[Anshul7]

Hi all,

I am working on methanol steam reforming using packed bed.

In reference paper, they mentioned that effective mass diffusivity will:

D_eff= (porosity^tortousity)*Diffusion coefficient



this is valid for porous zone only, for other zone:

D_eff= Diffusion coefficient



How can we accomodate this in FLUENT as we can give diffusivity only once in mixture tab ?

If there is any UDF format for this, please let me know.

Please help me with this.