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Analysis of the Preheating Phase of Micro-Arc Discharge in Seawater, Operated Using a Needle-to-Plane Electrode with Variation in the Tip Shape

1
Department of Electronic and Photonic Systems Engineering, Kochi University of Technology, Kami, Kochi 782-8502, Japan
2
Department of Electrical and Electronic Engineering, Meijo University, Nagoya, Aichi 468-8502, Japan
3
Center for Nanotechnology, Research Institute of KUT, Kochi University of Technology, Kami, Kochi 782-8502, Japan
*
Author to whom correspondence should be addressed.
Plasma 2019, 2(3), 303-315; https://doi.org/10.3390/plasma2030022
Received: 30 May 2019 / Revised: 27 June 2019 / Accepted: 5 July 2019 / Published: 8 July 2019
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Abstract

In this work, micro-arc discharge is investigated using a needle-to-plane electrode system placed with a micro-gap in highly conductive artificial seawater. A major problem with microarc discharge is the erosion of electrodes caused by the high current of the arc; however, it was found that erosion of the needle electrode did not have any effect on the discharge process in the case of precise control of the discharge gap. A simple mathematical model was developed for a more detailed study of the preheating phase of the discharge. The modeling showed good agreement with the experimental results and confirmed that the needle electrode could be reused to generate reproducible micro-arc discharges even after the erosion caused by the arc. Moreover, it was found that, in certain conditions, the preheating phase could be simulated using a simple inductor-capacitor-resistor (LCR) oscillator model with a resistor instead of electrodes immersed in the liquid. It was confirmed that the shape of the needle electrode’s tip did not affect the measurement of optical emission spectra in the case of precise focusing, which could be used in the development of compact analytical tools for on-site analysis of deep-sea water using atomic emission spectroscopy. View Full-Text
Keywords: micro-arc; seawater; OES; erosion micro-arc; seawater; OES; erosion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gamaleev, V.; Hiramatsu, M.; Ito, M.; Furuta, H.; Hatta, A. Analysis of the Preheating Phase of Micro-Arc Discharge in Seawater, Operated Using a Needle-to-Plane Electrode with Variation in the Tip Shape. Plasma 2019, 2, 303-315.

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