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-   -   third-body efficiency (http://www.cfd-online.com/Forums/fluent/95670-third-body-efficiency.html)

San Siro December 28, 2011 09:33

third-body efficiency
 
hi,I need to specify the third-body efficiency of the species in the reaction.I have got some of the values from the literature,but there are still many values unknown for the literature doesn't give the specified value.The default value in the fluent is set to 1.I am wondering if I need to change that value.Any reply will be highly appreciated.

Jenny_W March 3, 2013 18:35

Hi San,
I am modelling 3-body reactions in FLUENT and I have the same question as you.
If we do not know the third body efficiency, is the default value of 1 ok? Have you found out the answer to your question? If yes, please kindly advise me. Thank you very much.
Jenny

San Siro March 3, 2013 21:09

Hi Jenny
 
Quote:

Originally Posted by Jenny_W (Post 411234)
Hi San,
I am modelling 3-body reactions in FLUENT and I have the same question as you.
If we do not know the third body efficiency, is the default value of 1 ok? Have you found out the answer to your question? If yes, please kindly advise me. Thank you very much.
Jenny

finally i ignore the third body efficiency,and i think the default value of 1 is fine for the simulation.

Jenny_W March 4, 2013 03:46

Hi San,
Thank you very much for your reply.
Do you know how to write a three-body reaction in CHEMKIN mechanism format? How do I incorporate the low and high pressure limits?
Regards,
Jenny

San Siro March 5, 2013 02:54

hi
 
Quote:

Originally Posted by Jenny_W (Post 411269)
Hi San,
Thank you very much for your reply.
Do you know how to write a three-body reaction in CHEMKIN mechanism format? How do I incorporate the low and high pressure limits?
Regards,
Jenny

I think the user's guide of Fluent may help you with that.

hossam_ali June 30, 2013 11:25

third body efficiency in combustion
 
Hi help wanted in combustion simulation by fluent

I have a reaction mechanism includes third body value for argon (Ar). The question is should I include argon in the species of the fuel or the oxidizer or there is no need for that and should I include a mass fraction in the boundary condition for argon.

thanks


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