CFD Online Logo CFD Online URL
Home > Forums > FLUENT

finite rate/eddy dissipation model

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   January 2, 2012, 13:21
Default finite rate/eddy dissipation model
Join Date: Oct 2011
Posts: 34
Rep Power: 6
roukaia is on a distinguished road
Hello Everyone,

Could someone inform me how to give input for the pre-exponential factor for a complex mechanism in Fluent? Do I need to convert it from gmol/cm3 to kgmol/m3 with the reaction order as powers or do I specify the value which is given in the literature. or should i keep them const as they are !!
my reaction is c10h22+15.5O2=10co2+11h2O

In the literature the Pre-exponential factor is given as values and all they say is it is consitent with units of concentration (gmol/cm3)^1-m-n where m and n are 1 for an elementary mechanism.

The other problem is that in Fluent when I use the value of Pre-exponential factor as it is (by default), it is working.
any help would be appreciated

Thank you.
roukaia is offline   Reply With Quote

Old   January 3, 2012, 03:39
Join Date: Nov 2011
Location: Czech Republic
Posts: 95
Rep Power: 6
Sixkillers is on a distinguished road
Units of pre-exponential factor should be for Fluent in (kmol/(m^3 * s))^(1-n) (assuming the temperature exponent is zero), where n is an overall reaction order, which is for an elementary reaction sum of stoichiometric coefficients of reactants.
Sixkillers is offline   Reply With Quote

Old   January 3, 2012, 13:57
Default need books
Join Date: Oct 2011
Posts: 34
Rep Power: 6
roukaia is on a distinguished road
thank you for replying
does any one has these books

"simplified reaction mechanisms for oxidation of hydrocarbon fuels in flames" westbook uk and drayer FL 1981

"evaporation and combustion of sprays progress in energy and combu
stion sciences "
my mail is :
roukaia is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
about Subgrid-scale model impecca OpenFOAM Running, Solving & CFD 4 December 20, 2013 11:36
Problems bout CFD model of biomass gasification, Downdraft gasifier wanglong FLUENT 2 November 26, 2009 00:27
LES and combustion model Margherita Cadorin CFX 0 October 29, 2008 06:24
Laminar finite rate combustion model Shankar FLUENT 3 June 24, 2004 15:40
Oldroyd-B model using Finite Difference Luciane Grossi Main CFD Forum 1 July 27, 2000 23:28

All times are GMT -4. The time now is 14:23.