Effect of Electromagnetic Boundary Conditions on Reliability of Plasma Torch Models
| Autor: | Christophe Chazelas, Bernd Distler, Armelle Vardelle, Vincent Rat, Rodion Zhukovskii |
|---|---|
| Přispěvatelé: | Institut de Recherche sur les CERamiques (IRCER), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IRCER - Axe 2 : procédés plasmas et lasers (IRCER-AXE2), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut des Procédés Appliqués aux Matériaux (IPAM) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Physics::Instrumentation and Detectors atmospheric plasma spray (APS) computational fluid dynamics 7. Clean energy 01 natural sciences 010305 fluids & plasmas law.invention law Physics::Plasma Physics 0103 physical sciences heat transfer Materials Chemistry electric arc model [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering Boundary value problem 010302 applied physics Torch [SPI.PLASMA]Engineering Sciences [physics]/Plasmas modeling Plasma Mechanics torch modeling Condensed Matter Physics Cathode Surfaces Coatings and Films Anode Plasma torch Magnetic potential Electric current |
| Zdroj: | Journal of Thermal Spray Technology Journal of Thermal Spray Technology, ASM International/Springer, 2020, 29 (5), pp.894-907. ⟨10.1007/s11666-020-01052-3⟩ |
| ISSN: | 1059-9630 1544-1016 |
| DOI: | 10.1007/s11666-020-01052-3⟩ |
| Popis: | The cascaded-anode plasma torch makes it possible to get a longer and more stable plasma jet with higher specific enthalpy than conventional plasma torches. It is now used widely, but there are still few models of the cascaded-anode plasma torch. This study developed a 3-D time-dependent model that couples the gas phase and electrodes by encompassing the electromagnetic and heat equations both in the electrodes and gas phase. The model was applied to a commercial plasma spray gun equipped with a single cathode, single cylindrical anode and an inter-electrode insert to fix the average arc length. This paper examines the effect of the boundary conditions for the magnetic vector potential and electric current density on the electromagnetic, velocity and temperature fields of the plasma jet. The model predictions showed that, for such plasma torches where the arc is close to walls, the Biot and Savart formalism is required at the domain boundaries for the magnetic vector potential. They also showed that similar plasma fields could be obtained by imposing an electric current density profile at the cathode tip or by including the electrodes in the computational domain. However, this profile has to be chosen according to the specific design of the cathode, which is not obvious when the cathode has a design different from that of conventional plasma torches with sharp conical tip or rounded tip. |
| Databáze: | OpenAIRE |
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