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-   -   radiative cooling of the fluid (Ar)? (http://www.cfd-online.com/Forums/openfoam/106481-radiative-cooling-fluid-ar.html)

niko.kivel August 30, 2012 04:14

radiative cooling of the fluid (Ar)?
 
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

olivierG August 30, 2012 09:16

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

niko.kivel August 30, 2012 09:23

Quote:

Originally Posted by olivierG (Post 379511)

Yep, found that one already. But, for a chemist, that's a lot of physics. :o

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

olivierG August 30, 2012 09:51

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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