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Modelling species transport and implementing reaction rates

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Old   May 11, 2017, 10:29
Default Modelling species transport and implementing reaction rates
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res
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Dear all,

I am working on implementing a photocatalytic oxidation reaction in Fluent, where a species (here ethylene) is oxidized over a TiO2 surface. Globally, the reaction is:

C2H4 + 3O2 --> 2CO2 + 2H2O

which follows a so-called Langmuir-Hinshelwood reaction rate expression:

r = k*K*[C2H4]/(1+K[C2H4])

where k and K are constants.

From my understanding I should include this reaction rate as a source (sink) term in the transport equation of the species to account for the disappearance of species. Should I use a UDS for the transport of ethylene, which should have as a source term the UDF that defines the reaction rate?

Since I am new to UDFs/UDSs, could someone guide me through the process, at least in the grand scheme of things, which steps I should follow, what and where to define, how to set up a UDS for the transport of species...

Any help is appreciated!

Thank you so much!
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