Experimental and theoretical studies of atmospheric glow discharges

This thesis presents the experimental and theoretical studies of nonthermal and stable atmospheric-pressure glow discharges. With the excitation frequency in the kilohertz range, a uniform and stable glow discharge has been successfully produced in atmospheric helium without the usually indispensabl...

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Main Author:	J.J. Shi
Format:	Default Thesis
Published:	2005
Subjects:	Mechanical engineering not elsewhere classified Gas discharges Glow plasmas Atmospheric Fluid model Computational Radio frequency Operation mode Mechanical Engineering not elsewhere classified
Online Access:	https://hdl.handle.net/2134/7982
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id	rr-article-9540320
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spelling	rr-article-95403202005-01-01T00:00:00Z Experimental and theoretical studies of atmospheric glow discharges J.J. Shi (7129856) Mechanical engineering not elsewhere classified Gas discharges Glow plasmas Atmospheric Fluid model Computational Radio frequency Operation mode Mechanical Engineering not elsewhere classified This thesis presents the experimental and theoretical studies of nonthermal and stable atmospheric-pressure glow discharges. With the excitation frequency in the kilohertz range, a uniform and stable glow discharge has been successfully produced in atmospheric helium without the usually indispensable dielectric barrier. For this barrier-free cold atmospheric discharge, there are two discharge events occurring, respectively, in the voltage-rising and the voltage-falling phases, and in general they compete with each other. This distinct feature is illustrated through a detailed fluid simulation. For direct current atmospheric glow discharges, their cathode fall region is shown to depend critically on the discharge current density. For atmospheric glow discharges excited at 13.56 MHz on the other hand, we present observations that after gas breakdown, the discharge evolves from the normal glow mode to the abnormal glow mode and then through the recovery mode back to the normal glow mode. The operation modes, namely the a mode and the y mode, in radio-frequency atmospheric glow discharges are investigated with a one-dimensional, self-consistent continuum model. This model is evaluated by comparing our numerical results with experimental data and other simulation results in literature. It is shown that gas ionization is volumetric in the a mode and localized in the boundary region between the sheath and the bulk plasma in the y mode. The stable operation regime in the a mode is found to have a positive differential conductivity, and can be expanded to higher discharge current density without compensating plasma reactivity by increasing the excitation frequency. Furthermore this plasma stability-reactivity balance is also studied for radio-frequency atmospheric glow microdischarges. 2005-01-01T00:00:00Z Text Thesis 2134/7982 https://figshare.com/articles/thesis/Experimental_and_theoretical_studies_of_atmospheric_glow_discharges/9540320 CC BY-NC-ND 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified Gas discharges Glow plasmas Atmospheric Fluid model Computational Radio frequency Operation mode Mechanical Engineering not elsewhere classified
spellingShingle	Mechanical engineering not elsewhere classified Gas discharges Glow plasmas Atmospheric Fluid model Computational Radio frequency Operation mode Mechanical Engineering not elsewhere classified J.J. Shi Experimental and theoretical studies of atmospheric glow discharges
description	This thesis presents the experimental and theoretical studies of nonthermal and stable atmospheric-pressure glow discharges. With the excitation frequency in the kilohertz range, a uniform and stable glow discharge has been successfully produced in atmospheric helium without the usually indispensable dielectric barrier. For this barrier-free cold atmospheric discharge, there are two discharge events occurring, respectively, in the voltage-rising and the voltage-falling phases, and in general they compete with each other. This distinct feature is illustrated through a detailed fluid simulation. For direct current atmospheric glow discharges, their cathode fall region is shown to depend critically on the discharge current density. For atmospheric glow discharges excited at 13.56 MHz on the other hand, we present observations that after gas breakdown, the discharge evolves from the normal glow mode to the abnormal glow mode and then through the recovery mode back to the normal glow mode. The operation modes, namely the a mode and the y mode, in radio-frequency atmospheric glow discharges are investigated with a one-dimensional, self-consistent continuum model. This model is evaluated by comparing our numerical results with experimental data and other simulation results in literature. It is shown that gas ionization is volumetric in the a mode and localized in the boundary region between the sheath and the bulk plasma in the y mode. The stable operation regime in the a mode is found to have a positive differential conductivity, and can be expanded to higher discharge current density without compensating plasma reactivity by increasing the excitation frequency. Furthermore this plasma stability-reactivity balance is also studied for radio-frequency atmospheric glow microdischarges.
format	Default Thesis
author	J.J. Shi
author_facet	J.J. Shi
author_sort	J.J. Shi (7129856)
title	Experimental and theoretical studies of atmospheric glow discharges
title_short	Experimental and theoretical studies of atmospheric glow discharges
title_full	Experimental and theoretical studies of atmospheric glow discharges
title_fullStr	Experimental and theoretical studies of atmospheric glow discharges
title_full_unstemmed	Experimental and theoretical studies of atmospheric glow discharges
title_sort	experimental and theoretical studies of atmospheric glow discharges
publishDate	2005
url	https://hdl.handle.net/2134/7982
_version_	1796472600290918400

Experimental and theoretical studies of atmospheric glow discharges

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