Characteristics of meter-scale surface electrical discharge propagating along water surface at atmospheric pressure

A pin liquid anode DC discharge is generated in open air without any additional gas feeding to form self-organized patterns (SOPs) on various liquid interfaces. Axially resolved emission spectra of the whole discharge reveal that the selforganized patterns are formed below a dark region and are visible mainly due to the N2 (C 3 -B 3 ) transitions. The high energy N2 (C) level is mainly excited by the impact of electrons heated by the local increased electric field at the interface. For the first time, the effect of the liquid type on the SOP formation is presented. With almost the same other discharge conditions, the formed SOPs are significantly different from HCl and H2SO4 liquid anodes. The SOP difference is repeated when the discharge current and gap distance change for both liquid anodes. The variations of SOP size and discretization as a function of discharge current and gap distance are discussed and confirm that different SOPs are formed by the HCl liquid anode from tap water or the H2SO4 liquid anode. A possible explanation is brought up to explain the dependence of SOPs on the liquid type. Effect of liquid types on formation, S. Zhang, T. Dufour, Physics of Plasmas 25, 073502 (2018) Self-organized patterns by a DC pin liquid anode discharge in ambient air: Effect of liquid types on formation, S. Zhang, T. Dufour, Physics of Plasmas 25, 073502 (2018) Self-organized patterns by a DC pin liquid anode discharge in ambient air:

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“…and 50, a plasma jet colliding with the water surface, 51 surface discharge over water in Ref 52,. water falling film DBD in Ref 53,.…”

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confidence: 99%

Self-organized patterns by a DC pin liquid anode discharge in ambient air: Effect of liquid types on formation

Zhang

Dufour

2018

Physics of Plasmas

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“…The needle electrode is placed between the two glasses, and the specially controlled surface discharge channel propagates along the water surface between the two glasses; 32 cm long streamers propagating from the needle electrode are observed. The propagation of surface discharges is observed using a highspeed camera with an interframe delay and exposure time of 10 ns [43] (Fig. 14).…”

Section: Measurement Of Radicals Among the Various Rad-mentioning

confidence: 99%

“…The average propagation speed is approximately 41 cm/μs. Figure 15 shows the emission spectra of water surface discharges measured in different gases [43]. The spectra are captured at a 13.5-cm distance from the needle electrode.…”

Section: Measurement Of Radicals Among the Various Rad-mentioning

confidence: 99%

“…Wide surface discharge plasmas on the water surface have been produced by applying pulsed power between the needle electrode placed near the water surface and the ground electrode in water [43][44][45][46]. Transient plasma streamers propagating on the water surface are produced immediately after a spark occuring between the needle electrode and the water surface.…”

Section: Introductionmentioning

confidence: 99%

“…PULSED DISCHARGE PLASMAS IN CONTACT WITH WATER AND THEIR APPLICATIONS Propagation of surface discharges on water[43] …”

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confidence: 99%

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Pulsed Discharge Plasmas in Contact with Water and their Applications

Akiyama¹,

Akiyama

2020

IEEJ Transactions Elec Engng

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Large-volume pulsed discharge plasmas have been studied to gain insight on their phenomena and to realize their applications in various areas, such as sterilization, water treatment, and cancer treatment. Since 2000, when a review paper titled 'Streamer Discharges in Liquids and their Application' was published, a number of related papers have been reported in the literature; these reports are summarized in this review paper. Four types of pulsed power-generated large-volume discharges in contact with water are presented as representative examples. The discharges are reviewed from the perspectives of the physical and chemical phenomena, as follows: the initiation of filamentary and bush-like streamers in water; the propagation and extinction of streamer discharge plasmas; the production, behavior, and collapse of bubbles; the measurement of temperature, density, electric field, shock wave, and radicals; the wide discharge on the water surface. Finally, the applications of these large-volume discharge plasmas are described.

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