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本文对二维颗粒弥散多孔介质的辐射导热耦合等效热导率进行了数值计算研究。首先采用随机生成结构方法(Random generate-growth method,RGGM)生成实际多孔材料的复杂结构。在此基础上,采用离散坐标法及有限容积法求解了复杂结构内部辐射导热耦合换热,进而计算得到材料的等效热导率。根据建立的材料随机结构模型及等效热导率数值计算模型,分别研究了衰减系数、弥散相体积分数、温度等因素对材料等效热导率的影响,并将数值计算结果与理论计算结果进行对比,吻合较好,反映出模型用于预测实际多孔材料等效热导率的有效性。
In this paper, the numerical calculation of radiative heat transfer coupled thermal conductivity of two-dimensional particle-dispersed porous media is studied. First, a random generation-growth method (RGGM) is used to generate the complex structure of the actual porous material. On the basis of this, the discrete coordinate method and the finite volume method are used to solve the coupled heat and radiation heat transfer inside the complex structure, and then the equivalent thermal conductivity of the material is calculated. According to the established stochastic structure model and the numerical model of the equivalent thermal conductivity, the effects of the factors such as the attenuation coefficient, the volume fraction of the dispersed phase and the temperature on the equivalent thermal conductivity of the material were studied respectively. The numerical and theoretical results The results are in good agreement with each other and reflect the validity of the model to predict the equivalent thermal conductivity of the actual porous materials.