The Study And Simulation Of Heat And Mass Transfer's Mechanism For Porous Media's Drying

The porous media's drying was a complex heat physics process which was broadly applied in the production of industry and agriculture and in the human's living. Heat transfer and mass transfer were simultaneous in the porous media. In the last years, scientists has had terrific progress and many study fruits in the subject of porous media's drying. However, the experiment was still primary study means in the subject for the process of porous media's drying was complicated, changeful,non-steady. Therefore, it had important theoretical meaning and practical value for organizing the drying process in reson, reducing the energy's use in the drying process and advancing the drying product's quality that the heat and mass transfer's theory of drying should be enriched and perfected and the cognition of the physical mechanism of the porous media's drying should be enhanced.In this paper, the contents were as follows:(l)On the base of non-equilibrium thermodynamic theory and phase equilibrium principle ,a nonlinear mathematical model of porous media's drying was established .The coupledheat and mass transfer phenomena was considered enough in the model. Furthermore , theresearch analyses of the temperature and humidity's effect on the phase-only coefficientsbased upon the definition of chemical potential.(2) The mathematical model of corn drying was established and the solution was gainedusing the difference means. The humidity and temperature curves of corn drying weregained and the effect of a variety of factor to drying process was analyzed. It had hugepractical value and far-reaching theoretical meaning for aptly regulating the drying systemand advancing the drying quality.