Title: Multi-scale dynamics of atmospheric-pressure discharges ignited over liquid electrodes

Journal Article · · Journal of Applied Physics
DOI: https://doi.org/10.1063/1.5132319 · OSTI ID:1802765
ORCiD logo [1];  [2]; ORCiD logo [3]
  1. CFD Research Corp., Huntsville, AL (United States); OSTI
  2. CFD Research Corp., Huntsville, AL (United States)
  3. CFD Research Corp., Huntsville, AL (United States); Univ. of Alabama, Huntsville, AL (United States)

A multiphase computational model of atmospheric-pressure gas discharges ignited over liquid electrodes is developed. The model takes into account both the liquid electrode motion under applied electric fields and plasma generation in the gas phase. The influence of the applied voltage and liquid properties (density, viscosity, and surface tension) on the liquid surface deformation is analyzed. It is shown that the shape of dynamic cones formed on the liquid surface differs from the static Taylor's cones. The influence of the liquid surface protrusions on gas breakdown dynamics is demonstrated. It is shown that the breakdown develops in two stages: first, a fast ionization wave propagates from the cathode to the anode, and then the cathode sheath collapses due to secondary electron emission from the liquid surface. It is shown that dynamics of the multiphase system containing gas, plasma, and liquid states is characterized by three disparate time scales: the fast electron time scale, the intermediate ion time scale, and the slow liquid dynamics time scale.

Research Organization:
CFD Research Corp., Huntsville, AL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0015746
OSTI ID:
1802765
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 127; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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