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UDF for REACTION RATE

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Old   July 13, 2017, 07:57
Default UDF for REACTION RATE
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Hi every body,
I want to simulate a photochemical reaction rate which is dependent on the concentration of the reactant and on the light intensity.
R=K C I^0.65

where
R is the reaction rate, K is the rate constant that is independent on the

light intensity
I, C is the concentration of a reactant and I is the intensity.
I performed the hydrodynamics and radiation modeling ,
I can have I as a function of the displacement from the radiation source, please help me on how to write the UDF of this reaction rate?
Thanks,
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