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How can I modify surface reaction using UDF

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Old   July 28, 2014, 10:13
Default How can I modify surface reaction using UDF
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Hello everyone, I use Fluent to do a simulation about surface reactions. There are 8 reactions, but I only want to change one reaction rate. (for example the 2nd reaction (or reaction number 2) in my reaction settings).

I have read about the examples in the manual, DEFINE_SR_RATE…..

but still no idea how to use those f,t,r,mw,yi,rr and T_w = F_T(f,t); rho_w = C_R(c0,t0)*C_T(c0,t0)/T_w; etc..

As the default equation is k=Ae^(-E/RT), I want to keep everything unchanged, but only adding an extra term for reaction number 2, like k=Ae^((-E/RT)*(1-surface_coverage_ratio)).

My question is
How to write the code about this? Or what code should I use? How to apply it to the wall?

After apply this UDF, will I able to change pre exponential factor and activation energy from reaction window? or I have to do it within my UDF file?

Thanks a lot for any help

Last edited by Juun; July 31, 2014 at 14:55.
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