CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Species Transport model

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 22, 2004, 09:54
Default Species Transport model
  #1
Karthick
Guest
 
Posts: n/a
Hello All

Now I am dealing with Species Transport Model. I am having some doubts. I am having around 8 fluidisation reactions. But corresponding rate exponents, Activation energy, Preexponential factor, mixing law and other parameters, I don't know. All are mostly experiment related aspects. Is there are any sources where I can get all these values?

Also what is the possibility in Species transport model to specify whether the reaction is exothermic or endothermic?

Regards Karthick
  Reply With Quote

Old   April 22, 2004, 10:22
Default Re: Species Transport model
  #2
co2
Guest
 
Posts: n/a
wiht exho or endo i guess you can just do that by changing the sign of energy source term in your zone
  Reply With Quote

Old   April 22, 2004, 11:01
Default Re: Species Transport model
  #3
Karthick
Guest
 
Posts: n/a
Dear co2

How I can specify exothermic and endothermic for each reaction. Totally I am having 8 reactions that has to take place in all the zones. It is just gasification reactions.

Also where I can get the activation energy, preexponential factor, rate exponent values?

Regards Karthick
  Reply With Quote

Old   April 22, 2004, 11:21
Default Re: Species Transport model
  #4
co2
Guest
 
Posts: n/a
NIST has a very good web resource.

http://www.nist.gov/srd/onlinelist.htm

you got to be able to pick up something
  Reply With Quote

Old   April 22, 2004, 11:49
Default Re: Species Transport model
  #5
Allan Walsh
Guest
 
Posts: n/a
Not sure what type of project you are working on, but it sounds like you are just starting out. If you are doing this as a student project, then you can find many sources of kinetic rate data on the Internet with a quick search, which should suffice.

If this is a "real world" project, you probably should know that people spend years or decades trying to get the information needed. More rigorous reaction schemes may involve hundreds of species. Sure, this can be reduced to a simple rate expression, but is it valid for your conditions? Good enough? Takes lots of time to check these things.

Exothermic versus endo depends on what is entered for the heats of formation of reactants and products. Fluent 6.x has lots of stuff built into the database.

A good place to start is by first looking at the documentation, and then asking questions.
  Reply With Quote

Reply

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
questions about species transport through walls shuqin FLUENT 13 April 9, 2014 02:42
Divergence problem for species transport model MY FLUENT 3 January 11, 2014 05:46
species transport model or mixture model? achaokaoyan Main CFD Forum 0 July 10, 2010 10:52
species transport in water lyn FLUENT 1 December 12, 2007 19:15
Can Fluent handle species transport in multi-phase Roger FLUENT 1 January 30, 2003 20:12


All times are GMT -4. The time now is 10:03.