CFD Online Logo CFD Online URL
Home > Forums > FLUENT

solid surface's emissivity

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

LinkBack Thread Tools Display Modes
Old   December 21, 2005, 06:25
Default solid surface's emissivity
jarno brunetti
Posts: n/a
I have meshed adiacents fluid and solid regions, separates by wall and wall-shadow boundary zones. Where must I specify the solid surface's emissivity? I have seen that there is an "internal emissivity" coefficient" under wall and wall-shadow boundary panel; there is also a "absorption coeffcient" under solid materials panel, but I don't know if these coefficients are these that I'm finding. Thanks

  Reply With Quote

Old   December 22, 2005, 22:51
Default Re: solid surface's emissivity
Posts: n/a
I am also puzzled by these two coeffcient ...but they have different unit. At present,I think absorption coefficent can be use as semi-transparent material .and set a series of coefficent for non-gray material. One of these coefficent should be his emissivity at his body temperature. those is my opinion .you are wellcome to discuss about it.
  Reply With Quote

Old   December 23, 2005, 05:54
Default Re: solid surface's emissivity
Posts: n/a
Thanks for your response. I have read the discussion that you can find at:, and I think that suggested strategy should be correct. Solid region doesn't take part in radiation because it's its boundary surfaces that absorbs the radiation emitted by C02 and H20 (methane-air combustion case). Radiation heat is transferred, by conduction, across the solid. In this moment I'm trying these strategy and I 'll soon expose the results of simulation. Best regards

  Reply With Quote


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
How model radiation of both solid wall and fluid£¿ Harry Qiu FLUENT 2 February 4, 2013 00:04
Defining Solid Zones Not working elmcmaster FLUENT 3 May 22, 2009 07:14
Multiple Solid Domains - Interfaces Scott CFX 8 July 31, 2008 15:20
solid surface's emissivity jarno brunetti FLUENT 0 December 21, 2005 05:51
CFX4.3 -build analysis form Chie Min CFX 5 July 12, 2001 23:19

All times are GMT -4. The time now is 04:38.