ZHU Qingxia ,LUO Minghua, LIANG Huayin

(Jingdezhen Ceramic Institute, Jingdezhen 333001)

Abstract: The equivalent diffusion model of heat and mass transfer in porous media was established based on Whitaker's local volume average equations. The numerical analysis of the porcelain tile during the convective drying process was made and the numerical solutions agreed well with the experimental results. The effects of the drying medium parameters and the tile physical parameters on the drying process were investigated. The results show that hot air with high temperature, flow speed, low humidity is in favor of drying, in which the temperature and humidity have the obvious effect and the flow rate has little effect on the drying rate. The effective diffusion coefficient has a great influence on the humidity distribution inside the tile, and the effective thermal conductivity has little impact on the humidity distribution.

Keywords: equivalent coupling diffusion, heat and mass transfer, numerical simulation