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-   -   using rate equation for volumetric reaction (http://www.cfd-online.com/Forums/fluent/63186-using-rate-equation-volumetric-reaction.html)

byronsmith March 31, 2009 13:09

using rate equation for volumetric reaction
 
hai
I am trying a reaction in fluent for which i have its rate equation. i have written a udf and the udf is compiling and is hooked in fluent. but when i open the reactions panel for finite rate it asks the preexponential and activation energy. can someone help me by giving the procedure of using the rate equation to run the reaction in fluent.

satheeskannan April 1, 2009 03:16

you have to give pre-exponential factor and activation energy in Fluent Reaction panel. Fluent will pass these values to your UDF.

Laci April 1, 2009 03:46

Quote:

Originally Posted by byronsmith (Post 211448)
hai
it asks the preexponential and activation energy

The reaction rate constant (k) is calculated from this two value with the Arrhenius equation. This is how the 'k' become temperature dependent.

byronsmith April 8, 2009 11:58

hai
thanks for ur reply. but I have a reaction rate equation where the k value and keq value are expressed in terms of temperature. so the udf will take the temperature from the fluent and calculates the rate of the reaction. I want to use this reaction rate instead of the rate expressed by arrhenius type in the reactions panel. how to do that


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