hello,can i modify the surface reaction rate model and add some source terms on it in discrete phase modeling? if can and how to do?

Dear Wang

Fluent Model

1) Particle reaction(in general, combustion) :

- Particle Heating, say law 1

- Devolatilization(part of particle converts to gaseous fuel), say law 4

- Char combustion, say law 5

- Inert(ash) cooling or heating, say law 6

2) Droplet reaction(in general, combustion) :

- Droplet heating, say law 1

- Droplet vaporization, say law 2

- Droplet boiling, say law 3

The above law number is based on Fluent 4.x.

I have experience for making another law by using 'User Subroutine' with Fluent 4.x. And my friend says that it can be possible by making UDF for version 5.x and above. I do not have experience with UDF for another reaction. But conceptually, I think that you can combine,

1st step : your law by UDF, where solid converts to the liquid

2nd step : law 1

3rd step : law 2

4th step : law 3

I know that this reply is not enough, but hoping good luck with you.

Sincerely, Jinwook