Account of near-cathode sheath in numerical models of high-pressure arc discharges
| Autor: | Mario D. Cunha, Larissa G. Benilova, Dirk Uhrlandt, Margarita Baeva, Mikhail S. Benilov, N A Almeida |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Physics Acoustics and Ultrasonics High-pressure arcs Near-electrode phenomena Mechanics Plasma Numerical models Arc-cathode interaction Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Surfaces Coatings and Films Electronic Optical and Magnetic Materials Power (physics) Arc (geometry) Faculdade de Ciências Exatas e da Engenharia Physics::Plasma Physics High pressure 0103 physical sciences Cathode sheath Poisson's equation Space-charge sheaths |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| ISSN: | 1361-6463 0022-3727 |
| DOI: | 10.1088/0022-3727/49/21/215201 |
| Popis: | Three approaches to describing the separation of charges in near-cathode regions of high-pressure arc discharges are compared. The first approach employs a single set of equations, including the Poisson equation, in the whole interelectrode gap. The second approach employs a fully non-equilibrium description of the quasi-neutral bulk plasma, complemented with a newly developed description of the space-charge sheaths. The third, and the simplest, approach exploits the fact that significant power is deposited by the arc power supply into the near-cathode plasma layer, which allows one to simulate the plasma–cathode interaction to the first approximation independently of processes in the bulk plasma. It is found that results given by the different models are generally in good agreement, and in some cases the agreement is even surprisingly good. It follows that the predicted integral characteristics of the plasma–cathode interaction are not strongly affected by details of the model provided that the basic physics is right. |
| Databáze: | OpenAIRE |
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