Viscous droplet in nonthermal plasma: Instability, fingering process, and droplet fragmentation

Lucia Potočňáková, Petr Synek, and Tomáš Hoder
Phys. Rev. E 101, 063201 – Published 1 June 2020
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Abstract

The interaction of dielectric barrier discharge plasma and silicone-oil liquid droplet in a Hele-Shaw cell was investigated experimentally employing synchronized optical and electrical time-resolved measurements. Temporal development of the destabilization, stretching, and fragmentation of the plasma-liquid interface was studied for the whole event lifespan. The perturbation wavelength and temporal development of fingering speed, plasma-liquid interface length, mean transferred charge, and fractal dimension of the pattern were determined. Recorded changes in the dissipated mean power show a strong correlation to subsequent stretching of the interface, opening new methodological possibilities for future investigations. Our extensive parametric study shows that oil viscosity and applied voltage amplitude both have a significant impact on the interface evolution. Notably, at relatively high voltages the destabilized interface featured properties noticeably diverging from the theoretical prediction of a known model. We propose an explanation based on the change of the liquid viscosity with increased heating at high applied voltage amplitudes.

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  • Received 4 September 2019
  • Revised 31 March 2020
  • Accepted 7 May 2020

DOI:https://doi.org/10.1103/PhysRevE.101.063201

©2020 American Physical Society

Physics Subject Headings (PhySH)

Interdisciplinary PhysicsFluid DynamicsPlasma Physics

Authors & Affiliations

Lucia Potočňáková*, Petr Synek, and Tomáš Hoder

  • Department of Physical Electronics, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic

  • *nanai@mail.muni.cz
  • hoder@physics.muni.cz

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Issue

Vol. 101, Iss. 6 — June 2020

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