cc, respectively. The integrated values of the relative position B of the local high temperature wall, the porosity ε of the porous structure and the Rayleigh number Ra From the results of numerical calculation, the local high temperature wall is different in position, fluid flow in the cavity and heat and mass transfer are different. When the B value is around 0.6, the corresponding average Nusselt number Nu and the average Sherwood number Sh are the largest; ε = 0.7 when the minimum value of Nu; Ra on the heat and mass transfer greater impact.