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Modeling multiple regimes/regions in boiling of a fluid

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Old   February 1, 2017, 01:30
Default Modeling multiple regimes/regions in boiling of a fluid
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Adil Syyed
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I want to model boiling of water in a tube. The tube has a shell around it with circulating pressurized hot water.
Water enters with a fixed mass flow rate with subcooled temperature into the tube and gets heated to the point of saturation temperature. Boiling starts and the entire fluid is converted into steam, This steam is heated to superheated temperature before leaving the tube at the other end.

This problem has subcooled, saturation and superheated regions. Can CFX model such a problem?
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Old   February 1, 2017, 06:52
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Glenn Horrocks
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Yes, CFX can model this. Have a look at the tutorials on the ANSYS customer website for some examples.
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Old   March 19, 2017, 23:18
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Quote:
Originally Posted by ghorrocks View Post
Yes, CFX can model this. Have a look at the tutorials on the ANSYS customer website for some examples.
I tried looking for the tutorial that does this or the example of it, and I couldn't find it.

Can you help, please?

Namely, the problem that I am trying to model is a little bit different in that I don't have any flow (i.e. water isn't coming in and then leaving).

It is literally, me trying to simulate a small pot of water, boiling.

I don't know what the saturation points are, so I am not sure how I should be setting up the multiphase material specification.

Any hints would be greatly appreciated.

Thank you.
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Old   March 20, 2017, 18:43
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Glenn Horrocks
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If you cannot find examples suitable for you then contact ANSYS support as they have zillions more examples available.
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Old   March 20, 2017, 21:47
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Quote:
Originally Posted by ghorrocks View Post
If you cannot find examples suitable for you then contact ANSYS support as they have zillions more examples available.
Sorry, I found out how to do it after the fact. Found online that there's a CCL boiling water template that you can use.

Don't quite fully understand everything/all of its elements, but I'll continue digging/doing more research to gain some knowledge about it.

The basic answer is that in the fluid domain model, you can add multiple materials, which is the short answer to the question.

The long answer is, as they say, lies in the details (which I currently don't know/understand enough) to address.

But thank you for your help.
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Old   March 21, 2017, 05:01
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Yes, there is a CCL template for it. But using it appropriately is not straight forward, and knowing when it is an is not applicable is the key. Hence the recommendation to get examples from ANSYS support.
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