CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

surface heat transfer coeff of wall flux

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 1, 2016, 09:40
Default surface heat transfer coeff of wall flux
  #1
rsa
New Member
 
Reza
Join Date: Jun 2012
Posts: 27
Rep Power: 14
rsa is on a distinguished road
I have a case where the outer wall of the domain is in contact with the room temperature air. as a boundary condition for this wall I have only used convection where heat transfer coefficient is set to 200 and free stream T to 300 K. Then in the monitor section, I have defined the following monitor:
Report Type: Vertex Avg
Field Variable: Wall Fluxes -> Surface Heat Transfer Coef.

and I have plotted this against "Flow Time". I noticed two things:
1- the magnitude of the "Surface Heat Transfer Coef." is NEGATIVE all the time (the wall initial temperature is 1273 K)
2- the "Surface Heat Transfer Coef." is NOT constant!!! while as I said, in the boundary condition for this wall I have used a constant Heat Transfer Coefficient!

the negative value I imagine is due to the fact that the wall is loosing energy to free stream but can anyone tells me why the Surface Heat Tansfer Coef." monitor is not constant!!!
rsa is offline   Reply With Quote

Reply

Tags
heat flux, heat tranfer coefficient, heat transfer boundary, monitoring boundary

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
Total heat transf. rate vs Total surface heat flux Renato Sousa FLUENT 1 April 14, 2020 03:27
Heat flux and Heat transfer coefficient sakil2k3 FLUENT 4 July 5, 2015 15:07
Heat Flux Wall Boundary Confusion. Joee FLUENT 1 August 21, 2010 12:20
Convective / Conductive Heat Transfer in Hypersonic flows enigma Main CFD Forum 2 November 1, 2009 22:53
surface heat transfer coeff. profile??? alp FLUENT 4 November 10, 2008 03:16


All times are GMT -4. The time now is 09:07.