The effect of liquid target on a nonthermal plasma jet - Imaging, electric fields, visualization of gas flow and optical emission spectroscopy

V.V. Kovačević, G.B. Sretenović, E.T. Slikboer, O. Guaitella, A. Sobota, M.M. Kuraica

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Abstract

The article describes the complex study of the interaction of a helium plasma jet with distilled water and saline. The discharge development, spatial distribution of the excited species, electric field measurement results and the results of the Schlieren imaging are presented. The results of the experiments showed that the plasma-liquid interaction could be prolonged with the proper choice of the gas composition between the jet nozzle and the target. This depends on the gas flow and the target distance. Increased conductivity of the liquid does not affect the discharge properties significantly. An increase of the gas flow enables an extension of the plasma duration on the liquid surface up to 10 μs, but with a moderate electric field strength in the ionization wave. In contrast, there is a significant enhancement of the electric field on the liquid surface, up to 30 kV cm-1 for low flows, but with a shorter time of the overall plasma liquid interaction. Ignition of the plasma jet induces a gas flow modification and may cause turbulences in the gas flow. A significant influence of the plasma jet causing a mixing in the liquid is also recorded and it is found that the plasma jet ignition changes the direction of the liquid circulation.

Original languageEnglish
Article number065202
Number of pages15
JournalJournal of Physics D: Applied Physics
Volume51
Issue number6
DOIs
Publication statusPublished - 14 Feb 2018

Funding

VK, GS and AS would like to thank the COST Action TD1208 for financial support for a short-term scientific mission. The authors from University of Belgrade would like to thank to the Ministry of Education and Science of the Republic of Serbia for financial support through Project 171034 and Project 33022. This work has also been partially funded by LABEX Plas@par receiving financial aid from the French National Research Agency (ANR) under the references ANR-11-IDEX-0004-0, and ANR-16-CE06-0005.

Keywords

  • electric field
  • emission spectroscopy
  • helium plasma jet
  • liquid target
  • plasma-liquid interaction
  • Schlieren imaging
  • Stark polarization spectroscopy

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