Artículo
Abstract:
A numerical investigation of the kinetic processes in the initial (nanosecond range) stage of the double-arcing instability was developed. The plasma-sheath boundary region of an oxygen-operated cutting torch was considered. The energy balance and chemistry processes in the discharge were described. It is shown that the double-arcing instability is a sudden transition from a diffuse (glow-like) discharge to a constricted (arc-like) discharge in the plasma-sheath boundary region arising from a field-emission instability. A critical electric field value of ∼107 V/m was found at the cathodic part of the nozzle wall under the conditions considered. The field-emission instability drives in turn a fast electronic-to-translational energy relaxation mechanism, giving rise to a very fast gas heating rate of at least ∼109 K/s, mainly due to reactions of preliminary dissociation of oxygen molecules via the highly excited electronic state O2(B3Σu -) populated by electron impact. It is expected that this fast oxygen heating rate further stimulates the discharge contraction through the thermal instability mechanism. © 2018 Author(s).
Registro:
| Documento: | Artículo |
| Título: | Investigation of the relevant kinetic processes in the initial stage of a double-arcing instability in oxygen plasmas |
| Autor: | Mancinelli, B.; Prevosto, L.; Chamorro, J.C.; Minotti, F.O.; Kelly, H. |
| Filiación: | Grupo de Descargas Eléctricas, Departamento Ing. Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, Venado Tuerto, Santa Fe, 2600, Argentina Universidad Tecnológica Nacional, CONICET, Facultad Regional Venado Tuerto, Departamento Ing. Electromecánica, Grupo de Descargas Eléctricas, Laprida 651, Venado Tuerto, Santa Fe, 2600, Argentina Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Buenos Aires, 1428, Argentina CONICET-Universidad de Buenos Aires, Instituto de Física Del Plasma (INFIP), Buenos Aires, 1428, Argentina |
| Palabras clave: | Electric discharges; Excited states; Field emission; Heating rate; Oxygen; Oxygen cutting; Plasma diagnostics; Plasma sheaths; Thermodynamic stability; Critical electric field; Emission instabilities; Excited electronic state; Fast electronics; Nanosecond range; Numerical investigations; Thermal instabilities; Translational energy; Plasma stability |
| Año: | 2018 |
| Volumen: | 25 |
| Número: | 5 |
| DOI: | http://dx.doi.org/10.1063/1.5032220 |
| Título revista: | Physics of Plasmas |
| Título revista abreviado: | Phys. Plasmas |
| ISSN: | 1070664X |
| CODEN: | PHPAE |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1070664X_v25_n5_p_Mancinelli |
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Citas:
---------- APA ----------
Mancinelli, B., Prevosto, L., Chamorro, J.C., Minotti, F.O. & Kelly, H. (2018) . Investigation of the relevant kinetic processes in the initial stage of a double-arcing instability in oxygen plasmas. Physics of Plasmas, 25(5).http://dx.doi.org/10.1063/1.5032220
---------- CHICAGO ----------
Mancinelli, B., Prevosto, L., Chamorro, J.C., Minotti, F.O., Kelly, H. "Investigation of the relevant kinetic processes in the initial stage of a double-arcing instability in oxygen plasmas" . Physics of Plasmas 25, no. 5 (2018).http://dx.doi.org/10.1063/1.5032220
---------- MLA ----------
Mancinelli, B., Prevosto, L., Chamorro, J.C., Minotti, F.O., Kelly, H. "Investigation of the relevant kinetic processes in the initial stage of a double-arcing instability in oxygen plasmas" . Physics of Plasmas, vol. 25, no. 5, 2018.http://dx.doi.org/10.1063/1.5032220
---------- VANCOUVER ----------
Mancinelli, B., Prevosto, L., Chamorro, J.C., Minotti, F.O., Kelly, H. Investigation of the relevant kinetic processes in the initial stage of a double-arcing instability in oxygen plasmas. Phys. Plasmas. 2018;25(5).http://dx.doi.org/10.1063/1.5032220
