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

conjugate heat transfer with phase change

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 22, 2011, 11:53
Default conjugate heat transfer with phase change
  #1
New Member
 
Neil Yang
Join Date: Mar 2011
Posts: 6
Rep Power: 6
mogoko is on a distinguished road
Hi to all,
I'm simulating conjugate heat transfer with phase change. A cold fluid flows in outer pipe, and a hot fluid flows in inner pipe, a solid domain conducts the heat flow between them. The cold fluid will be heated to evaporate.
Both the inlet velocities are quite low, so I set the flow as laminar.
However, the solution couldn't come to convergence.
Then I tried to set the flow as turbulence, the solution could convergence well, but there was a new problem that the heat transfer solution looked bad. The cold fluid could not evaporate however I changed both the inlet conditions. And the monitor which I set before indeed kept at an invariant liquid volume fraction value of 1.
What the cause of these problems? Mesh? Phase change model?
Thank..
mogoko is offline   Reply With Quote

Old   March 22, 2011, 22:34
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,929
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Sounds like you should build up your model one bit at a time. You have a number of complex systems and you need to get them working well by themselves before they will work together.

I would model the evaporating cold fluid by itself and make sure that works reliably before I added CHT and the hot fluid.
ghorrocks is offline   Reply With Quote

Old   March 23, 2011, 12:25
Default
  #3
New Member
 
Neil Yang
Join Date: Mar 2011
Posts: 6
Rep Power: 6
mogoko is on a distinguished road
Um, before this I've made a simple simulation with evaporation only. I tried both particle model and mixture model which both came to a good solution. Then I made a conjugate heat transfer simulation without phase change, it also performed well. However, once I conjugated fluid and solid, problems came out.
mogoko is offline   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
Conjugate heat transfer problem hvem10 FLUENT 2 October 29, 2009 18:31
conjugate heat transfer with Workbench 12 gbon CFX 0 September 4, 2009 12:52
Conjugate heat transfer for film-cooled flat plate Michele FLUENT 0 July 3, 2006 08:42
Conjugate heat transfer (vs) periodic boundary mp FLUENT 1 January 13, 2003 02:38
help needed about phase change Yanhu Guo Main CFD Forum 4 January 24, 2001 00:16


All times are GMT -4. The time now is 19:49.