Capillary valve effect during slow drying of porous media
Abstract(#br)In this paper, a pore network model, which accounts for the capillary valve effect induced by the sudden geometrical expansion of the void space, is developed for slow drying of porous media. To validate the developed model, an optical drying experiment is conducted with a two-dimensional Polydimethylsiloxane microfluidic network composed of regular pores and throats. It is revealed that if the capillary valve effect is considered in the model, better agreement is obtained between numerical simulation and experimental data.