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

How to ?: Chemical decompostion

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 4, 2000, 16:40
Default How to ?: Chemical decompostion
  #1
Wolfgang Schmidt
Guest
 
Posts: n/a
Hello,

I'm wondering how to set up a simple chemical decompostion of a first order type like C1->B, without any density changes and all is one phase flow without any temperature dependence of the reaction-rate. I was exploring the shareware version 1.5 and tried the simple chemical source model using the term COVAL(CHSO,C1,GRND7,0.0) in the Group 13 section and using RSG3=RSG4=1. I thought this should give a first order decompostion of species C1 to B. But I'm afraid that I'm not understanding the terms in the help file correctly. The use of the above mentioned terms should yield a reaction rate like dC1/dt=-rsg3*C1**rsg4=-rsg3*C1. When I used these terms in a 2D-laminar simulation, the reaction rate whas some orders of magnitude to small -even taking the laminar flow profile into account. An exponential decay of C1 should occure like C1_L=CIN*exp(-rsg3*L/UIN), where L is the axial coordinate and UIN,CIN are the inlet velocity, concentration. If anybody needs for some advice the q1 file I used , I would like to mail this file to him/her.

Thanks in advance

Wolfgang
  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
CFD and Chemical Engineering tai CD-adapco 0 July 3, 2008 00:33
chemical equilibrium George Main CFD Forum 5 October 3, 2007 06:29
chemical engineer ejz Main CFD Forum 10 March 29, 2006 00:22
CFD in chemical engg. shiyak Main CFD Forum 5 June 30, 2005 01:58
domain decompostion doubtsingrid Main CFD Forum 0 March 8, 2003 02:43


All times are GMT -4. The time now is 05:43.