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-   -   help is wanted in arrhenius constants units (https://www.cfd-online.com/Forums/fluent/115063-help-wanted-arrhenius-constants-units.html)

 hossam_ali March 22, 2013 13:19

help is wanted in arrhenius constants units

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

 macfly March 22, 2013 16:03

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."

 hossam_ali March 23, 2013 05:26

thanks but i need more help

Quote:
 Originally Posted by macfly (Post 415795) 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

 macfly March 24, 2013 12:30

Maybe you can just initialize a simulation, plot the pre-exp factor somehow and check the units.

 hossam_ali March 24, 2013 13:24

Quote:
 Originally Posted by macfly (Post 416019) 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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