Density profile and flow of miscible fluid with dissimilar constituent masses

A computer simulation model is used to study the density profile and flow of a miscible gaseous fluid mixture consisting of differing constituent masses (mA=mB/3) through an open matrix. The density profile is found to decay with the height ∝exp (−mA(B)h), consistent with the barometric height law. The flux density shows a power-law increase ∝(pc−p)μ with μ 2.3 at the porosity 1−p above the pore percolation threshold 1−pc.