A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas

H-containing low-temperature plasmas are used in a wide range of industrial applications. In recent decades, efforts have been made to understand and improve the performance of these plasmas, mainly when operated at low and medium pressures. Studies of hydrogen-containing plasmas at atmospheric pres...

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Main Authors:	Ding-Xin Liu, Xiao-Hua Wang, Zhi-Zhen Ma, Ming-Zhe Rong, Michael G. Kong, Felipe Iza
Format:	Default Article
Published:	2013
Subjects:	Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified
Online Access:	https://hdl.handle.net/2134/16395
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id	rr-article-9568523
record_format	Figshare
spelling	rr-article-95685232013-01-01T00:00:00Z A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas Ding-Xin Liu (7205108) Xiao-Hua Wang (1267368) Zhi-Zhen Ma (7214396) Ming-Zhe Rong (7205114) Michael G. Kong (7128488) Felipe Iza (1258965) Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified H-containing low-temperature plasmas are used in a wide range of industrial applications. In recent decades, efforts have been made to understand and improve the performance of these plasmas, mainly when operated at low and medium pressures. Studies of hydrogen-containing plasmas at atmospheric pressure, however, are scarce despite the potential advantage of operation in a vacuum-free environment. Here the chemistry of low-temperature atmospheric-pressure He + H plasmas is studied by means of a global model that incorporates 20 species and 168 reactions. It is found that for a fixed average input power the plasma density decreases sharply when the H concentration is higher than ∼0.2%, whereas the atomic H density peaks at a H concentration of ∼2%. Operation at larger H concentrations leads to lower plasma densities and lower H concentrations because at high H concentrations significant power is dissipated via vibrational excitation of H and there is an increasing presence of negative ions (H). Key plasma species and chemical processes are identified and reduced sets of reactions that capture the main physicochemical processes of the discharge are proposed for use in computationally demanding models. The actual waveform of the input power is found to affect the average density of electrons, ions and metastables but it has little influence on the density of species requiring low energy for their formation, such as atomic hydrogen and vibrational states of hydrogen. © 2013 IOP Publishing Ltd. 2013-01-01T00:00:00Z Text Journal contribution 2134/16395 https://figshare.com/articles/journal_contribution/A_theoretical_insight_into_low-temperature_atmospheric-pressure_He_H2_plasmas/9568523 CC BY-NC-ND 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified
spellingShingle	Mechanical engineering not elsewhere classified untagged Mechanical Engineering not elsewhere classified Ding-Xin Liu Xiao-Hua Wang Zhi-Zhen Ma Ming-Zhe Rong Michael G. Kong Felipe Iza A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas
description	H-containing low-temperature plasmas are used in a wide range of industrial applications. In recent decades, efforts have been made to understand and improve the performance of these plasmas, mainly when operated at low and medium pressures. Studies of hydrogen-containing plasmas at atmospheric pressure, however, are scarce despite the potential advantage of operation in a vacuum-free environment. Here the chemistry of low-temperature atmospheric-pressure He + H plasmas is studied by means of a global model that incorporates 20 species and 168 reactions. It is found that for a fixed average input power the plasma density decreases sharply when the H concentration is higher than ∼0.2%, whereas the atomic H density peaks at a H concentration of ∼2%. Operation at larger H concentrations leads to lower plasma densities and lower H concentrations because at high H concentrations significant power is dissipated via vibrational excitation of H and there is an increasing presence of negative ions (H). Key plasma species and chemical processes are identified and reduced sets of reactions that capture the main physicochemical processes of the discharge are proposed for use in computationally demanding models. The actual waveform of the input power is found to affect the average density of electrons, ions and metastables but it has little influence on the density of species requiring low energy for their formation, such as atomic hydrogen and vibrational states of hydrogen. © 2013 IOP Publishing Ltd.
format	Default Article
author	Ding-Xin Liu Xiao-Hua Wang Zhi-Zhen Ma Ming-Zhe Rong Michael G. Kong Felipe Iza
author_facet	Ding-Xin Liu Xiao-Hua Wang Zhi-Zhen Ma Ming-Zhe Rong Michael G. Kong Felipe Iza
author_sort	Ding-Xin Liu (7205108)
title	A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas
title_short	A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas
title_full	A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas
title_fullStr	A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas
title_full_unstemmed	A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas
title_sort	theoretical insight into low-temperature atmospheric-pressure he+h2 plasmas
publishDate	2013
url	https://hdl.handle.net/2134/16395
_version_	1798282819437330432

A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas

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