Numerical study on heat and mass transfer mechanism of dissolved particles in porous media with corroded skeletons

Abstract

Heat and mass transfer mechanisms of dissolved particles in porous media with corroded skeletons are investigated by the coupled smoothed profile method and lattice Boltzmann method. Migration and dissolution process of particles in fluids are studied by integrating the source term which is obtained by time-split method. The particle surface temperature variation with time is considered for dynamic convection effect on particle motion. The dissolution rate is the same on the particle surface with the same radius. The solid morphology evolution of porous media is based on the volume of pixel method. The effects of the Damkohler number, Peclet number, Reynolds number, particle size, particle quantity, particle initial distribution and porosity gradient on the permeability evolution with time are investigated. The moving particle blockage effect, small pore throat suction effect, and jet effect are revealed. The porosity, permeability, porous skeleton corrosion degree and the particle migration velocity in the porous zone increase with an increase in the Damkohler number and Reynolds number, or a decrease in the Peclet number. The particle initial distribution and porosity gradient affect the porous skeleton corrosion degree.