Learning Forum

[eng_m_m.abd89]

Hello,

I am writing a UDF to reflect a gas generation model of battery components. I have 10 chemical reactions, and I can define the reaction rate of reactants using the Arrhenius equation. But how to model the total number of moles of gases generated from these chemical reactions?

attached is the table of the reaction rates. I assume I can calculate the generated number of moles for specific species such as (CO2) for example using the below equation

Generation rate = sum of (stoichiometric coefficient x reaction rate)

amount of species = accumulated generation rate x volume

Any suggestions or recommendations will be very helpful.

[Rob]

If all reactions are Arrhenius rate based why not just use the Fluent species models without UDFs? 

[eng_m_m.abd89]

Hey Rob, 

Thanks for answering. I thought about it; I am validating a paper, and they did UDF. I think they used the UDF, because this gas generation model links two other models, which are heat generation within the battery, and then the gas vent.

Regards,

Mahmoud

[Rob]

Then you may need to review the source term macros for the gas generation.