Hits:

Indexed by:期刊论文

Date of Publication:2009-04-01

Journal:INTERNATIONAL JOURNAL OF MODERN PHYSICS C

Included Journals:SCIE

Volume:20

Issue:4

Page Number:513-526

ISSN No.:0129-1831

Key Words:Porous material; effective thermal conductivity; fractal dimension; random numerical simulation; FEM

Abstract: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.