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Heat transfer problem at nucleate boiling

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Old   July 15, 2010, 17:11
Default Heat transfer problem at nucleate boiling
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Hello,

Im trying to simulate nucleate boiling of an ammonia-water-mixture by fluent 6.3. in a pipe with turbulent flow and eulerian multiphase model. Therefor Im using the udf of the "Nucleate Boiling"-Tutorial by Fluent. For this udf I defined two boundary conditions for the interior wall, one for the solid side (wall) and one for the fluid side (wall-shadow). The mesh on the fluid side got a very fine boundary layer.

My Problem:
The solution doesnt show any heat transfer between wall and fluid. Im sure that material data, entered in fluent and udf, are correct because I tried to iterate the tutorial data with original udf on my mesh in the same way the tutorial do. But no heat transfer occurs.

If there is someone with an idea for solving my problem Im thankful for telling me.

best regards

mrstuebb
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Old   August 13, 2010, 11:57
Default Boiling model
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Khurram
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Hi. I am also trying to simulate the same tutorial case and having the same problem. I even tried to model the same geometry as the tutorial's one and also import the original mesh file in gambit and then exported it again and run the solution. But in all the above cases no heat transfer occured. If you find any answer then please send me at deep_seak@yahoo.com
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Old   January 7, 2011, 12:59
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Hello,

late, but better than never

try to change the wall-shadow and wall-shadow-shadow boundaries of the pipe wall with each other. When I remind correct, it was the failure in my case.
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Old   February 27, 2011, 10:56
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Hamdy
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Sorry, but i have similar problem. Could you plz send me the boiling tutorial on my mail: hamdy.abotaleb@yahoo.com

Thanks
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Old   May 21, 2011, 01:34
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majid sattarcheh
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hi my friend,

if u send for me your udf code i can help u

because i should run it in fluent and i answer to u for your error
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Old   June 12, 2011, 22:08
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Ghaleb
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Hello guyz, Is there a UDF for 3d or the given 2d udf from the tutorials will work on any 3d model. Any idea??
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Old   April 4, 2012, 07:57
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raoudha
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Quote:
Originally Posted by MrStuebb View Post
Hello,

Im trying to simulate nucleate boiling of an ammonia-water-mixture by fluent 6.3. in a pipe with turbulent flow and eulerian multiphase model. Therefor Im using the udf of the "Nucleate Boiling"-Tutorial by Fluent. For this udf I defined two boundary conditions for the interior wall, one for the solid side (wall) and one for the fluid side (wall-shadow). The mesh on the fluid side got a very fine boundary layer.

My Problem:
The solution doesnt show any heat transfer between wall and fluid. Im sure that material data, entered in fluent and udf, are correct because I tried to iterate the tutorial data with original udf on my mesh in the same way the tutorial do. But no heat transfer occurs.

If there is someone with an idea for solving my problem Im thankful for telling me.

best regards

mrstuebb
hello mrstuebb

Im also trying to simulate two phase flow of an ammonia-water-mixture by fluent in vertical tubes, my problem is how to define the materiel properties of water-ammonia mixture, could you help pleaaaase

thank a lot
raoudha
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Old   April 4, 2012, 14:18
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Hi,

as far as I can remember we calculated the material properties according to the volume rates of water and ammonia in the mixture and entered it as one phase into FLUENT. In FLUENT you have the possibility to determine the material properties as a function of temperature.

The properties of vaporization of the mixture were determined in a UDF-function, related to the temperature and pressure of the mixture.

I hope I this will help you!
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Old   April 11, 2012, 08:23
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thank you very much i'll try this, hope it works
best regards
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Old   April 25, 2012, 12:05
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raoudha
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dear MrStuebb

i'm still trying to write the UDF for ammonia-water mixture properties, could you pleaaaaaaaaaaase help me with en example cause it's the first time i deal with UDfs and it seems a little complicated, would you help pleaaase, my mail is " garma_raoudha@yahoo.fr "

with lot of thank
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Old   December 18, 2014, 15:35
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Ahmed F. AL-Neama
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Sorry, but i have similar problem. Could you please send me the boiling tutorial on my mail: ahmad_alniema@yahoo.com

Thanks
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