Salted water through porous media
 

Hi everyone,

I am currently modeling heat and mass transfer for a humid air flow through a membrane (a porous media). The aim is to put an inlet on the left side of the membrane with a humid air flow and on the right side ambient air. Normally, a part of the water from the humid air flow, which is at 340K evaporates, pass through the membrane and condensates on the other side.

To model it I used a mesh with three fluid volumes : one for the hot flow, one for the membrane and one for the ambient air.

But i am blocked for several issues :

1. It seems that it is impossible to model the humid air flow and in the same time the porous media. I use species transport with a mixture material to be able to change H20 and 02 fractions in boundaries conditions. However, when I use mixture for the inlet flow and to for the porous media, I can no initialize and I have the following message :

Species are not solved in neighbor cell threads (8 and 7) of interior zone 27.

Zone 27 is an interior type created after I added two new mesh interfaces for for the membrane and the volumes on each side.

And when I use only air in the three volumes, it works.

2. It seems that it is an issue on interfaces between the membrane and the other volumes. Do you think in any solution ?

3. I need to model this for a hot salted water stream, thus I have to use the mixture model

Thanks a lot !