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Title: Hydrodynamic model of a dielectric-barrier discharge in pure chlorine

Abstract

A one-dimensional hydrodynamic model of a dielectric-barrier discharge (DBD) in pure chlorine is developed, and the properties of the discharge are modeled. The discharge is excited in an 8-mm-long discharge gap between 2-mm-thick dielectric quartz layers covering metal electrodes. The DBD spatiotemporal characteristics at gas pressures of 15–100 Torr are modeled for the case in which a 100-kHz harmonic voltage with an amplitude of 8 kV is applied to the electrodes. The average power density deposited in the discharge over one voltage period is 2.5–5.8 W/cm{sup 3}. It is shown that ions and electrons absorb about 95 and 5% of the discharge power, respectively. In this case, from 67 to 97% of the power absorbed by electrons is spent on the dissociation and ionization of Cl{sub 2} molecules. Two phases can be distinguished in the discharge dynamics: the active (multispike) phase, which follows the breakdown of the discharge gap, and the passive phase. The active phase is characterized by the presence of multiple current spikes, a relatively high current, small surface charge density on the dielectrics, and large voltage drop across the discharge gap. The passive phase (with no current spikes) is characterized by a low current, large surface chargemore » density on the dielectrics, and small voltage drop across the discharge gap. The peak current density in the spikes at all pressures is about 4 mA/cm{sup 2}. In the multispike phase, there are distinct space charge sheaths with thicknesses of 1.5–1.8 mm and a mean electron energy of 4.3–7 eV and the central region of quasineutral plasma with a weak electric field and a mean electron energy of 0.8–3 eV. The degree of ionization of chlorine molecules in the discharge is ~0.02% at a pressure of 15 Torr and ~0.01% at 100 Torr. The DBD plasma is electronegative due to the fast attachment of electrons to chlorine atoms: e + Cl{sub 2} → Cl + Cl{sup –}. The most abundant charged particles are Cl{sub 2}{sup +} and Cl{sup −} ions, and the degree of ionization during current spikes in the active phase is (4.1–5.5) × 10{sup –7}. The mechanism of discharge sustainment is analyzed. The appearance of a series of current spikes in the active phase of the discharge is explained.« less

Authors:
 [1]
  1. Novosibirsk State University (Russian Federation)
Publication Date:
OSTI Identifier:
22760286
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 43; Journal Issue: 8; Other Information: Copyright (c) 2017 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CHARGE DENSITY; CHLORINE; CHLORINE IONS; CURRENT DENSITY; DIELECTRIC MATERIALS; DISSOCIATION; ELECTRIC FIELDS; ELECTRIC POTENTIAL; ELECTRONS; HYDRODYNAMIC MODEL; HYDRODYNAMICS; IONIZATION; ONE-DIMENSIONAL CALCULATIONS; QUARTZ

Citation Formats

Avtaeva, S. V., E-mail: s-avtaeva@srd.nsu.ru. Hydrodynamic model of a dielectric-barrier discharge in pure chlorine. United States: N. p., 2017. Web. doi:10.1134/S1063780X17080037.
Avtaeva, S. V., E-mail: s-avtaeva@srd.nsu.ru. Hydrodynamic model of a dielectric-barrier discharge in pure chlorine. United States. doi:10.1134/S1063780X17080037.
Avtaeva, S. V., E-mail: s-avtaeva@srd.nsu.ru. Tue . "Hydrodynamic model of a dielectric-barrier discharge in pure chlorine". United States. doi:10.1134/S1063780X17080037.
@article{osti_22760286,
title = {Hydrodynamic model of a dielectric-barrier discharge in pure chlorine},
author = {Avtaeva, S. V., E-mail: s-avtaeva@srd.nsu.ru},
abstractNote = {A one-dimensional hydrodynamic model of a dielectric-barrier discharge (DBD) in pure chlorine is developed, and the properties of the discharge are modeled. The discharge is excited in an 8-mm-long discharge gap between 2-mm-thick dielectric quartz layers covering metal electrodes. The DBD spatiotemporal characteristics at gas pressures of 15–100 Torr are modeled for the case in which a 100-kHz harmonic voltage with an amplitude of 8 kV is applied to the electrodes. The average power density deposited in the discharge over one voltage period is 2.5–5.8 W/cm{sup 3}. It is shown that ions and electrons absorb about 95 and 5% of the discharge power, respectively. In this case, from 67 to 97% of the power absorbed by electrons is spent on the dissociation and ionization of Cl{sub 2} molecules. Two phases can be distinguished in the discharge dynamics: the active (multispike) phase, which follows the breakdown of the discharge gap, and the passive phase. The active phase is characterized by the presence of multiple current spikes, a relatively high current, small surface charge density on the dielectrics, and large voltage drop across the discharge gap. The passive phase (with no current spikes) is characterized by a low current, large surface charge density on the dielectrics, and small voltage drop across the discharge gap. The peak current density in the spikes at all pressures is about 4 mA/cm{sup 2}. In the multispike phase, there are distinct space charge sheaths with thicknesses of 1.5–1.8 mm and a mean electron energy of 4.3–7 eV and the central region of quasineutral plasma with a weak electric field and a mean electron energy of 0.8–3 eV. The degree of ionization of chlorine molecules in the discharge is ~0.02% at a pressure of 15 Torr and ~0.01% at 100 Torr. The DBD plasma is electronegative due to the fast attachment of electrons to chlorine atoms: e + Cl{sub 2} → Cl + Cl{sup –}. The most abundant charged particles are Cl{sub 2}{sup +} and Cl{sup −} ions, and the degree of ionization during current spikes in the active phase is (4.1–5.5) × 10{sup –7}. The mechanism of discharge sustainment is analyzed. The appearance of a series of current spikes in the active phase of the discharge is explained.},
doi = {10.1134/S1063780X17080037},
journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 8,
volume = 43,
place = {United States},
year = {2017},
month = {8}
}