Macroscopic lattice Boltzmann model for heat and moisture transfer process with phase transformation in unsaturated porous media during freezing process

Abstract

In the current study, a macroscopic lattice Boltzmann model for simulating the heat and moisture transport phenomenon in unsaturated porous media during the freezing process was proposed. The proposed model adopted percolation threshold to reproduce the extra resistance in frozen fringe during the freezing process. The freezing process in Kanagawa sandy loam soil was demonstrated by the proposed model. The numerical result showed good agreement with the experimental result. The proposed model also offered higher computational efficiency and better agreement with the experimental result than the existing numerical models. Lattice Boltzmann method is suitable for simulating complex heat and mass transfer process in porous media at macroscopic scale under proper dimensionless criterion, which makes it a potentially powerful tool for engineering application.

Lattice Boltzmann simulation of resistance coefficient of the oil and water migration in porous media

“…A chan nel model of par ti cle filled po rous me dia was es tab lished, and the re sis tance char ac ter is tics of sin gle-phase wa ter adi a batic flow were nu mer i cally sim u lated [7]. Boltzmann sim u la tion method was more suit able for the re al iza tion and re search of mi cro-struc ture of po rous struc ture [8][9][10][11][12]. For ex am -ple, per me abil ity of po rous me dia was cal cu lated us ing Boltzmann model [13], and a lat tice Boltzmann method was used to sim u late the bound ary be tween the po rous struc ture of the solid and the fluid [14].…”