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

Heterogeneous Reaction Simulation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 10, 2013, 11:44
Smile Heterogeneous Reaction Simulation
  #1
Member
 
刘峰
Join Date: Mar 2013
Posts: 31
Rep Power: 4
Liufeng_ustb is on a distinguished road
Hi, all
I need your help.
I wanna simulate a gas-solid heterogeneous reaction using FLUENT.
My conditions are as follows:
The gas phase is a mixture consist of 3 species and the solid phase is as well a mixture consist of 2 species. Now, one specie in the gas phase is going to react with the one in the solid phase. Besides, the products are two which are in two different phases respectively. For the purpose of illustration, this reaction can be expressed: A(g)+B(s)=C(g)+D(s).
I already know, the heterogeneous reaction rate is defined with UDF in phase interaction option. However, Species Model also allow us to choose reactions. I am a little confused, because even though i do not choose reaction in specie model(only enable species transport), i can still define reaction in phase interaction.
so, my question is whether i should active volumatric reaction or not in specie model?
thank you all, expect your valuable advice!
Liufeng_ustb is offline   Reply With Quote

Old   May 10, 2013, 17:15
Default
  #2
Senior Member
 
A CFD free user's Avatar
 
A-A Azarafza
Join Date: Jan 2013
Posts: 187
Rep Power: 4
A CFD free user is on a distinguished road
Hey buddy
There's a tutorial in FLUENT something about CVD (chemical vapor deposition). you can refer it and learn how to handle your model, because it's sort of similar to your model. But, if your reactions is not an Arrhenius one, you need to write your own UDF.
__________________
Regard yours
A CFD free user is offline   Reply With Quote

Old   May 10, 2013, 22:33
Default
  #3
Member
 
刘峰
Join Date: Mar 2013
Posts: 31
Rep Power: 4
Liufeng_ustb is on a distinguished road
Quote:
Originally Posted by A CFD free user View Post
Hey buddy
There's a tutorial in FLUENT something about CVD (chemical vapor deposition). you can refer it and learn how to handle your model, because it's sort of similar to your model. But, if your reactions is not an Arrhenius one, you need to write your own UDF.
Hello, Azarafza.
I guess the example provided by tutorial is "A rotating disk CVD reactor for the growth of Gallium Arsenide (GaAs)" Right?
However, my model is Eulerian Multiphase Model.
My aim is to simulate gas flow through a porous solid region. (The region which is formed by many spherical particles can be initialized by using patch. Besides, by applying Eulerian Multiphase Model, I can realize define the diameter of particles)
If I do as what this CVD does, it seems to be impossible to set the diameter of solid particle.
As you mentioned above, my heterogeneous reaction rate can not be expressed by Arrhenius formula. So I need to write my own UDF.
Now, because it's 10 am in China, I just do calculation again.
Some trouble bothers me again. When I turn off my heterogeneous reaction, the calculation can run successfully, but once I enable my heterogeneous reaction and define the rate using my own udf, it is of divergence.
I do not if you are of interested in my model. If you are, I can tell your more details.
I am a senior at college, meanwhile i am a novice in CFD code.
My tutor arranged this task for me, but he is also not good at this kind of problem.
Thanks for reading my long reply!
Best wishes!
Liufeng_ustb is offline   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
Reaction simulation in Fluent ankur_kr FLUENT 3 May 28, 2013 17:51
Discrete event simulation vs. fixed time (discrete time simulation) jenjon FLUENT 0 March 10, 2013 07:58
Simulation and Optimisation of centrifugal fan 3D to 2D eRzBeNgEl STAR-CCM+ 0 January 31, 2013 14:21
in cfx4,aerosol simulation in reaction? S. Ding CFX 0 June 19, 2002 22:31
chemical reaction - howto Dan Sorensen CD-adapco 1 February 21, 2000 10:20


All times are GMT -4. The time now is 22:20.