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@article{1693637,
author = {Šimek, Milan and Hoffer, Petr and Tungli, Ján and Prukner, Václav and Schmidt, Jiří and Bílek, Petr and Bonaventura, Zdeněk},
article_location = {Bristol},
article_number = {6},
doi = {http://dx.doi.org/10.1088/1361-6595/ab87b7},
keywords = {water; micro-discharges; opto-electrical characteristics; phases of water},
language = {eng},
issn = {0963-0252},
journal = {Plasma Sources Science and Technology},
title = {Investigation of the initial phases of nanosecond discharges in liquid water},
url = {https://iopscience.iop.org/article/10.1088/1361-6595/ab87b7},
volume = {29},
year = {2020}
}
TY - JOUR
ID - 1693637
AU - Šimek, Milan - Hoffer, Petr - Tungli, Ján - Prukner, Václav - Schmidt, Jiří - Bílek, Petr - Bonaventura, Zdeněk
PY - 2020
TI - Investigation of the initial phases of nanosecond discharges in liquid water
JF - Plasma Sources Science and Technology
VL - 29
IS - 6
SP - 1-17
EP - 1-17
PB - IOP Publishing Ltd
SN - 09630252
KW - water
KW - micro-discharges
KW - opto-electrical characteristics
KW - phases of water
UR - https://iopscience.iop.org/article/10.1088/1361-6595/ab87b7
L2 - https://iopscience.iop.org/article/10.1088/1361-6595/ab87b7
N2 - In this work, we examine initial phases of micro-discharges produced in deionised water by high-voltage (HV) pulses of nanosecond duration. We apply opto-electrical diagnostics with extremely high temporal (down to 30 ps) as well as spatial (down to 1 mu m) resolution. Frozen interferometric and shadowgraph images show three distinct events. The first, the subcritical ( no-discharge) event, is characterised by periodic perturbations of the index of refraction which depart from the anode surface and are pulled away at the speed of sound as an expanding envelope defined by the shape of the anode tip. One-dimensional hydrodynamic modelling of the subcritical phase under conditions mimicking curvatures of real anode tips reveals basic characteristics of perturbations caused by dynamic balance between the hydrostatic and electrostrictive pressures consistent with experimental observations. The second, the dark or non-luminous discharge event, is characterised by the onset of a few isolated very tiny tree-like structures growing from the anode tip. Depending on the HV amplitude, the initial structures occur with a delay of similar to 2-3 ns after onset of the HV pulse and subsequently expand with average velocity of similar to 1 x 10(5)-2 x 10(5) m s(-1), creating very dense bush-like structures made of thin hair-like filaments in a few nanoseconds. The third, the luminous discharge event, follows (nearly simultaneously) the dark discharge event and unveils much simpler tree-like morphology determined by the extension of non-luminous bush-like structures. Characteristic dimensions of observed events range from about 1 mu m (typical diameter of non-luminous filaments) to tens of micrometres (characteristic diameters of luminous filaments). Furthermore, we address a possible role of microbubbles developing in the anode region due to the periodic HV pulses and verify that the UV-vis-NIR spectrometric signatures of the luminous phase notably change when replacing non-degassed deionised water with degassed.
ER -
ŠIMEK, Milan, Petr HOFFER, Ján TUNGLI, Václav PRUKNER, Jiří SCHMIDT, Petr BÍLEK a Zdeněk BONAVENTURA. Investigation of the initial phases of nanosecond discharges in liquid water. \textit{Plasma Sources Science and Technology}. Bristol: IOP Publishing Ltd, 2020, roč.~29, č.~6, s.~1-17. ISSN~0963-0252. Dostupné z: https://dx.doi.org/10.1088/1361-6595/ab87b7.
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