Pore-scale investigation on the thermochemical process in uniform and gradient porous media considering immiscible phase

Abstract In the present study, the complex thermochemical process in uniform and gradient porous media is investigated by the thermochemical dissolution model based on the lattice Boltzmann method considering immiscible phase. The two immiscible phase flow, solute transport and heat transfer are solved by Shan-Chen multicomponent lattice Boltzmann model, mass transport lattice Boltzmann model and multicomponent thermal lattice Boltzmann model, respectively. The immiscible phase, undissolved solid component and porosity gradient effects on the thermochemical process are investigated. For the solid, the dissolvable component is considered and updated by Volume of Pixel method. The results show that the immiscible phase and its initial distribution considerably affect the solid dissolution, acid transport and the average temperature in porous media. The undissolved solid component and the porosity gradient influence the thermochemical process significantly.