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Open AccessArticle

Electrical Properties of Reversed-Polarity Ball Plasmoid Discharges

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Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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Author to whom correspondence should be addressed.
Plasma 2020, 3(3), 92-102; https://doi.org/10.3390/plasma3030008
Received: 18 May 2020 / Revised: 19 June 2020 / Accepted: 23 June 2020 / Published: 29 June 2020
Ball plasmoid discharges are a unique type of atmospheric-pressure plasma discharge with a lifetime on the order of a hundred milliseconds without attachment to a power source. These discharges are generated by a moderate current pulse over the surface of an aqueous electrolyte, and some consider the spherical plasmoid that results to bear some resemblance to ball lightning. This article presents the first analysis of the electrical properties of ball plasmoid discharges in a reversed-polarity configuration, i.e., with the central electrode serving as the anode rather than as the cathode. These experiments demonstrate that ball plasmoids can indeed be generated with either electrode polarity with similar observable properties. These results are contrary to what has previously been discussed in the literature and raise additional questions regarding formation mechanisms of ball plasmoids. Analysis of images and electrical measurements collected at various discharge energies show that two distinct processes occur during discharges with our circuitry and in this reversed-polarity configuration: the formation of spark channels between the anode and electrolyte, and the generation of streamers and a jet from the surface of the anode.
Keywords: ball plasmoids; atmospheric-pressure plasma; electrical properties ball plasmoids; atmospheric-pressure plasma; electrical properties
MDPI and ACS Style

Dubowsky, S.E.; Rose, A.N.; Glumac, N.G.; McCall, B.J. Electrical Properties of Reversed-Polarity Ball Plasmoid Discharges. Plasma 2020, 3, 92-102.

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