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

Heat Exchanger...TWO

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 9, 2005, 17:47
Default Heat Exchanger...TWO
  #1
Walid
Guest
 
Posts: n/a
Hi,

I am a new CFX user and the only version that I can use is CFX 5.5.1. I have posted a question on this forum last month with title: Heat exchanger. I received a number of replies but none of them seems to answer the question.

I would be grateful if any one has a previous experience in simulation of heat exchanger condenser can help me on this. Please, see to the previous question on Wed, 22 Jun 2005, 5:09 p.m. for details.

Below I show the reference case and CFX result for a heat exchanger tube;

Design case as reference;

Tube lenght is 8 m Tin=70'C Tout=85'C Tube Diameter is .02 m Wall Temperature (fixed) is 90'C

CFX result;

Tube lenght is 8 m Tin=70'C Tout=90'C Tube Diameter is .02 m Wall Temperature (fixed) is 90'C

I noticed the fluid reaches the wall temperature before passing 1/3 of tube length which contradicts the design data.

Is this reasonable result from CFX? Or I have made a mistake somewhere?

I appreciate any help…
  Reply With Quote

Old   July 10, 2005, 19:59
Default Re: Heat Exchanger...TWO
  #2
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

Sounds like you need to do some reading into wall heat transfer modelling. Have a look at some heat transfer validation studies (the CFX Community has some available for download) and textbooks - Turbulence Modelling for CFD by Wilcox is a good one.

Glenn Horrocks
  Reply With Quote

Old   July 11, 2005, 20:04
Default Re: Heat Exchanger...TWO
  #3
Walid
Guest
 
Posts: n/a
Dear Glenn Horrocks,

Thank you for your advice and for previous reply, I have already covered the topic theoretically but the simulation results are a bit weird. I will try to find some previous studies.

Thnaks

Walid
  Reply With Quote

Reply


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
Heat Exchanger Model sak2129 FLUENT 3 September 26, 2017 02:29
Macro Heat Exchanger not selecting (Please help!) zdeth FLUENT 2 September 11, 2012 14:52
UDF for Heat Exchanger model francois louw FLUENT 2 July 16, 2010 03:21
Heat Exchanger Simulation tightaznbreaka FLUENT 0 March 18, 2010 16:45
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55


All times are GMT -4. The time now is 06:43.