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UDF Multicomponent Diffusivity with Knudsen term

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Old   August 8, 2008, 21:01
Default UDF Multicomponent Diffusivity with Knudsen term
Emmanuel Resch
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I'm trying to model the diffusivity in a porous region. Using the parallel pore model, the diffusivity can be the harmonic average of the effective multicomponent diffusivty (i.e. Stefan Maxwell - mc) and the Knudsen diffusivity(kn), such that 1/Deff = (1/Dkn + 1/Dsm)^(-1).

I'm just wondering if people could suggest a way to use the multicomponent diffusivity model in Fluent to calculate Dsm, but then use this diffusivity to calculate a Deff as above that will be used in governing transport equations...

Thanks a lot,

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