中文摘要：

采用格子Boltzmann方法对真实多孔介质复合腔体内的对流传热进行研究，分析了不同Ra、多孔介质高度Y和厚度δ条件下交界面处的热滑移效应，并确定热滑移系数。利用 X-CT技术对真实多孔介质材料进行断层扫描，获得实际材料内部结构图片，并进行图片处理，再导入格子Boltzmann模型中进行求解。计算结果表明：等效热滑移系数随高度Y的影响较大，靠近壁面或固体表面的系数偏大，而间隙处的系数偏小，但两处各自的值基本相同；Ra和厚度δ的变化对等效热滑移系数的作用较小。

英文摘要：

The natural convection heat transfer in a cavity partially filled with an actual porous medium was numerically studied using lattice Boltzmann method.The heat slip effect at the porous/fluid interface was analyzed under different Ra numbers,heights and thickness conditions of the porous medium.The images of real porous structure obtained by X-ray computed tomography technique were processed and imported into the lattice Boltzmann model. The numerical results show that the equivalent heat slip coefficient is greatly affected by the height,and in the near wall region or on the solid surface the coefficient is larger than in the central gap.However,the coefficient remains nearly the same on both sides.The influence of both Ra number and thicknessδis minor.