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Title: Generation of excited species in a streamer discharge

Abstract

At or near atmospheric pressure, most transient discharges, particularly in molecular gases or gas mixture containing molecular gases result in a space-charge dominated transport called a streamer discharge. The excited species generation in such discharges forms the basis for plasma chemistry in most technological applications. In this paper we simulate the propagation of streamers in atmospheric pressure N2 to understand the energy partitioning in the formation of various excited species and compare the results to a uniform Townsend discharge. The model is fully two-dimensional with azimuthal symmetry. Results show a significantly larger fraction of the energy goes into vibrational excitation of the N2 ground state in a streamer-type discharge in comparison to a Townsend discharge. For lower applied voltages, the anode-directed (negative) steamer is slightly more efficient in channeling energy for excited species production in comparison to a cathode-directed (positive) streamer. Near 70% overvoltage both types of streamers show very similar energy partitioning but quite different from a Townsend discharge

Authors:
ORCiD logo [1]
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  1. Old Dominion Univ., Norfolk, VA (United States)
Publication Date:
Research Org.:
Old Dominion Univ., Norfolk, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1763630
Alternate Identifier(s):
OSTI ID: 1763785; OSTI ID: 1780688
Grant/Contract Number:  
SC0020183
Resource Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Streamer discharge; Excited species; Atmospheric pressure plasma; Energy balance; Electron impact ionization; Equations of fluid dynamics; Plasma devices; Gas discharges; Streamer discharge, excited species, non-thermal plasma, cold plasma

Citation Formats

Dhali, Shirshak K. Generation of excited species in a streamer discharge. United States: N. p., 2021. Web. doi:10.1063/5.0033110.
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Dhali, Shirshak K. Generation of excited species in a streamer discharge. United States. https://doi.org/10.1063/5.0033110
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Dhali, Shirshak K. Fri . "Generation of excited species in a streamer discharge". United States. https://doi.org/10.1063/5.0033110. https://www.osti.gov/servlets/purl/1763630.
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@article{osti_1763630,
title = {Generation of excited species in a streamer discharge},
author = {Dhali, Shirshak K.},
abstractNote = {At or near atmospheric pressure, most transient discharges, particularly in molecular gases or gas mixture containing molecular gases result in a space-charge dominated transport called a streamer discharge. The excited species generation in such discharges forms the basis for plasma chemistry in most technological applications. In this paper we simulate the propagation of streamers in atmospheric pressure N2 to understand the energy partitioning in the formation of various excited species and compare the results to a uniform Townsend discharge. The model is fully two-dimensional with azimuthal symmetry. Results show a significantly larger fraction of the energy goes into vibrational excitation of the N2 ground state in a streamer-type discharge in comparison to a Townsend discharge. For lower applied voltages, the anode-directed (negative) steamer is slightly more efficient in channeling energy for excited species production in comparison to a cathode-directed (positive) streamer. Near 70% overvoltage both types of streamers show very similar energy partitioning but quite different from a Townsend discharge},
doi = {10.1063/5.0033110},
journal = {AIP Advances},
number = 1,
volume = 11,
place = {United States},
year = {Fri Jan 29 00:00:00 EST 2021},
month = {Fri Jan 29 00:00:00 EST 2021}
}
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https://doi.org/10.1063/5.0033110
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