Direct current micro-plasmas in the non-homogeneous electric field are analyzed over a wide pressure range using the self-consistent two-dimensional axisymmetric fluid model. We observe that the breakdown voltage is not the unique function of Pd, where P is the gas pressure and d is the interelectrode spacing, but also depends on the aspect ratio d/r, where r is the anode radius. This result agrees with the data reported in the literature. For fixed d, we find two modes of ionization wave propagation on the right branch of the breakdown curve: an axial streamer mode that is obtained at low pressures and a hollow streamer mode obtained at high pressures. By varying the ballast resistance connected to the anode, we analyze the steady-state parameters of the micro-discharge for the cathode–anode gap of 200 μm. We obtain normal and sub-normal glow modes of the micro-discharge operation. The instability of the latter mode is analyzed.
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21 December 2020
Research Article|
December 16 2020
Computational analysis of gas breakdown modes in direct current micro-plasmas at elevated pressures
Special Collection:
Fundamentals and Applications of Atmospheric Pressure Plasmas
Dmitry Levko
;
Dmitry Levko
a)
1
Esgee Technologies Inc.
, Austin, Texas 78746, USA
a)Author to whom correspondence should be addressed: [email protected]
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Laxminarayan L. Raja
Laxminarayan L. Raja
2
Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin
, Austin, Texas 78712, USA
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the Special Topic on Fundamentals and Applications of Atmospheric Pressure Plasmas.
J. Appl. Phys. 128, 233301 (2020)
Article history
Received:
October 06 2020
Accepted:
November 29 2020
Citation
Dmitry Levko, Laxminarayan L. Raja; Computational analysis of gas breakdown modes in direct current micro-plasmas at elevated pressures. J. Appl. Phys. 21 December 2020; 128 (23): 233301. https://doi.org/10.1063/5.0031983
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