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help is wanted in arrhenius constants units

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Old   March 22, 2013, 13:19
Default help is wanted in arrhenius constants units
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hossam ali
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i am working on combustion problem with cfd using lameiner finite rate and i am wondaring what is the units of arrhenius pre-exponent factor. in the fleuent help they mentioned it is consistant units but i can not understand


plz help , also does the units changed with reaction order in case it is second order or thired order

thank alot
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Old   March 22, 2013, 16:03
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François Grégoire
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http://en.wikipedia.org/wiki/Arrhenius_equation

"The units of the pre-exponential factor are identical to those of the rate constant and will vary depending on the order of the reaction."
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Old   March 23, 2013, 05:26
Default thanks but i need more help
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Quote:
Originally Posted by macfly View Post
http://en.wikipedia.org/wiki/Arrhenius_equation

"The units of the pre-exponential factor are identical to those of the rate constant and will vary depending on the order of the reaction."
dear macfly thanks for ur response, i want to know the units of pre-exponent factor used in fluent for second and third order is it m3/mole or m3/kgmole

if u have example plz help and my email is hossam_ali_71@yahoo.com

fluent help just mentioeb it is consistant units and i understand this but should i put it in m3/mole or m3/kgmole

u can see the window of fluent in the next link

https://www.sharcnet.ca/Software/Flu...g/node1078.htm


thanks alot

Last edited by hossam_ali; March 23, 2013 at 05:44. Reason: put more data
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Old   March 24, 2013, 12:30
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François Grégoire
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Maybe you can just initialize a simulation, plot the pre-exp factor somehow and check the units.

Last edited by macfly; March 24, 2013 at 13:35.
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Old   March 24, 2013, 13:24
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hossam ali
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Quote:
Originally Posted by macfly View Post
Maybe you can just run a simulation and check the units of the pre-exp factor in the postprocessing.

thanks again i will do it but i donot if this option in fluent

thanks
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