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Title: Plasma-induced flow instabilities in atmospheric pressure plasma jets

Abstract

Pulsed plasma excitation of rare gases flowing into air has been shown to impact the stability of the flow in non-equilibrium atmospheric pressure plasma jets (APPJs). In this paper, the results from a numerical modeling investigation of the stability of a round He APPJ with a powered electrode exposed to the gas flow are discussed. Localized gas heating at the powered electrode occurs on the time scale of the voltage pulse, tens to 100 ns, which is short compared to the fluid timescales. An acoustic wave propagates from this heated, expanding gas and exits the jet. The wave disturbs the shear layer between the He and surrounding humid air, exciting a shear instability which grows downstream with the flow and increases the mixing of the humid air into the He. The effects of the eddy-dominated flow on ionization wave (IW) propagation in an APPJ were investigated. The IW followed the regions of the highest helium concentration, resulting in an increased production of NO, HO 2, and NO 2.

Authors:
 [1];  [1];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1535336
Grant/Contract Number:  
SC0014132
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 11; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics

Citation Formats

Lietz, Amanda M., Johnsen, Eric, and Kushner, Mark J. Plasma-induced flow instabilities in atmospheric pressure plasma jets. United States: N. p., 2017. Web. doi:10.1063/1.4996192.
Lietz, Amanda M., Johnsen, Eric, & Kushner, Mark J. Plasma-induced flow instabilities in atmospheric pressure plasma jets. United States. doi:10.1063/1.4996192.
Lietz, Amanda M., Johnsen, Eric, and Kushner, Mark J. Mon . "Plasma-induced flow instabilities in atmospheric pressure plasma jets". United States. doi:10.1063/1.4996192. https://www.osti.gov/servlets/purl/1535336.
@article{osti_1535336,
title = {Plasma-induced flow instabilities in atmospheric pressure plasma jets},
author = {Lietz, Amanda M. and Johnsen, Eric and Kushner, Mark J.},
abstractNote = {Pulsed plasma excitation of rare gases flowing into air has been shown to impact the stability of the flow in non-equilibrium atmospheric pressure plasma jets (APPJs). In this paper, the results from a numerical modeling investigation of the stability of a round He APPJ with a powered electrode exposed to the gas flow are discussed. Localized gas heating at the powered electrode occurs on the time scale of the voltage pulse, tens to 100 ns, which is short compared to the fluid timescales. An acoustic wave propagates from this heated, expanding gas and exits the jet. The wave disturbs the shear layer between the He and surrounding humid air, exciting a shear instability which grows downstream with the flow and increases the mixing of the humid air into the He. The effects of the eddy-dominated flow on ionization wave (IW) propagation in an APPJ were investigated. The IW followed the regions of the highest helium concentration, resulting in an increased production of NO, HO2, and NO2.},
doi = {10.1063/1.4996192},
journal = {Applied Physics Letters},
number = 11,
volume = 111,
place = {United States},
year = {2017},
month = {9}
}

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Cited by: 18 works
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