[bigfans]

I am modeling an adsorption bed, in which the mixture of dry air and water vapor flows through a rectangular channel, whose top and bottom walls are zeolite-riched paper. So which model I should use to estimate the overall mass transfer coefficient, species transport? I didn't find the mass transfer coefficient in "surface integral" panel as the heat transfer coefficient. So can anybody tell me what I should do?

I also read some literature and authors used the local concentration gradient near the wall to get the local mass transfer coefficient, so how can we get the local concentration gradient in Fluent? I know Fluent can calculate local shear stress from velocity gradient near the wall, but I didn't find the simialr local concentration gradient at all.

Hope to get your suggetions!

Thanks!