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Abstract:

Low-frequency (100 Hz), intermediate-current (50 to 200 mA) glow discharges were experimentally investigated in atmospheric pressure air between blunt copper electrodes. Voltage-current characteristics and images of the discharge for different inter-electrode distances are reported. A cathode-fall voltage close to 360 V and a current density at the cathode surface of about 11 A/cm2, both independent of the discharge current, were found. The visible emissive structure of the discharge resembles to that of a typical low-pressure glow, thus suggesting a glow-like electric field distribution in the discharge. A kinetic model for the discharge ionization processes is also presented with the aim of identifying the main physical processes ruling the discharge behavior. The numerical results indicate the presence of a non-equilibrium plasma with rather high gas temperature (above 4000 K) leading to the production of components such as NO, O, and N which are usually absent in low-current glows. Hence, the ionization by electron-impact is replaced by associative ionization, which is independent of the reduced electric field. This leads to a negative current-voltage characteristic curve, in spite of the glow-like features of the discharge. On the other hand, several estimations show that the discharge seems to be stabilized by heat conduction; being thermally stable due to its reduced size. All the quoted results indicate that although this discharge regime might be considered to be close to an arc, it is still a glow discharge as demonstrated by its overall properties, supported also by the presence of thermal non-equilibrium. © 2015 AIP Publishing LLC.

Registro:

Documento: Artículo
Título:On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime
Autor:Prevosto, L.; Kelly, H.; Mancinelli, B.; Chamorro, J.C.; Cejas, E.
Filiación:Grupo de Descargas Eléctricas, Departamento Ing. Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, Venado Tuerto, Santa Fe, 2600, Argentina
Instituto de Física Del Plasma (CONICET), Facultad de Ciencias Exactas y Naturales (UBA), Ciudad Universitaria Pab. i, Buenos Aires, 1428, Argentina
Palabras clave:Atmospheric pressure; Cathodes; Current voltage characteristics; Electric fields; Electrodes; Glow discharges; Heat conduction; Impact ionization; Ionization; Ionization of gases; Low temperature production; Associative ionization; Atmospheric pressure air; Atmospheric pressure air glow discharges; Cathode fall voltage; Electric field distributions; Nonequilibrium plasmas; Thermal non-equilibrium; Voltage-current characteristics; Electric discharges
Año:2015
Volumen:22
Número:2
DOI: http://dx.doi.org/10.1063/1.4907661
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_v22_n2_p_Prevosto

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Citas:

---------- APA ----------
Prevosto, L., Kelly, H., Mancinelli, B., Chamorro, J.C. & Cejas, E. (2015) . On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime. Physics of Plasmas, 22(2).
http://dx.doi.org/10.1063/1.4907661
---------- CHICAGO ----------
Prevosto, L., Kelly, H., Mancinelli, B., Chamorro, J.C., Cejas, E. "On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime" . Physics of Plasmas 22, no. 2 (2015).
http://dx.doi.org/10.1063/1.4907661
---------- MLA ----------
Prevosto, L., Kelly, H., Mancinelli, B., Chamorro, J.C., Cejas, E. "On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime" . Physics of Plasmas, vol. 22, no. 2, 2015.
http://dx.doi.org/10.1063/1.4907661
---------- VANCOUVER ----------
Prevosto, L., Kelly, H., Mancinelli, B., Chamorro, J.C., Cejas, E. On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime. Phys. Plasmas. 2015;22(2).
http://dx.doi.org/10.1063/1.4907661