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Electrical characteristics of a discharge in saltwater

  • Original Paper - Fluids, Plasma and Phenomenology
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Abstract

Experiments are conducted to reveal the electrical characteristics of a pulsed discharge in saltwater. To check the influence of the electrode material on discharge, we used stainless steel, red copper, and W–Cu alloy (the content of tungsten is 80%) in our experiment. As a result, four different types of discharges are observed: a typical spark discharge, a typical corona discharge, a corona discharge with a bulge, and a mixed spark discharge. In the spark discharge mode, a RLC oscillating circuit is used to describe the current after the breakdown of the electrode gap. Previous studies were mainly done using freshwater; thus, the current in the pre-breakdown period was approximately 0. However, saltwater is full of ions and is highly conductive, which brings about the appearance of a conductive current in the pre-breakdown stage. When the conductive current is considered, we obtain the analytical expression for the current in saltwater by solving the second-order ordinary coefficient differential equation with current as a variable. In combination with the short-circuit method, the constant resistance of the plasma channel is finally calculated. Actually, the channel resistance is not always the same after the breakdown. Based on the actual resistance in the first half-cycle after the breakdown, we propose a time-varying channel resistance model. By data fitting, we determined the coefficients in the time-varying channel resistance model; we also discuss the relationship between the coefficients. The results show that the fitting curve is in good agreement with the measured one.

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Acknowledgements

When my daughter was one year and two months old, I left home to pursue a doctorate. From then on, I have seldomly been able to go home for various reasons, which has led to my inability to take care of my wife and daughter. I owe a debt of gratitude to my beloved wife Yan Wang and my lovely daughter Zitong Han. It is your love and support that cheers me up and keeps me going.

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Authors and Affiliations

  1. College of Weapons, Naval University of Engineering, Wuhan, 430033, China

    Zhen Han, Xiaobing Zhang & Bing Yan

  2. Department of Weapons, Naval Petty Officer Academy, Bengbu, 233012, China

    Zhen Han & Zhigang Wang

  3. School of Electrical and Electronic Engineering, Baoji University of Arts and Sciences, Baoji, 721016, China

    Liang Qiao

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  1. Zhen Han
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  2. Xiaobing Zhang
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Correspondence to Zhen Han.

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Han, Z., Zhang, X., Yan, B. et al. Electrical characteristics of a discharge in saltwater. J. Korean Phys. Soc. 80, 299–306 (2022). https://doi.org/10.1007/s40042-021-00366-x

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  • DOI: https://doi.org/10.1007/s40042-021-00366-x

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