porosity
 

Hi, I just realized that the porosity factor has no effect on the concentration of the scalars. I checked the moles/m^3 in a void space and in a porous medium and they are the same! I might be wrong but I dont think it is possible that you can have the same concentration in an open space than in a one that is supposed to be partially blocked by a solid fraction. Has anybody came across this problem?, could you please suggest something? Many thanks CM