Learning Forum

[z5489721]

In particle reaction rate calculations, do I need to update the gas species fractions (such as H₂ and H₂O) in the UDF? While the mass fractions of solid species change, those of H₂ and H₂O doesn't change. I'm calculating the reaction rate for hematite reduction with hydrogen. If the gas fractions need to be updated, should I define a new macro like DEFINE_SOURCE or use a different approach?

[Rob]

In theory Fluent should handle that unless you're doing something odd with the UDF. 

[z5489721]

What about particle components? I am using TP_COMPONENT_I(tp, i) to get the mass fraction of hematite and iron in my particle. Do I need to update them by calculating reduced hematite and produced iron based on reaction rate *rr?

[Rob]

These should also be accounted for in the reactions. Ie the rate will determine how quickly something is used up, and the solver will track how much is left.