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Old   September 13, 2005, 01:41
Default simulation of plasma field
  #1
Ralf Schmidt
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Hi,

at the moment I am thinking about the simulation of a gas flow (air) through a plasma field. Has anyone experience with this kind of simulation? Is it possible in Fluent /Gambit to model?

What about the air leaving the plasma field, it might be ozone or O3... are there material data available in the fluent data base for that medium??

Thanks for your help in advanced! Ralf

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Old   September 13, 2005, 11:44
Default Re: simulation of plasma field
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Razvan
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As much as I know,

PLASMA = ionized gas (cold or hot)

so you can easily create a plasma field, you got the positive ions (and negative where exist) for all major gases in materials panel. All you have to do then is choose a specific composition and temperature for it.

For the start, I think you can try PDF model, using air as "fuel". It is the most elegant solution (you don't have to provide a reaction mechanism) but I can't guarantee it would be quite correct !!

I can't think of anything else right now.

Best wishes, Razvan
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Old   September 14, 2005, 02:14
Default Re: simulation of plasma field
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Ralf Schmidt
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Hi,

thanks for your response, but I am not so sure, what u mean with a PDF model... How does it work and what are the boundary conditions to be used in this model?

Ralf
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Old   September 14, 2005, 12:44
Default Re: simulation of plasma field
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Razvan
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When I said PDF model, I meant non-premixed combustion model (the one that uses PDF functions to determine composition for a particular mixture in specific conditions of reactant concentration and temperature, instead of reaction mechanism). This model is based on the assumption "mixed-is-burned", which means that reaction speed is infinite and composition is completely controlled by turbulent mixing of reactants (this is quite valid for fast burning species).

Now, if your plasma is hot, then there will occure some reactions between plasma and air, of course depending on plasma composition. The ions in plasma field are very reactive chemical species (if I'm not wrong!), so reaction kinetics will be very fast, allowing you to use this PDF-based model.

For setting up and boundary conditions you will find everything you need in doc files.

Best wishes, Razvan
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Old   September 14, 2005, 19:50
Default Re: simulation of plasma field
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Mike Marcu
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Dear Razvan

I'm trying to simulate the heat transfer from an unltraviolet lamp . The inside of the lamp is plasma - a mixture of Argon and Mercury at cca 0.1 torr but having the mind boggling temperature of 5000K.

I need the thermal properties of this plasma- the density, the Cp, the conduction coefficient etc -for conduction I found something like

Lambda= ro x Cp x a where ro is the density, Cp is the specific heat at constant pressure and a is the thermo difussivity but I was unable to go further.

Please help if you can.

con best regardi Mike Marcu
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Old   September 15, 2005, 02:44
Default Re: simulation of plasma field
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Razvan
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I will be working on this. Just have a little patience, OK?

Razvan
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Old   September 15, 2005, 12:25
Default Re: simulation of plasma field
  #7
Mike Marcu
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Thank You
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