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-   -   How to Model Heat Pipe (http://www.cfd-online.com/Forums/fluent/91905-how-model-heat-pipe.html)

 Heat Pipe August 26, 2011 02:16

How to Model Heat Pipe

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??

http://www.iraqup.com/up/20110826/51...Y_28368876.jpg

please any help to start my work

 Heat Pipe August 26, 2011 06:18

i'm waiting !!!

 Heat Pipe August 27, 2011 02:13

then !! No one has any expert

 Heat Pipe August 27, 2011 11:01

3-Days with No Replay,,,
Why Open Forum !!!

 Heat Pipe September 18, 2011 03:37

hello
where r the seniors of forum

 m2montazari September 18, 2011 14:56

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,

 Heat Pipe September 18, 2011 15:11

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

 m2montazari September 18, 2011 15:44

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,

 Heat Pipe September 18, 2011 15:51

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 !!!

 m2montazari September 19, 2011 02:39

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,

 Heat Pipe September 19, 2011 02:49

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

 shahid nadeem December 15, 2015 05:37

Quote:
 Originally Posted by Heat Pipe (Post 324611) 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
Hello friend i am working on the same analysis. Did you got how to do it. I am doing a 3D analysis of heat pipe i am in need of a UDF

Thank You

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