species transport in porous media

hanlei

problem i want to solve described like this: a kind of fluid flows through a pipe made of porous medium .the fluid is a mixture of water and oxygen.oxygen can permeate through the porous medium while water not.and now i want to simulate the process of the flow and find out how much oxygen can peameate through the medium.

so ,my question is : 1.i set the medium as a porous jump,but the variables can only be set for the mixture ,not for each phase,then how can i define that only oxygen can peameate? 2.the variables for the calculation of pressure drop can also reflect the coefficient of species tranmate? thanks