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Old   February 26, 2001, 11:45
Default Boiling in CFX
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Richard Harrison
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I am trying to model boiling in a small channel with a constant fluid velocity and a heated wall. However, try as I might I can't get the model to boil. I have looked over both of the boiling examples and I can not see why mine won't work. I have tried changing fluid velocity to both high and low Reynolds numbers. I have also tried increasing the wall temperature to see if I just didn't have enough heat.

The simplified model I am attempting is vary similar to the example in the manual but mine just won't work. It runs through the solver fine and the flow profile and temperature profile in the channel look reasonable but no boiling occurs.

I was hoping someone has had some experience with this type of problem and can give me some pointers on what I might be doing wrong.

Thanks in advance!

R. Harrison Utah State University
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Old   February 27, 2001, 04:17
Default Re: Boiling in CFX
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Jan Rusås
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Hi , I have used the boiling model, and it did boil.

What is the temperature and pressure? are you close to saturation?

For testing - try to set your inlet temperature close to the saturation temperature and increase your wall heat flux. Then something should happen for sure.

regards Jan
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Old   March 12, 2001, 10:56
Default Re: Boiling in CFX
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Sascha
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The boiling model of CFX-4 is very difficult to get any converged solution. If your problem is defined with a fluid almost at saturation and the heat flux is sufficiently high it shall boil when you have forced the code to converge....

Myself I have stopped to work with the boiling model of CFX-4 and I have implemented my own and this is really working under all conditions including film condensation, homogenous boiling, cavitation...

sascha
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Old   December 6, 2012, 11:54
Default help regarding the boling and condensation process
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sharon
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hi could you please kindly help me the process to be done in boiling and condensation in cfx, cause my project is on heat pipe.If you can help me i will be obliged.If so please kindly mail me at sharon340mech@yahoo.com
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Old   December 6, 2012, 22:30
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Erik
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The last post was over a decade ago, I doubt they are still checking this. Also you have not asked a question in your post.
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Old   December 7, 2012, 01:14
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sharon
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thank you evcelica for your kind response ..would you please guide me regarding my problem ...
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