Pore Network Simulation And Experimental Study On Porous Media During Drying Process

This paper presents a review of the moisture transfer theories in porous media during drying processes in the last century. Then an innovative pore network model in drying based invasion percolation theory and pore network theory essentially different from the classical continuum model is developed. Moisture transfer characteristics in porous media during drying process are studied under isothermal and absence of gravity. Dynamic drying processes are obtained and a series of moisture phase distribution images are drew using computer simulation. Images clearly show fractal drying front. A strange drying phenomenon that moisture transfers not only from inner to outer, but also from outer to inner of porous media is observed. Results of simulation prove the significance of the pore size distribution in drying of porous media. In addition to drying simulation, a two-dimensional transparent porous media experimental model is set up. Fractal drying front is investigated and gravity are helpful to stabilize drying front. Drying rates are determined by recording the micromodel weight evolution during drying.