Numerical simulation of pore structure on radon permeability and diffusion of porous media

In this study, the quartet structure generation set was used to constructed different pore structures, and COMSOL was used to simulate radon diffusion and seepage. The permeability and diffusion coefficients of the porous media were back-calculated by Darcy's law and Fick's law. The results shows that the permeability and diffusion coefficient of porous media are positively correlated with the porosity of media, while a negative correlation with the core distribution probability. In addition, the values of diffusion coefficient and permeability of porous media depend on their pore structure and the properties of the medium, instead of the boundary conditions.