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Title: Electron kinetic effects in atmospheric dielectric-barrier glow discharges

Abstract

Large-volume atmospheric dielectric-barrier discharges (DBD) are particularly useful for processing applications when they operate in their homogeneous mode. A vast majority of their theoretical studies is currently based on the hydrodynamic treatment in which electrons are assumed to be in equilibrium with the local electric field. Recognizing that this assumption is incorrect in the sheath region, we report the development of an electron-hybrid model to treat electrons kinetically and all other particles hydrodynamically. Through numerical examples, it is shown that the mainstream hydrodynamic model underestimates gas ionization and discharge current. Using the hybrid model, it is demonstrated that variation in the amplitude of the applied voltage does not significantly alter sheath characteristics in terms of the electric field and the electron mean energy. Also gas ionization in atmospheric DBD is found to be significant only over a short timescale of 1 {mu}s. Compared with dc atmospheric pressure glow discharges, atmospheric DBD are shown to have a smaller electron mean energy and a larger sheath thickness.

Authors:
;  [1]
  1. Department of Electronic and Electrical Engineering Loughborough University, Ashby Road, Leicestershire LE11 3TU (United Kingdom)
Publication Date:
OSTI Identifier:
20668298
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 97; Journal Issue: 8; Other Information: DOI: 10.1063/1.1872192; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; ATMOSPHERIC PRESSURE; ELECTRIC FIELDS; ELECTRIC POTENTIAL; ELECTRONS; EQUILIBRIUM; GLOW DISCHARGES; HYBRIDIZATION; HYDRODYNAMIC MODEL; IONIZATION; MONTE CARLO METHOD; PLASMA; PLASMA SHEATH; PLASMA SIMULATION; THICKNESS

Citation Formats

Zhu, X.M., and Kong, M.G. Electron kinetic effects in atmospheric dielectric-barrier glow discharges. United States: N. p., 2005. Web. doi:10.1063/1.1872192.
Zhu, X.M., & Kong, M.G. Electron kinetic effects in atmospheric dielectric-barrier glow discharges. United States. doi:10.1063/1.1872192.
Zhu, X.M., and Kong, M.G. Fri . "Electron kinetic effects in atmospheric dielectric-barrier glow discharges". United States. doi:10.1063/1.1872192.
@article{osti_20668298,
title = {Electron kinetic effects in atmospheric dielectric-barrier glow discharges},
author = {Zhu, X.M. and Kong, M.G.},
abstractNote = {Large-volume atmospheric dielectric-barrier discharges (DBD) are particularly useful for processing applications when they operate in their homogeneous mode. A vast majority of their theoretical studies is currently based on the hydrodynamic treatment in which electrons are assumed to be in equilibrium with the local electric field. Recognizing that this assumption is incorrect in the sheath region, we report the development of an electron-hybrid model to treat electrons kinetically and all other particles hydrodynamically. Through numerical examples, it is shown that the mainstream hydrodynamic model underestimates gas ionization and discharge current. Using the hybrid model, it is demonstrated that variation in the amplitude of the applied voltage does not significantly alter sheath characteristics in terms of the electric field and the electron mean energy. Also gas ionization in atmospheric DBD is found to be significant only over a short timescale of 1 {mu}s. Compared with dc atmospheric pressure glow discharges, atmospheric DBD are shown to have a smaller electron mean energy and a larger sheath thickness.},
doi = {10.1063/1.1872192},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 8,
volume = 97,
place = {United States},
year = {2005},
month = {4}
}