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

heat realease in wall by surface reaction (FLUENT)

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 17, 2006, 17:32
Default heat realease in wall by surface reaction (FLUENT)
  #1
Marie-Anne
Guest
 
Posts: n/a
Hi,

I am confused about which boundary conditions to choose for the wall where a surface reaction that releases heat takes place. If I choose constant temperature, then the fact that the wall should be heated is lost. If I choose zero heat flux, then it heats too much because it is considered as adiabatic. Thanks for any advice or previous experience on that.

Marie-Anne
  Reply With Quote

Old   March 17, 2006, 17:47
Default Re: heat realease in wall by surface reaction (FLU
  #2
Andrew Hayes
Guest
 
Posts: n/a
I believe that would be a constant heat flux bc, as long as your reaction is exothermic. You have to know the heating value of the reaction
  Reply With Quote

Old   March 18, 2006, 01:36
Default Re: heat realease in wall by surface reaction (FLU
  #3
Marie Anne
Guest
 
Posts: n/a
Thanks Andrew but I believe that knowing the enthalpy of formation, fluent computes itself the heat produced by the reaction. I just dont know where this heat goes and how to tell Fluent it heats the wall.

Thank you

Marie Anne
  Reply With Quote

Old   March 18, 2006, 07:59
Default Re: heat realease in wall by surface reaction (FLU
  #4
Andrew Mettler Hayes
Guest
 
Posts: n/a
when you set up the boundary condition for the wall you can set it up as a constant heat flux. you just have to know how much heat is being released. Though, I have never done any reaction stuff. When I do a constant heat flux in fluent I set up a surface in Gambit that I can define as a 'constant heat flux' in Fluent - sort of hard to explain via the net.
  Reply With Quote

Old   March 20, 2006, 10:15
Default Re: heat realease in wall by surface reaction (FLU
  #5
RoM
Guest
 
Posts: n/a
Another option is to use the convection bc with a high htc (>1000). In this case the free stream temperature is almost equal to the outer wall temperature of your domain. This approach is good if you have already measured vaules for outer wall temperature.

RoM
  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
natural convection mehrdadeng CFX 10 February 25, 2011 06:25
Fluent Mesh to OpenFoam: Internal Surface has to be a wall sebastian OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 6 October 21, 2010 05:36
Heat Flux Wall Boundary Confusion. Joee FLUENT 1 August 21, 2010 13:20
Species transport wall surface rxn phillerup Main CFD Forum 0 May 29, 2009 10:38
wall surface reaction Razvan FLUENT 0 April 5, 2005 06:10


All times are GMT -4. The time now is 17:36.