The structure of porous media with large porosity is described by a spatial periodic Weaire-Phelan model

which is built by the Surface Evolver software

and the application range of this model is determined by comparison of experimental data and simulation result for thermal effective conductivity. Based on the model

numerical computations on two specimens

with air and water as working fluids and aluminum T-6201 as solid matrix

are conducted. The effects of working parameters

such as pore size

Darcy velocity and ratio of thermal diffusion coefficient of fluid to solid

on the thermal dispersion are discussed. The simulation result shows that smaller diameter and stronger dispersion result in a more sensible dependency on thermal physical properties. In addition

the transversal component is far smaller than the longitudinal one. Empirical correlations for the longitudinal and transversal thermal dispersion are obtained in term of Peclet number.