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

Conjugate Heat Transfer & Radiation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 10, 2010, 18:19
Default Conjugate Heat Transfer & Radiation
  #1
New Member
 
Join Date: Apr 2010
Posts: 9
Rep Power: 6
hydro is on a distinguished road
I want to model radiation of a solid body in a cht-problem. So i have to use Monte Carlo Model. What i did is setting the transfer mode for the solid domain to participating media, the spectral model to gray and the material properties refractive index, absorption coefficient and scattering coefficient. In the Domain Interface Boundary Details Tab, Thermal Radiation Option is set to Opaque, Emissivity is 0.6, Diffuse Fraction is close to Zero.

As result, i get values for Radiation Intensity, but the temperature of the solid (a 900K steel plate in 300K air domain) does not change in comparison to a calculation without radiation...

What could be wrong? What steps are missing?

Thanks and regards!
hydro is offline   Reply With Quote

Old   May 10, 2010, 19:57
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 9,726
Rep Power: 77
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Quote:
I want to model radiation of a solid body in a cht-problem. So i have to use Monte Carlo Model.
Incorrect. This can also be modelled using the Discrete Transfer approach. Discrete Transfer will work out view factors and is much quicker and easier than Monte Carlo. Don't use Monte Carlo unless you need the path information it provides (ie variable opacity or whatever).

The Monte Carlo model is tricky to get working properly so it does not surprise me you are having problems with it. Discrete Transfer is much easier.
ghorrocks is offline   Reply With Quote

Old   May 11, 2010, 15:55
Default
  #3
New Member
 
Join Date: Apr 2010
Posts: 9
Rep Power: 6
hydro is on a distinguished road
Yes, You are right! I accidently set up the radiation model for the solid domain instead of the fluid domain. Now, both models, the descrete transfer and monte carlo, are working and give nearly same results for the temperature field.

Thanks and regards!
hydro 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
Convective / Conductive Heat Transfer in Hypersonic flows enigma Main CFD Forum 2 November 1, 2009 23:53
Conjugate heat transfer problem hvem10 FLUENT 2 October 29, 2009 19:31
Conjugate heat transfer and radiation modeling questions shankara.2 FLUENT 0 April 21, 2009 16:55
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55
Radiation Heat Transfer The IFRF Heat Transfer Team Main CFD Forum 0 January 31, 2000 15:02


All times are GMT -4. The time now is 02:53.