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radiative cooling of the fluid (Ar)?

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Old   August 30, 2012, 04:14
Default radiative cooling of the fluid (Ar)?
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Niko Kivel
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Hi FOAMers

I'm a beginner in CFD and OpenFOAM in particular.
Yet I managed to implement and solve a problem of an Ar-plasma being extracted into a vacuum chamber. The solution is stable, but the temperature seems to high.
Short description:
A vacuum chamber is held at 150 Pa and has an opening with a fixed pressure a 1 atm. The mesh is axi-symetric.
The Ar-plasma is defined to be 5000 K and is not really a plasma, it's just hot Ar.
A nice supersonic jet is forming in the vacuum.
The problem with the jet is a more or less constant temperature. The hot Ar should cool down due to the radiation. But, I have no glue how to implement that into the definitions for rhoCentralFoam.

Any ideas howto implement radiative cooling of the fluid?

cheers
Niko
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Old   August 30, 2012, 09:16
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Olivier
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hello,

You might take a look at http://www.tfd.chalmers.se/~hani/pdf...aLicThesis.pdf
You will find details about the radiation loss and enthalpy.
However this is not vanilla OpenFoam, so you 'll have your hand dirty.

regards,
olivier
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Old   August 30, 2012, 09:23
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Niko Kivel
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Quote:
Originally Posted by olivierG View Post
Yep, found that one already. But, for a chemist, that's a lot of physics.

I was hoping for a simpler solution to the problem. But if there is nothing "vanilla" around, I guess I have to bury that project.

cheers
Niko
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Old   August 30, 2012, 09:51
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Olivier
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hello,

There is not such solver in OpenFoam, but all the piece are here:
- add radiation to rhoCentralFoam (look at a similar solver bluid with)
- then add the "plasma specific" properties

good luck !
regards,
olivier
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