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

free stream temperature

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 30, 2000, 01:20
Default free stream temperature
  #1
qzhu
Guest
 
Posts: n/a
Please teach me the following question: when I use the tempetature boundary conditions,for example convection wall , free stream temperature is required. Where is the "free stream temperature" ? For example, free stream temperature is a reference temperature in fluid field(indoor)? or,free stream temperature is a reference temperature in fluid field(outdoor)?
  Reply With Quote

Old   November 30, 2000, 08:03
Default Re: free stream temperature
  #2
Angus Duncan
Guest
 
Posts: n/a
The free stream temperature of your problem is the temperature of that fluid which is acting as the sink. For example, in the case of a utility boiler, the free stream temperature can be defined as the mean temp of the water/steam mixture rising in the wall tubes (away from the boundary layer). If no heat were being extracted from the system by this means then the external (environment) temp could be applied e.g. 273K in scotland!

Angus
  Reply With Quote

Old   December 7, 2000, 10:37
Default Re: free stream temperature
  #3
Volker Pawlik
Guest
 
Posts: n/a
Hi,

the free stream temperature is the temp. outside of your domain. It controls the heat transfer by the equation: heat transfer= heat transfer coefficient *(T_wall - T_free)
  Reply With Quote

Old   December 8, 2000, 03:00
Default Re: free stream temperature
  #4
qzhu
Guest
 
Posts: n/a
Thank you for counsel.

My calculation is carrying out well.

  Reply With Quote

Old   December 8, 2000, 03:01
Default Re: free stream temperature
  #5
qzhu
Guest
 
Posts: n/a
Thank you for counsel. My calculation is carrying out well.

  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
High temperature methane+air Peter FLUENT 5 January 26, 2009 18:04
Free Stream BC KP FLUENT 0 February 27, 2006 17:28
Free stream B.C. Lakshmikanth Alluru FLUENT 1 February 9, 2006 23:49
CFX 4.4 New free surface option Viatcheslav Anissimov CFX 0 April 3, 2002 05:27
chemical reaction - decompostition La S. Hyuck CFX 1 May 23, 2001 00:07


All times are GMT -4. The time now is 20:27.