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

Looking for a code of exact wall heat flux on cylinder enclosure wall

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 9, 2011, 02:56
Default Looking for a code of exact wall heat flux on cylinder enclosure wall
  #1
New Member
 
Join Date: Jan 2011
Posts: 5
Rep Power: 15
ljwbuaa is on a distinguished road
Dear all,
I do the radiative transfer simulation by using the finite volume method. To validate my simulation result, I want to compare it with the exact wall heat flux on cylinder enclosure wall. Where can I download the code of exact wall heat flux on cylinder enclosure wall?

Any kind of suggestion and help are welcome
ljwbuaa is offline   Reply With Quote

Old   January 10, 2011, 07:12
Default
  #2
Senior Member
 
Rami Ben-Zvi
Join Date: Mar 2009
Posts: 155
Rep Power: 17
Rami is on a distinguished road
Quote:
Originally Posted by ljwbuaa View Post
Dear all,
I do the radiative transfer simulation by using the finite volume method. To validate my simulation result, I want to compare it with the exact wall heat flux on cylinder enclosure wall. Where can I download the code of exact wall heat flux on cylinder enclosure wall?

Any kind of suggestion and help are welcome
Hi ljwbuaa,

Not sure I fully understand what the problem is. If you merely solve the radiative equilibrium between the cylinder surfaces (no participating medium within the cylinder), and all walls are gray and diffuse, you may use view factors (differential, if you wish to get the spatial distribution). I also suspect you may find the solution in one of the classics (Siegel & Howell, Sparrow & Cess, Modest), although I have not checked by myself.

If your problem is different, please clarify.

Rami
Rami is offline   Reply With Quote

Old   January 11, 2011, 02:27
Default
  #3
New Member
 
Join Date: Jan 2011
Posts: 5
Rep Power: 15
ljwbuaa is on a distinguished road
Quote:
Originally Posted by Rami View Post
Hi ljwbuaa,

Not sure I fully understand what the problem is. If you merely solve the radiative equilibrium between the cylinder surfaces (no participating medium within the cylinder), and all walls are gray and diffuse, you may use view factors (differential, if you wish to get the spatial distribution). I also suspect you may find the solution in one of the classics (Siegel & Howell, Sparrow & Cess, Modest), although I have not checked by myself.

If your problem is different, please clarify.

Rami
Dear Rami,

Thank for your response. My current research is related to the cylindrical enclosure with an absorbing-emitting but nonscattering medium.
The medium temperature is assumed a constant quantity (T=100K), and the wall is assumed cold (T=0K) and black(emission coefficent=1).
I want to compare the FVM simulation result of the radiative flux on the cylinder wall with the exact solution.So, I need a code of exct solution about cylinder enclosure.
Can you help me? any suggestion are welcome.
ljwbuaa is offline   Reply With Quote

Old   January 13, 2011, 06:51
Default
  #4
Senior Member
 
Rami Ben-Zvi
Join Date: Mar 2009
Posts: 155
Rep Power: 17
Rami is on a distinguished road
Hi ljwbuaa,

I guess you refer to an infinite cylinder. If so, there is an exact solution in a paper by E.H. Chui et al (J Thermophys. Heat Transfer, v6 n4 pp 605-611, 1992, cited by Moder et al, Num Heat Trans, B 30:437-452,1996, cited by us, Ben Zvi et at, Num Heat Trans, B 35:163-183,1999) which may be what you are after. In any case, in Modest's book, there is a section on non-scatering media, with a solution (eq. 8.31 in the 1993 edition). which - I guess may be used to your case to easily reach the solution. Sorry, I am too busy to give you a fully cooked solution...

Good luck,
Rami
Rami is offline   Reply With Quote

Old   January 14, 2011, 04:13
Default
  #5
New Member
 
Join Date: Jan 2011
Posts: 5
Rep Power: 15
ljwbuaa is on a distinguished road
Quote:
Originally Posted by Rami View Post
Hi ljwbuaa,

I guess you refer to an infinite cylinder. If so, there is an exact solution in a paper by E.H. Chui et al (J Thermophys. Heat Transfer, v6 n4 pp 605-611, 1992, cited by Moder et al, Num Heat Trans, B 30:437-452,1996, cited by us, Ben Zvi et at, Num Heat Trans, B 35:163-183,1999) which may be what you are after. In any case, in Modest's book, there is a section on non-scatering media, with a solution (eq. 8.31 in the 1993 edition). which - I guess may be used to your case to easily reach the solution. Sorry, I am too busy to give you a fully cooked solution...

Good luck,
Rami
Dear Rami,

Thank for your constructive suggestions. I will do my best to study it.

Also,I read your paper (Ben Zvi et at, Num Heat Trans, B 35:163-183,1999),your research is excellent.

At the time of coming new year, I wish all the best in your work.

ljw
ljwbuaa is offline   Reply With Quote

Old   January 16, 2011, 09:33
Default
  #6
Senior Member
 
Rami Ben-Zvi
Join Date: Mar 2009
Posts: 155
Rep Power: 17
Rami is on a distinguished road
Thank you for the compliment and wishes, A Happy New Year and good luck!
Rami is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wall Heat Flux & Temperature Greg Perkins FLUENT 10 November 20, 2015 10:32
Heat flux and k-e wall boundary conditions Blob CFX 4 June 8, 2009 06:10
Wall Heat Flux not a listed variable mike CFX 8 February 5, 2009 14:32
wall heat flux or boundary source of energy??? Albi CFX 1 May 4, 2007 12:25
CFX - wall heat flux divarano CFX 2 December 4, 2006 17:14


All times are GMT -4. The time now is 05:18.