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多孔介质壁面封闭腔体的自然对流在太阳能暖房、蓄热腔体等中有重要的应用。该文针对左侧部分多孔介质壁面矩形封闭腔体,基于有限元法对封闭腔体的自然对流换热进行了数值模拟,得到了在不同Ra数、宽高比A以及不同壁面工况条件下腔体内空气的速度分布,同时获得右壁面的平均Nu数。研究结果表明:随着A的增大,腔体内的流动减弱,右壁面换热减弱;而左侧部分多孔介质壁面对腔体的流动换热产生很大的影响。
The natural convection of closed cavity in porous media wall has important application in solar thermal house, thermal storage cavity and so on. According to the rectangular closed cavity on the left part of the porous media wall, the numerical simulation of the natural convection heat transfer of the closed cavity was carried out based on the finite element method. The results obtained under different Ra numbers, aspect ratios A and different wall conditions The velocity distribution of the air inside the cavity, meanwhile obtaining the average Nu number of the right wall. The results show that with the increase of A, the flow in the cavity is weakened and the heat transfer in the right wall is weakened. However, the wall of the left part of the porous medium has a great influence on the flow and heat transfer of the cavity.