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

Sources for multiphase multicomponent reaction sys

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 18, 2004, 04:57
Default Sources for multiphase multicomponent reaction sys
  #1
Liwau
Guest
 
Posts: n/a
Dear Specialists,

I have trouble in setting sources for a multiphase multicompoent reaction system. The system likes this: gas + solid; reactions occur in gas phase; mass transfer exists between gas phase and solid phase. Of course, solid phase should be looked as liquid because Euler approach is adopted. When setting Fluid Sources, I don't know how to set the items under the Continuity Frame. Could anybody tell me the guidances? Thanks.

Liwau
  Reply With Quote

Old   May 19, 2004, 00:41
Default Re: Sources for multiphase multicomponent reaction
  #2
test
Guest
 
Posts: n/a
Hi,

Well I am not sure if you are using CFX-5.6 or 5.7! Assuming that you are using 5.6... You are talking of a phasic reaction... The reaction has to b broken down into steps!

1. Devolatilization of volatiles from the solid phase 2. Combustion of volatiles in gas phase 3. Combustion of char left from in the solid phase.

I am not sure what kind of reactor you are looking at.. However you can contact your local CFX support team and ask them to give you an example problem of bio-mass combustion.. It would be difficult to explain you the details in the mail now, since this analysis is very involved. You ahve to create lot of subdomain and define the source term only in the continuity equation.

Let me know if you require further help

  Reply With Quote

Old   May 20, 2004, 11:36
Default Re: Sources for multiphase multicomponent reaction
  #3
Phil
Guest
 
Posts: n/a
The use of multiple subdomains for this type of calculation is now unnecessary in CFX-5.7. There is a new option to respect the specified mass fractions even if the mass source is negative.
  Reply With Quote

Old   May 20, 2004, 23:08
Default Re: Sources for multiphase multicomponent reaction
  #4
tec
Guest
 
Posts: n/a
Dear test:

As your description for this problem, I want to use CFX4 to model the devolatilization of volatiles from the solid phase 2. Should I use User Fortran (which one) and how to deal with the .fc file simulataneously ?

Furthermore, I also need to track the history of solid phase 2 (char) in the flow field.

Thanks for your attention.
  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
Segmentation fault in running alternateSteadyReactingFoam,why? NewKid OpenFOAM 18 January 20, 2011 17:55
reaction in UDF(DEFINE_VR_RATE) louiza FLUENT 3 October 13, 2010 23:59
Reaction help!! Harry CFX 4 October 30, 2008 11:11
Multicomponent Multiphase Reaction Modelling Anirban CFX 0 April 17, 2006 08:51
chemical reaction - decompostition La S. Hyuck CFX 1 May 23, 2001 00:07


All times are GMT -4. The time now is 15:15.