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Abstract:

A numerical investigation of the double-arcing phenomenon in a cutting arc torch is reported. The dynamics of the double-arcing were simulated by using a two-dimensional model of the gas breakdown development in the space-charge layer contiguous to the nozzle of a cutting arc torch operated with oxygen. The kinetic scheme includes ionization of heavy particles by electron impact, electron attachment, electron detachment, electron-ion recombination, and ion-ion recombination. Complementary measurements during double-arcing phenomena were also conducted. A marked rise of the nozzle voltage was found. The numerical results showed that the dynamics of a cathode spot at the exit of the nozzle inner surface play a key role in the raising of the nozzle voltage, which in turn allows more electrons to return to the wall at the nozzle inlet. The return flow of electrons thus closes the current loop of the double-arcing. The increase in the (floating) nozzle voltage is due to the fact that the increased electron emission at the spot is mainly compensated by the displacement current (the ions do not play a relevant role due to its low-mobility) until that the stationary state is achieved and the electron return flow fully-compensates the electron emission at the spot. A fairly good agreement was found between the model and the experiment for a spot emission current growth rate of the order of 7×104A/s. © 2014 AIP Publishing LLC.

Registro:

Documento: Artículo
Título:Numerical investigation of the double-arcing phenomenon in a cutting arc torch
Autor:Mancinelli, B.R.; Minotti, F.O.; Prevosto, L.; Kelly, H.
Filiación:Grupo de Descargas Eléctricas, Departamento Ingeniería Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, (2600) Venado Tuerto (Santa Fe), Argentina
Instituto de Física Del Plasma (CONICET), Departamento de Física, Ciudad Universitaria Pab. i, (1428) Buenos Aires, Argentina
Palabras clave:Computer simulation; Electron emission; Electrons; Impact ionization; Ions; Oxygen cutting; Displacement currents; Electron attachment; Electron detachments; Electron-ion recombinations; Ion-ion recombinations; Numerical investigations; Space-charge layers; Two dimensional model; Nozzles
Año:2014
Volumen:116
Número:2
DOI: http://dx.doi.org/10.1063/1.4887490
Título revista:Journal of Applied Physics
Título revista abreviado:J Appl Phys
ISSN:00218979
CODEN:JAPIA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v116_n2_p_Mancinelli

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Citas:

---------- APA ----------
Mancinelli, B.R., Minotti, F.O., Prevosto, L. & Kelly, H. (2014) . Numerical investigation of the double-arcing phenomenon in a cutting arc torch. Journal of Applied Physics, 116(2).
http://dx.doi.org/10.1063/1.4887490
---------- CHICAGO ----------
Mancinelli, B.R., Minotti, F.O., Prevosto, L., Kelly, H. "Numerical investigation of the double-arcing phenomenon in a cutting arc torch" . Journal of Applied Physics 116, no. 2 (2014).
http://dx.doi.org/10.1063/1.4887490
---------- MLA ----------
Mancinelli, B.R., Minotti, F.O., Prevosto, L., Kelly, H. "Numerical investigation of the double-arcing phenomenon in a cutting arc torch" . Journal of Applied Physics, vol. 116, no. 2, 2014.
http://dx.doi.org/10.1063/1.4887490
---------- VANCOUVER ----------
Mancinelli, B.R., Minotti, F.O., Prevosto, L., Kelly, H. Numerical investigation of the double-arcing phenomenon in a cutting arc torch. J Appl Phys. 2014;116(2).
http://dx.doi.org/10.1063/1.4887490