Nonequilibrium Thermal Dynamic Modeling of Porous Medium Vacuum Drying Process

Abstract EN

Porous medium vacuum drying is a complicated heat and mass transfer process.

Based on the theory of heat and mass transfer, a coupled model for the porous medium vacuum drying process is constructed.

The model is implemented and solved using COMSOL software.

The water evaporation rate is determined using a nonequilibrium method with the rate constant parameter Kr.

Kr values of 1, 10, 1000, and 10000 are simulated.

The effects of vapor pressures of 1000, 5000, and 9000 Pa; initial moistures of 0.6, 0.5, and 0.4 water saturation; heat temperatures of 323, 333, and 343 K; and intrinsic permeability of 10−13, 10−14, and 10−15 m2 are studied.

The results facilitate a better understanding of the porous medium vacuum drying process.