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Open AccessArticle

Glow Discharge in a High-Velocity Air Flow: The Role of the Associative Ionization Reactions Involving Excited Atoms

1
Grupo de Descargas Eléctricas, Departamento Ingeniería Electromecánica, Facultad Regional Venado Tuerto, Universidad Tecnológica Nacional, Laprida 651, 2600 Venado Tuerto, Santa Fe, Argentina
2
Grupo de Descargas Eléctricas, Departamento Ingeniería Electromecánica, Facultad Regional Venado Tuerto, Universidad Tecnológica Nacional, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Laprida 651, 2600 Venado Tuerto, Santa Fe, Argentina
*
Author to whom correspondence should be addressed.
Materials 2019, 12(16), 2524; https://doi.org/10.3390/ma12162524
Received: 5 June 2019 / Revised: 14 June 2019 / Accepted: 18 June 2019 / Published: 8 August 2019
(This article belongs to the Special Issue Atmospheric Pressure Plasmas in Material Science)
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Abstract

A kinetic scheme for non-equilibrium regimes of atmospheric pressure air discharges is developed. A distinctive feature of this model is that it includes associative ionization with the participation of N(2D, 2P) atoms. The thermal dissociation of vibrationally excited nitrogen molecules and the electronic excitation from all the vibrational levels of the nitrogen molecules are also accounted for. The model is used to simulate the parameters of a glow discharge ignited in a fast longitudinal flow of preheated (T0 = 1800–2900 K) air. The results adequately describe the dependence of the electric field in the glow discharge on the initial gas temperature. For T0 = 1800 K, a substantial acceleration in the ionization kinetics of the discharge is found at current densities larger than 3 A/cm2, mainly due to the N(2P) + O(3P) → NO+ + e process; being the N(2P) atoms produced via quenching of N2(A3u+) molecules by N(4S) atoms. Correspondingly, the reduced electric field noticeably falls because the electron energy (6.2 eV) required for the excitation of the N2(A3u+) state is considerably lower than the ionization energy (9.27 eV) of the NO molecules. For higher values of T0, the associative ionization N(2D) + O(3P) → NO+ + e process (with a low–activation barrier of 0.38 eV) becomes also important in the production of charged particles. The N(2D) atoms being mainly produced via quenching of N2(A3u+) molecules by O(3P) atoms. View Full-Text
Keywords: glow discharge; air kinetic scheme; non-equilibrium discharge glow discharge; air kinetic scheme; non-equilibrium discharge
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cejas, E.; Mancinelli, B.R.; Prevosto, L. Glow Discharge in a High-Velocity Air Flow: The Role of the Associative Ionization Reactions Involving Excited Atoms. Materials 2019, 12, 2524.

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