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Title: A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas
Authors: Liu, Ding-Xin
Wang, Xiao-Hua
Ma, Zhi-Zhen
Rong, Ming-Zhe
Kong, Michael G.
Iza, Felipe
Issue Date: 2013
Publisher: © IOP Publishing Ltd
Citation: LIU, D.-X. ... et al, 2013. A theoretical insight into low-temperature atmospheric-pressure He+H2 plasmas. Plasma Sources Science and Technology, 22 (5), 055016.
Abstract: 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.
Description: This article was published in the journal, Plasma Sources Science and Technology [© IOP Publishing Ltd]. The definitive version is available at: http://dx.doi.org/10.1088/0963-0252/22/5/055016
Sponsor: This work was supported by the Fundamental Research Funds for the Central Universities of China, the State Key Laboratory of Electrical Insulationand Power Equipment (No. EIPE11108 and EIPE12301) and the Engineering Physical Science Research Council (UK).
Version: Accepted for publication
DOI: 10.1088/0963-0252/22/5/055016
URI: https://dspace.lboro.ac.uk/2134/16395
Publisher Link: http://dx.doi.org/10.1088/0963-0252/22/5/055016
ISSN: 1009-0630
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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