Hi everyone,

In fluent, when specifying chemical reactions, I am asked the preexponential factor, the temperature exponent and of course the activation Energy.

But what is the coefficient rate ? There is one different by species and I can't figure out with the fluent user's guide how to calculate it.

Thanks a lot

if you mean rate exponent, i can tell you that we have the same problem. however, i think that it is more chemistry than software. i advise you to look for it in a chemical forum. i posted a message on chemicalforums.com (general chemistry)about that purpose. You can get answers there. if i will get something i will share it with you good luck

Like all engineering problems, just keep the units consistent. Seems simple, but it is easy to waste a week or two because of a simple conversion error - I know from experience.

what do you mean ? For instance

CH4 + 02 -> 2 H20 + CH2

What rate coefficient do you set ?