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Old   July 7, 2007, 04:27
Default Rate coefficient
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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
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Old   July 8, 2007, 08:37
Default Re: Rate coefficient
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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 (general chemistry)about that purpose. You can get answers there. if i will get something i will share it with you good luck
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Old   July 9, 2007, 13:31
Default Re: Rate coefficient
Allan Walsh
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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.
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Old   July 9, 2007, 13:39
Default Re: Rate coefficient
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what do you mean ? For instance

CH4 + 02 -> 2 H20 + CH2

What rate coefficient do you set ?
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