CFD Online Logo CFD Online URL
Home > Forums > CFX

Thermal conductivity in porous materiale II

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

LinkBack Thread Tools Display Modes
Old   June 16, 2004, 08:28
Default Thermal conductivity in porous materiale II
Posts: n/a
Cfx 4.4 - Steady state

In my domain I have a gas in a channel and a fraction of the channel is porous (graphite).

In porous zone I'm using porosity weighted conductivity.




I calculated


If I set 125W/(m*K)(using USRCND) in porous zone, but gas temperature increase abnormally in this zone (about 430C instead 353C expected).




  Reply With Quote

Old   June 17, 2004, 22:44
Default Re: Thermal conductivity in porous materiale II
Posts: n/a
If I use porosity weighting with your numbers, I get 50.3 W/m-K. But I don't think even an error in conductivity should increase the final temperature, only get it there faster. If there are heat sources somewhere else in the model, this heat will only be conducted "faster" through the media, resulting in a higher penetration into the media as well. Still the peak temp. shouldn't change. Do you have some sources somewhere that are unaccounted for?

  Reply With Quote

Old   June 21, 2004, 04:18
Default Re: Thermal conductivity in porous materiale II
Posts: n/a
I'm using 50W/m-K (but I made a mistake in the previous message)

I don't have heat sources but I have (in a zone of the porous material) a mass source of one of the mass fraction...

Can this source cause a sensitive temperature change?

  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
Effective Thermal Conductivity Merlin CFX 2 July 23, 2015 07:10
Lack of local thermal equilibrium in porous medium Chander CFX 4 March 4, 2012 05:07
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
Thermal conductivity in porous media Andrea CFX 4 August 5, 2004 16:12
Porous Media Effective Thermal Conductivity Greg Perkins FLUENT 3 August 5, 2001 21:53

All times are GMT -4. The time now is 05:19.