About PTFEs in porous media

Dear Palabos-er:
PTFEs contribute to water removal if they are positioned in porous media. Usually, PTFEs cover on the surface of the skeleton of porous media(like carbon fiber in gas diffusion layer in PEFMCs).

My question is: how does PTFE change the boundary condition to realize " faster water removal" comparing with ordinary solid. In detail, what should I do to the codes in Palabos to realize the function “add or recognize PTFEs in geometry file and set them special boundary condition” .

Hoping for discussion and Best wishes for you!