Can soot be calculated by having the general mechanisms of reactions of methane, ethane, propane, butane and pentane?
It is possible You will also need surface reactions. There are inbuilt soot models in ansys fluent which an be used for certain conditions. You can add more details about the specific problem you are working on..
I will recommend you to use FDS as it is very well validated.
You can do that but you should define the soot in the output of the chemical reactions.
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