Computer simulation study of the permeability of a porous sediment model

摘要

A computer simulation model is used to study the permeability of fluid flow through porous media generated by the random distribution of the sediments in a two-dimensional lattice. Fluid particles are confined to pore space with the sediments forming the rigid barriers at the pore boundaries. An interaction between the fluid particles and the pore substrate is introduced to incorporate the additional drag in the pore space. The pressure gradient causes a bias to drive the fluid and the Metropolis algorithm is used to hop the fluid particles. The permeability of this system is studied as a function of the global pressure, the concentration of the fluid particles, and the porosity. The permeability shows a nonmonotonic dependence on the fluid concentration and on the driving bias. The fluid particles exhibit unusual transport behavior as the ramification of the porous media is enhanced and the bias is increased.