Optical Emission Spectroscopy of Underwater Spark Generated by Pulse High-Voltage Discharge with Gas Bubble Assistant

0565856 - ÚFP 2023 RIV CH eng J - Journal Article
Stelmashuk, Vitaliy - Prukner, Václav - Koláček, Karel - Tuholukov, Andrii - Hoffer, Petr - Štraus, Jaroslav - Frolov, Oleksandr - Jirásek, Vít
Optical Emission Spectroscopy of Underwater Spark Generated by Pulse High-Voltage Discharge with Gas Bubble Assistant.
Processes. Roč. 10, č. 8 (2022), č. článku 1474. E-ISSN 2227-9717
R&D Projects: GA ČR(CZ) GA18-12386S
Institutional support: RVO:61389021
Keywords : black body radiation * optical emission spectroscopy * shockwave * underwater spark * water
OECD category: Chemical process engineering
Impact factor: 3.5, year: 2022
Method of publishing: Limited access
https://www.mdpi.com/2227-9717/10/8/1474

This paper is aimed at the investigation of the acoustic and spectral characteristics of underwater electric sparks generated between two plate electrodes, using synchronized gas bubble injection. There are two purposes served by discharge initiation in the bubble. Firstly, it creates a favorable condition for electrical breakdown. Secondly, the gas bubble provides an opportunity for the direct spectroscopy of plasma light emission, avoiding water absorption. The effect of water absorption on captured spectra was studied. It was observed that the emission intensity of the Ha line and a shockwave amplitude generated by discharge strongly depend on the size of the gas bubble in the moment of the discharge initiation. It was found that the plasma in the underwater spark channel does not correspond to a source of black-body radiation. This study can be also very useful for understanding the difference between discharges produced directly in a liquid and discharges produced in gas/vapor bubbles surrounded by a liquid.
Permanent Link: https://hdl.handle.net/11104/0337348