CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

a laminar circular-tube heat transfer problem

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

LinkBack Thread Tools Search this Thread Display Modes
Old   April 28, 2003, 05:55
Default a laminar circular-tube heat transfer problem
Posts: n/a
i want to simulate the two-phase laminar flow and heat transfer in the circular tube,and i firstly test the mesh and fluent calculating ability by using single phase(water).I have written udf of the inlet velocity for the laminar flow(that is U=2Um*(1-(r/R)^2)),and the final result of pressure drop is exactly in agreement with the theory.

But the problem is that the heat transfer Nu deviates from the theoretical value( Nu=4.366 for Constant Flux ,and Nu=3.67 for constant wall temperature,remember?)(by the way,i also have written udf for the inlet temperature ,and i surely got a fully-developed flow)?

what may be the reasons?any advices are much appreciated!
  Reply With Quote

Old   April 28, 2003, 05:59
Default Re: a laminar circular-tube heat transfer problem
Posts: n/a
is it possible that Fluent does not solve the energy equation exactly?

  Reply With Quote


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
Conjugate heat transfer problem with porous media piko Siemens 1 April 17, 2009 15:41
transient heat transfer problem kamal FLUENT 2 June 29, 2008 14:55
Heat Transfer problem (two different fluids) Jon FLUENT 5 February 20, 2008 06:56
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 15:55
conjugate heat transfer problem Andreas Siemens 0 February 5, 2002 08:00

All times are GMT -4. The time now is 07:14.