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Toroidal plasmoid generation via extreme hydrodynamic shear.


ABSTRACT: Saint Elmo's fire and lightning are two known forms of naturally occurring atmospheric pressure plasmas. As a technology, nonthermal plasmas are induced from artificially created electromagnetic or electrostatic fields. Here we report the observation of arguably a unique case of a naturally formed such plasma, created in air at room temperature without external electromagnetic action, by impinging a high-speed microjet of deionized water on a dielectric solid surface. We demonstrate that tribo-electrification from extreme and focused hydrodynamic shear is the driving mechanism for the generation of energetic free electrons. Air ionization results in a plasma that, unlike the general family, is topologically well defined in the form of a coherent toroidal structure. Possibly confined through its self-induced electromagnetic field, this plasmoid is shown to emit strong luminescence and discrete-frequency radio waves. Our experimental study suggests the discovery of a unique platform to support experimentation in low-temperature plasma science.

SUBMITTER: Gharib M 

PROVIDER: S-EPMC5715769 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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Toroidal plasmoid generation via extreme hydrodynamic shear.

Gharib Morteza M   Gharib Morteza M   Mendoza Sean S   Rosenfeld Moshe M   Beizai Masoud M   Alves Pereira Francisco J FJ  

Proceedings of the National Academy of Sciences of the United States of America 20171116 48


Saint Elmo's fire and lightning are two known forms of naturally occurring atmospheric pressure plasmas. As a technology, nonthermal plasmas are induced from artificially created electromagnetic or electrostatic fields. Here we report the observation of arguably a unique case of a naturally formed such plasma, created in air at room temperature without external electromagnetic action, by impinging a high-speed microjet of deionized water on a dielectric solid surface. We demonstrate that tribo-e  ...[more]

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