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

heat transfer project help

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 23, 2005, 07:38
Default heat transfer project help
  #1
muhkiraz
Guest
 
Posts: n/a
I'm working on effect of distance on natural convection between two known sized horizontal copper plates (2mm thick) that are opened to environment. so that air can get in and out between plates. My bottom plate has a fixed temperature at 350K and top wall has a fixed temp. at 323.5K and the surrounding temp of air is 289.7K. My problem here is to calculate the heat flux and the heat transfer coefficient on the bottom plate. i've tried this but i couldn't find out what to enter for reference temp.? in the formula h=q"/(Twall - Tref ). what should i enter in the "reference value" part of the Fluent? is it the bulk temp. between plates or the surrounding temp.?
  Reply With Quote

Old   March 24, 2005, 02:35
Default Re: heat transfer project help
  #2
Fluent user
Guest
 
Posts: n/a
You can try using the average of bottom plate and air temperature.
  Reply With Quote

Old   March 24, 2005, 04:00
Default Re: heat transfer project help
  #3
muhkiraz
Guest
 
Posts: n/a
dear friend thx, actually my project is to make the correction of an experimental analysis by CFD. in the experiment there are two horizontal plates insulated from their outer surface and the bottom plate is heated by resistance(so there is a heat flux through the upper plate ) and capt in a constant temp.in the experimental calculations, surrounding air temp is used in the equation q=h(Twall-Tref). so in fluent i've tried to do the same but i exactly got the half of the experimental results.(all heat flux, heat transfer coefficient and nusselt number is the half of the expected)(is it because there are two faces of the plate so i've to multiple the results by two or something else. Why results are like this you think?). but after your advice i've tried the bulk temp and get the correct nusselt and heat transfer coefficient but heat flux is the same. so to make the correction by experimental result i need a twice of this heat flux. pleeeease help why is it the half of the expected result? it is so urgent!!!
  Reply With Quote

Old   March 30, 2005, 01:41
Default Re: heat transfer project help
  #4
muhkiraz
Guest
 
Posts: n/a
anyone can help me please response to my problem . its really urgent and necessary
  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
Heat transfer coefficient - what is waht Stan FLUENT 20 March 11, 2014 11:42
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Convective / Conductive Heat Transfer in Hypersonic flows enigma Main CFD Forum 2 November 1, 2009 23:53
How can I increase Heat Transfer at Domain Interf? B.Simon CFX 3 October 28, 2008 19:53
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55


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