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论文类型：期刊论文

发表时间：2009-04-01

发表刊物：INTERNATIONAL JOURNAL OF MODERN PHYSICS C

收录刊物：SCIE

卷号：20

期号：4

页面范围：513-526

ISSN号：0129-1831

关键字：Porous material; effective thermal conductivity; fractal dimension; random numerical simulation; FEM

摘要：The relationship between thermal conductivity of porous material and fractal dimension is numerically simulated by using the finite element method. The solid matrix and pore space are generated randomly according to material porosity. Material parameters and element properties are changed by using ANSYS parameter design language. The effective thermal conductivity is derived according to thermal flux through some sections computed by FEM and Fourier heat transform law. The investigation shows that the effective thermal conductivity decreases with increasing porosity. The effective thermal conductivity will decrease exponentially with increasing fractal dimension of porosity space and increase exponentially with increasing fractal dimension of solid matrix.