Characteristics of discharge with liquid non-metallic cathode burning in air flow

André, Pascal; Barinov, Yu. A.; Faure, Géraldine; Shkol'nik, S.M.

doi:10.1088/1361-6463/aadfad

Cited by 9 publications

(9 citation statements)

References 29 publications

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“…Low-current discharges in atmospheric-pressure air have been studied in a number of experiments (see recent reviews [32][33][34] and references therein). In most of the experiments, for which current density values j are available [3,[35][36][37][38][39][40][41][42][43][44][45], the current discharge radius was inferred by the emission spectroscopy of the N 2 C state. However, the emission discharge and the current discharge radii may be not equal, and both their radii and their ratios depend on experimental conditions [5,46].…”

Section: Resultsmentioning

confidence: 99%

“…However, the emission discharge and the current discharge radii may be not equal, and both their radii and their ratios depend on experimental conditions [5,46]. As a result, variation of cathode materials (e.g., glow discharges with liquid [35,40,41], plasma [36,37], or metal [3,38,39,[42][43][44][45] cathodes), stabilization modes (with or without tubes and flows as well as swirl versus axial flows [38]), or the electrode gaps and of discharge currents causes a large scatter of discharge parameter data in terms of the current density. In any case, since the C state of N 2 is produced by electron-impact excitation, the available current density values are representative of regions with high electron number density.…”

Section: Resultsmentioning

confidence: 99%

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Modelling of an Atmospheric–Pressure Air Glow Discharge Operating in High–Gas Temperature Regimes: The Role of the Associative Ionization Reactions Involving Excited Atoms

Cejas

Mancinelli

Prevosto

2020

Plasma

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A model of a stationary glow-type discharge in atmospheric-pressure air operated in high-gas-temperature regimes (1000 K < Tg < 6000 K), with a focus on the role of associative ionization reactions involving N(2D,2P)-excited atoms, is developed. Thermal dissociation of vibrationally excited nitrogen molecules, as well as electronic excitation from all the vibrational levels of the nitrogen molecules, is also accounted for. The calculations show that the near-threshold associative ionization reaction, N(2D) + O(3P) → NO+ + e, is the major ionization mechanism in air at 2500 K < Tg < 4500 K while the ionization of NO molecules by electron impact is the dominant mechanism at lower gas temperatures and the high-threshold associative ionization reaction involving ground-state atoms dominates at higher temperatures. The exoergic associative ionization reaction, N(2P) + O(3P) → NO+ + e, also speeds up the ionization at the highest temperature values. The vibrational excitation of the gas significantly accelerates the production of N2(A3∑u+) molecules, which in turn increases the densities of excited N(2D,2P) atoms. Because the electron energy required for the excitation of the N2(A3∑u+) state from N2(X1∑g+, v) molecules (e.g., 6.2 eV for v = 0) is considerably lower than the ionization energy (9.27 eV) of the NO molecules, the reduced electric field begins to noticeably fall at Tg > 2500 K. The calculated plasma parameters agree with the available experimental data.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Modelling of an Atmospheric–Pressure Air Glow Discharge Operating in High–Gas Temperature Regimes: The Role of the Associative Ionization Reactions Involving Excited Atoms

Cejas

Mancinelli

Prevosto

2020

Plasma

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“…The requirement for special gases and problems with scaling render treatment costly and limit conventional NEAPPJs to laboratory studies and research applications. Considering the high price of process gases, the perfect solution would be the development of a high-density plasma jet operated with the flow of natural air; however, the generation of high density and low temperature plasma in ambient air remains challenging [22], [24], [28]- [30]. Several studies reported the development of plasma jets operated with natural air; however, in all the reports, the plasma jets encountered the problems that were discussed above (complex gas flow, low concentrations of RONS, and problems with scaling) and relatively high plasma temperature, thereby resulting in thermal damage to the device [29], [31].…”

Section: Introductionmentioning

confidence: 99%

Development of an Ambient Air Flow Rotating Arc Jet for Low-Temperature Treatment

Gamaleev

Iwata

et al. 2019

IEEE Access

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For low-temperature atmospheric pressure plasma treatment applications, we developed a novel rotating arc jet operated using various gases, including ambient air. We demonstrate the operation of plasma via the injection of various gas mixtures and tune operation parameters to achieve a low-temperature gas output from the arc jet. The rotating arc jet has an efficiency two orders of magnitude higher in the generation of reactive oxygen and nitrogen species than commercially available conventional nonequilibrium atmospheric pressure plasma jets operated with He or Ar gases. The high concentration of reactive species and use of ambient air as a process gas is promising for biomedical and agriculture applications. This work is a step toward the commercial use of plasma jets operated with ambient air. INDEX TERMSReactive oxygen and nitrogen species (RONS), Rotating arc jet, atmospheric-pressure plasmas, UV absorption, Escherichia coli.

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“…A number of experiments have been reported on non-equilibrium regimes of discharges in atmospheric-pressure air, in particular, glow-type discharges in open ambient air (e.g., [1,2,3,4,5,6,7,8,9,10,11,12]), and in fast longitudinal flows of air [13,14]. In [13,14], the parameters of a low-current glow discharge in a high-velocity flow of preliminary heated air ( T 0 = 1800–2900 K) at atmospheric pressure, is investigated.…”

Section: Introductionmentioning

confidence: 99%

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

2019

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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(A3∑u+) 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(A3∑u+) 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(A3∑u+) molecules by O(3P) atoms.

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Characteristics of discharge with liquid non-metallic cathode burning in air flow

Abstract: Conference papers Accès au bibtex titre Calcul de la composition chimique dans un plasma issu de mélanges de PTFE, d'air, de cuivre et de vapeur d'eau dans le cadre d'appareillages de coupure électrique à air

Cited by 9 publications

References 29 publications

Modelling of an Atmospheric–Pressure Air Glow Discharge Operating in High–Gas Temperature Regimes: The Role of the Associative Ionization Reactions Involving Excited Atoms

Modelling of an Atmospheric–Pressure Air Glow Discharge Operating in High–Gas Temperature Regimes: The Role of the Associative Ionization Reactions Involving Excited Atoms

Development of an Ambient Air Flow Rotating Arc Jet for Low-Temperature Treatment

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

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