Predicted Anode Arc Attachment by LTE (Local Thermodynamic Equilibrium) and 2-T (Two-Temperature) Arc Models in a Cascaded-Anode DC Plasma Spray Torch
| Autor: | Rodion Zhukovskii, Vincent Rat, Armelle Vardelle, Christophe Chazelas, Ron Molz |
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| Přispěvatelé: | IRCER - Axe 2 : procédés plasmas et lasers (IRCER-AXE2), 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)-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), Oerlikon |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Physics::Instrumentation and Detectors Thermodynamic equilibrium atmospheric plasma spray (APS) chemistry.chemical_element computational fluid dynamics 01 natural sciences [SPI.MAT]Engineering Sciences [physics]/Materials 010305 fluids & plasmas Arc (geometry) Physics::Plasma Physics 0103 physical sciences heat transfer Materials Chemistry electric arc model 010302 applied physics Argon [SPI.PLASMA]Engineering Sciences [physics]/Plasmas [CHIM.MATE]Chemical Sciences/Material chemistry Mechanics torch modeling Condensed Matter Physics Surfaces Coatings and Films Volumetric flow rate Anode Heat flux chemistry Plasma torch Electrode |
| Zdroj: | Journal of Thermal Spray Technology Journal of Thermal Spray Technology, ASM International/Springer, In press, ⟨10.1007/s11666-021-01253-4⟩ Journal of Thermal Spray Technology, ASM International/Springer, 2021, ⟨10.1007/s11666-021-01253-4⟩ |
| ISSN: | 1059-9630 1544-1016 |
| DOI: | 10.1007/s11666-021-01253-4⟩ |
| Popis: | International audience; In DC plasma spray torches, anode erosion is a common concern. It mainly depends on the heat flux brought by the arc and on the dimensions and residence time of the arc attachment to a given location on the anode wall. The latter depend, to a great extent, on the attachment mode of the arc on the anode wall. This paper compares the anode arc attachment modes predicted by an LTE (Local Thermodynamic Equilibrium) and 2-T (two-temperature) arc models that include the electrodes in the computational domain. It deals with a commercial cascaded-anode plasma torch operated at high current (500 A) and low gas flow rate (60 NLPM of argon). It shows that the LTE model predicted a constricted anode arc attachment that moves on the anode ring, while the 2-T model predicted a diffuse and steady arc attachment. The comparison between the predicted and measured arc voltage showed that the 2-T prediction is closer to the actual voltage. Also, the postmortem observation of a new anode ring of the actual plasma torch operated under the same conditions for a short time confirmed a diffuse arc attachment on a new anode. Keywords atmospheric plasma spray (APS) Á torch modeling Á computational fluid dynamics Á electric arc model Á heat transfer This article is an invited paper selected from presentations at the 2021 International Thermal Spray Conference, ITSC2021, that was held virtually May 25-28, 2021 due to travel restrictions related to the coronavirus (COVID-19) pandemic. It has been expanded from the original presentation. |
| Databáze: | OpenAIRE |
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