using rate equation for volumetric reaction

byronsmith · March 31, 2009, 13:09

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

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

kimi_hao · April 14, 2019, 12:28

Hi, i am doing a similar work and having the same problem. Have you settled that?

March 31, 2009, 13:09	using rate equation for volumetric reaction	#1
byronsmith Member Byron Smith R J Join Date: Mar 2009 Location: India Posts: 46 Rep Power: 17	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.

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April 1, 2009, 03:16		#2
satheeskannan New Member Sathees Kannan Join Date: Mar 2009 Location: India Posts: 10 Rep Power: 17	you have to give pre-exponential factor and activation energy in Fluent Reaction panel. Fluent will pass these values to your UDF.

April 8, 2009, 11:58		#4
byronsmith Member Byron Smith R J Join Date: Mar 2009 Location: India Posts: 46 Rep Power: 17	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

April 14, 2019, 12:28		#5
kimi_hao New Member 郝晨睿 Join Date: Apr 2019 Posts: 3 Rep Power: 7	Hi, i am doing a similar work and having the same problem. Have you settled that?