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define mass diffusivity for each zone

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Old   February 3, 2009, 11:22
Default define mass diffusivity for each zone
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kim
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Dear Fluent-User!

I am modelling mass transfer in two zones.

One zone is a normal duct and another zone is a porous media.

I want to use kinetic theory for mass diffusivity in the duct.

For the porous media, as I know, I must write DEFINE_DIFFUSIVITY.

But, if I define DEFINE_DIFFUSIVITY in the materials panel, I can not use kinetic theory, can I?

What can I do for this case?

Thank you in advance
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Old   October 17, 2011, 20:36
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Nathan
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Hi Kim

I have a similar problem, did you find any answer? it would help me a lot. I want to use the kinetic option theory for both and then use C_DIFF_L macro to manipulate the diffusivity. What do you suggest? I had a problem with my UDF.h code it is online now.

Cheers,
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