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

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POTOČŇÁKOVÁ Lucia SYNEK Petr HODER Tomáš

Rok publikování 2020
Druh Článek v odborném periodiku
Časopis / Zdroj Physical Review E
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://journals.aps.org/pre/abstract/10.1103/PhysRevE.101.063201
Doi http://dx.doi.org/10.1103/PhysRevE.101.063201
Klíčová slova viscous droplet; nonthermal plasma; Hele-Shaw cell; instability
Popis 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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