Generation of excited species in a streamer discharge

Dhali, Shirshak K.

doi:10.1063/5.0033110

Generation of excited species in a streamer discharge

Journal Article · Fri Jan 29 04:00:00 EST 2021 · AIP Advances

DOI:https://doi.org/10.1063/5.0033110· OSTI ID:1763630

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Old Dominion Univ., Norfolk, VA (United States); Old Dominion University

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.

View Accepted Manuscript (DOE)

Research Organization:: Old Dominion Univ., Norfolk, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0020183

OSTI ID:: 1763630

Alternate ID(s):: OSTI ID: 1763785
OSTI ID: 1780688

Journal Information:: AIP Advances, Journal Name: AIP Advances Journal Issue: 1 Vol. 11; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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