[mpieber]

Dear community members,

are there any possibilities to simulate adsorption inside porous or solid particles (surrounded by fluid) in Fluent?

Thanks,
Markus

[vinerm]

Is the objective to study the adsorption rate or is it to study diffusion or flow inside the porous zone with a given adsorption rate?

[mpieber]

Dear Vinerm,

The objective is to simulate a packed bed adsorber (break-through curve) in which the flow around the particles should be resolved (particle-resolved simulation) and adsorption occurs inside the particles (either with a certain rate or following a specified adsorption isotherm).

Which approach would you suggest for this case?

Thanks,
Markus

[vinerm]

If you wish to resolve the bed, then you have to provide mass transfer rate at the boundaries. This could be linear or otherwise. Usually, porous model is employed for modeling the bed instead of resolving it. But it depends on particle diameter. If particles are really big, then those can be resolved. Else, it would become like DNS. Secondly, it is very difficult to apply wall boundary condition on such particles; no slip is invalid on such particles because these are not solid particles. For adsorption, you can solve another scalar; using UDS option in Fluent.

[mechiebud]

Hi,

I too want to model adsorption of gas in a monolithic structure. I have written udfs for it. However, no mass transfer is taking place between the monolithic wall and gas phase hence no adsorption occurs. Can anyone guide me resolve the problem.