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| Abstract No.: |
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Scheduled at:
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Wednesday, May 05, 2010, Moor Room 10:40 AM
Modeling and Simulation 2
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| Title: |
Effects of fluid/solid couplings on the plasma flow inside a direct current plasma gun
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| Authors: |
Rodolphe Bolot* / ICB-UBFC, LERMPS-UTBM, France
Alain Allimant / Saint-Gobain CREE, France
Dominique Billières/ Saint-Gobain Coating Solutions, France
Christian Coddet/ LERMPS-UTBM, France
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| Abstract: |
The present study is devoted to the modelling of the arc formation in a direct current plasma gun newly commercialized by Saint-Gobain Coating Solutions (Avignon, France). The CFD computations were performed using the FLUENT code and the electromagnetic coupling was taken into account on the basis of a three dimensional model. The main advances regarding to previous works performed on the same subject are numerous. First of all, whereas most of earlier models developed include the arc region only, the CFD domain was here extended to the gas injection region (i.e. upstream part of the gun), thus allowing a better description of the effect of the gas injection on the plasma flow. Second, whereas earlier works include the fluid domain only, the present model includes a fluid/solid coupling in the anode. In particular, the thermal and electromagnetic equations are solved not only in the fluid parts but also in the tungsten and copper parts of the anode. This change was found to be important because the internal surface of the anode is no more a boundary of the domain. Thus, its temperature (and electric potential) becomes variable and is thus not necessarily imposed. Finally, the implemented model provides interesting results describing the arc behaviour inside the plasma gun.
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