Plasmastream Heating of a Sample in CFX

ChristianGermany · May 21, 2015, 10:58

Hello guys and girls,

I have a problem to which I tried some stuff with Ansys Fluent, but I don´t get it or maybe I have taken the wrong route to it.

This is the problem I am trying to solve in ANSYS Fluent. I have a plasmastream source with a diameter of about 20 mm, at 1 bar and a temperature of 2500 K which streams at a sample holder with about 0,5 kg/s. (For simulation purposes I could assume that it is just air with 2500K) This hits a round cylindrical Sample Holder which consists of a ceramic (0.1 W/m² thermal conductivity) and a sample (10 W/m²) inside the ceramic middle part so that it "sees" the stream. I propably have convection outside of the ceramic, since the stream flows around the sample and heat is radiated from the ceramic and the sample to the outside air at 300K.

If possible, could someone maybe give me some advice on how I could simulate that problem in Fluent or CFX ? Thank you very much !

Best Regards
Christian

ghorrocks · May 21, 2015, 18:46

The air only version of this simulation is straight forward - a CHT simulation with a compressible gas flow. As the plasma in this case does not appear to have much in the way of electric field effects and appears to be just a fast flow you may be able to use some modified EOS to account for some plasma effects - not sure on that, you would have to investigate.

But CFX and Fluent can do this sort of simulation. Do the tutorials which are provided with the software to get a feel for how the basics are done and go from there.

May 21, 2015, 10:58	Plasmastream Heating of a Sample in CFX	#1
ChristianGermany New Member Join Date: May 2015 Posts: 4 Rep Power: 10	Hello guys and girls, I have a problem to which I tried some stuff with Ansys Fluent, but I don´t get it or maybe I have taken the wrong route to it. This is the problem I am trying to solve in ANSYS Fluent. I have a plasmastream source with a diameter of about 20 mm, at 1 bar and a temperature of 2500 K which streams at a sample holder with about 0,5 kg/s. (For simulation purposes I could assume that it is just air with 2500K) This hits a round cylindrical Sample Holder which consists of a ceramic (0.1 W/m² thermal conductivity) and a sample (10 W/m²) inside the ceramic middle part so that it "sees" the stream. I propably have convection outside of the ceramic, since the stream flows around the sample and heat is radiated from the ceramic and the sample to the outside air at 300K. If possible, could someone maybe give me some advice on how I could simulate that problem in Fluent or CFX ? Thank you very much ! Best Regards Christian

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May 21, 2015, 18:46		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The air only version of this simulation is straight forward - a CHT simulation with a compressible gas flow. As the plasma in this case does not appear to have much in the way of electric field effects and appears to be just a fast flow you may be able to use some modified EOS to account for some plasma effects - not sure on that, you would have to investigate. But CFX and Fluent can do this sort of simulation. Do the tutorials which are provided with the software to get a feel for how the basics are done and go from there.