On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime
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 v...
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todo:paper_1070664X_v22_n2_p_Prevosto2023-10-03T16:02:34Z On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime Prevosto, L. Kelly, H. Mancinelli, B. Chamorro, J.C. Cejas, E. 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 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. Fil:Kelly, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1070664X_v22_n2_p_Prevosto |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
Prevosto, L. Kelly, H. Mancinelli, B. Chamorro, J.C. Cejas, E. |
| author_facet |
Prevosto, L. Kelly, H. Mancinelli, B. Chamorro, J.C. Cejas, E. |
| author_sort |
Prevosto, L. |
| title |
On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime |
| title_short |
On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime |
| title_full |
On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime |
| title_fullStr |
On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime |
| title_full_unstemmed |
On the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime |
| title_sort |
on the physical processes ruling an atmospheric pressure air glow discharge operating in an intermediate current regime |
| url |
http://hdl.handle.net/20.500.12110/paper_1070664X_v22_n2_p_Prevosto |
| work_keys_str_mv |
AT prevostol onthephysicalprocessesrulinganatmosphericpressureairglowdischargeoperatinginanintermediatecurrentregime AT kellyh onthephysicalprocessesrulinganatmosphericpressureairglowdischargeoperatinginanintermediatecurrentregime AT mancinellib onthephysicalprocessesrulinganatmosphericpressureairglowdischargeoperatinginanintermediatecurrentregime AT chamorrojc onthephysicalprocessesrulinganatmosphericpressureairglowdischargeoperatinginanintermediatecurrentregime AT cejase onthephysicalprocessesrulinganatmosphericpressureairglowdischargeoperatinginanintermediatecurrentregime |
| _version_ |
1782026801401298944 |