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

How to Model Heat Pipe

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 26, 2011, 02:16
Default How to Model Heat Pipe
  #1
Member
 
CR-7
Join Date: Jun 2011
Location: Malaysia
Posts: 62
Rep Power: 6
Heat Pipe is on a distinguished road
Hi every one,
Recently I got this type of Heat pipe to do simulation for it as a master work
But I faced some problems, one of them how to create a geometry correctly
by Gambit then export to Fluent to solve it??




please any help to start my work
Heat Pipe is offline   Reply With Quote

Old   August 26, 2011, 06:18
Default
  #2
Member
 
CR-7
Join Date: Jun 2011
Location: Malaysia
Posts: 62
Rep Power: 6
Heat Pipe is on a distinguished road
i'm waiting !!!
Heat Pipe is offline   Reply With Quote

Old   August 27, 2011, 02:13
Default
  #3
Member
 
CR-7
Join Date: Jun 2011
Location: Malaysia
Posts: 62
Rep Power: 6
Heat Pipe is on a distinguished road
then !! No one has any expert
Heat Pipe is offline   Reply With Quote

Old   August 27, 2011, 11:01
Default
  #4
Member
 
CR-7
Join Date: Jun 2011
Location: Malaysia
Posts: 62
Rep Power: 6
Heat Pipe is on a distinguished road
3-Days with No Replay,,,
Why Open Forum !!!
Heat Pipe is offline   Reply With Quote

Old   September 18, 2011, 03:37
Default
  #5
Member
 
CR-7
Join Date: Jun 2011
Location: Malaysia
Posts: 62
Rep Power: 6
Heat Pipe is on a distinguished road
hello
where r the seniors of forum
Heat Pipe is offline   Reply With Quote

Old   September 18, 2011, 14:56
Default
  #6
Senior Member
 
Mohammad
Join Date: Feb 2010
Location: Shiraz, Iran
Posts: 108
Rep Power: 7
m2montazari is on a distinguished road
hi,
please explain more about your problem and dont be angry of the forum! it seems that the only thing you want is a cicular pipe mesh. and it seems that you dont need even a 3d model but only an axissymmetry one. so simply a rectangle with good stretch of nodes near the wall is all you need. if I'm wrong with your problem, just explain more...
yours,
mohammad
m2montazari is offline   Reply With Quote

Old   September 18, 2011, 15:11
Default
  #7
Member
 
CR-7
Join Date: Jun 2011
Location: Malaysia
Posts: 62
Rep Power: 6
Heat Pipe is on a distinguished road
Dear Mohammed I'm not angry but as you know if some-body wants help and no one reply ,,, bad feelings isn't ???

Okay I wanna to know the boundary types zones with gambit
and then how to set up the 2-phase flow for vapor and water
by the way 2-phase r not mixture separated
Heat Pipe is offline   Reply With Quote

Old   September 18, 2011, 15:44
Default
  #8
Senior Member
 
Mohammad
Join Date: Feb 2010
Location: Shiraz, Iran
Posts: 108
Rep Power: 7
m2montazari is on a distinguished road
hi,
OK.
you dont need to specify anything in gambit about the twophase. if I have understood correctly, there is no external boundary between two phase and liquid and vapor are changing there phase continuously. so just make a rectangle in gambit and in fluent you can mark any cell you want and patch their phase volume fraction to zero or one. check that...
yours,
mohammad
m2montazari is offline   Reply With Quote

Old   September 18, 2011, 15:51
Default
  #9
Member
 
CR-7
Join Date: Jun 2011
Location: Malaysia
Posts: 62
Rep Power: 6
Heat Pipe is on a distinguished road
I know friend 2-phase will define with Fluent but which one the best ( VOF-Eulerian),, I mean boundary condition (interface, velocity inlet and mass inlet) etc,, by the way at the evaporator the water will vaporize and flow through the core(inner space) and at the condensation the vapor will condensate and flow through the wick wall ??

this case more complex because heat and mass transfer within the interface !!!
Heat Pipe is offline   Reply With Quote

Old   September 19, 2011, 02:39
Default
  #10
Senior Member
 
Mohammad
Join Date: Feb 2010
Location: Shiraz, Iran
Posts: 108
Rep Power: 7
m2montazari is on a distinguished road
hi,
I think VOF would be better but as fluent cant model vaporization in vof, I think you have no chance but using mixture(as much as I know). you don't need any interface boundary. the walls must be wall and inlet should be massflowinlet or pressure inlet. also if the pipe has infinite length, periodic boundary condition may suit the best to you problem.
be aware of that the evaporation and condensation in fluent is very difficult and I don't have any good suggestion about that. you can cheat that by using cavitation model and setting proper vapor pressure and ... but it is not the a correct procedure.
yours,
mohammad
m2montazari is offline   Reply With Quote

Old   September 19, 2011, 02:49
Default
  #11
Member
 
CR-7
Join Date: Jun 2011
Location: Malaysia
Posts: 62
Rep Power: 6
Heat Pipe is on a distinguished road
Friend,,,
ends of heat pipe connected with end caps so at inlet and outlet at axial and radial is no flow only at interface between water-vapor at evaporator and condenser ,,,, so the mixture mode in not correct choice because water within tube,, vapor within another tube ,,,

its clear now
Heat Pipe 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
Heat Exchanger Model sak2129 FLUENT 2 December 8, 2014 08:28
Need Help on Heat Flux Profile within Pipe Wall mep10jl FLUENT 3 June 6, 2011 17:08
How to explicitly model a heat sink pandora FLUENT 1 August 18, 2010 12:36
UDF for Heat Exchanger model francois louw FLUENT 2 July 16, 2010 02:21
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56


All times are GMT -4. The time now is 23:17.