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本文采用控制容积法,界面调和平均导热系数值以及图形处理方法对典型非均匀多孔介质硬质聚氨酯泡沫材料的导热过程进行了分析与模拟计算。结果表明:多孔介质的内部结构是影响温度分布和热量传递的主要的因素,其影响程度与骨架和孔隙的导热系数,孔隙的大小和分布有关;计算得到的有效热导率值与文献中实验测量结果吻合较好。本文的研究结果可以推广到更为复杂的非均匀多孔介质的场合,从而可以进一步认识非均匀多孔介质中的导热规律,为工程计算提供更精确的计算方法。
In this paper, the heat transfer process of typical non-uniform porous medium rigid polyurethane foam is analyzed and simulated by the control volume method, the interface average thermal conductivity value and the graphic processing method. The results show that the internal structure of porous media is the main factor affecting the temperature distribution and the heat transfer. The degree of influence is related to the thermal conductivity of the framework and pores, the size and distribution of the pores. The calculated effective thermal conductivity is in good agreement with the experimental data The measured results agree well. The results of this paper can be extended to more complex heterogeneous porous media, which can further understand the thermal conduction in non-uniform porous media and provide more accurate calculation method for engineering calculation.