Observation of self-organized honeycomb patterns by fast photography in a liquid-anode discharge

Gao, Kun; Wu, Kaiyue; Jia, Pengying; Jia, Bin; Kang, Pengcheng; Li, Xuechen

doi:10.1063/1.5116063

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…Excited by an alternating-current (AC) sinusoidal voltage, the doublering pattern has also been found under a low conductivity of 55 nS•cm −1 [26]. Compared to the double ring, a triple-ring pattern is only formed with a conductivity higher than several hundred μS•cm −1 , which can be excited by a direct-current (DC) voltage [27], an asymmetric sine [28], or a square wave [29]. Up to now, concentric-ring patterns more than quadruple rings have not been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Various concentric-ring patterns formed in a water-anode glow discharge operated at atmospheric pressure

Wu¹,

Zhao²,

Niu³

et al. 2022

Plasma Sci. Technol.

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Pattern formation is a very interesting phenomenon formed above a water anode in atmospheric pressure glow discharge. Up to now, concentric-ring patterns only less than four rings have been observed in experiments. In this paper, atmospheric pressure glow discharge above a water anode is conducted to produce diversified concentric-ring patterns. Results indicate that as time elapses, the number of concentric rings increases continuously and up to five rings have been found in the concentric-ring patterns. Moreover, the ring number increases continuously with increasing discharge current. The electrical conductivity of the anode plays an important role in the transition of the concentric patterns due to its positive relation with ionic strength. Hence, the electrical conductivity of the water anode is investigated as a function of time and discharge current. From optical emission spectrum, gas temperature and intensity ratio related with density and temperature of electron have been calculated. The various concentric-ring patterns mentioned above have been simulated at last with an autocatalytic reaction model.

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Section: Introductionmentioning

confidence: 99%

Various concentric-ring patterns formed in a water-anode glow discharge operated at atmospheric pressure

Wu¹,

Zhao²,

Niu³

et al. 2022

Plasma Sci. Technol.

Self Cite

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“…Besides the extensive application fields mentioned above, atmospheric pressure discharge with liquid electrode is a good candidate for fundamental studies, such as pattern formation [8]. Under proper conditions, various luminous patterns can be formed on the surface of a liquid anode, which mainly include multiple dots [8], concentric rings [9,10], stripes [10], and honeycombs [11], etc. Besides the various patterns on a liquid anode, discharge can present diverse morphologies in the gas gap above it.…”

Section: Introductionmentioning

confidence: 99%

Morphology evolution of an atmospheric pressure glow discharge initiated in the air gap between a liquid cathode and a needle anode

Jia

Gao

Zhou

et al. 2021

Plasma Sources Sci. Technol.

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Self-deformation has been observed for an atmospheric pressure diffuse discharge initiated in the air gap between a needle anode and a water cathode, which undergoes a morphology scenario from a cone, an axially symmetric horn, to a rectangular horn as time elapses. During the self-deformation process, pH value and electric conductivity of the water cathode vary with time. Moreover, electrical measurements indicate that applied voltage and discharge current are time-invariant for the conical discharge, while periodically pulsed for the other two discharges. This may suggest different formation mechanisms of them. Hence, fast photography is implemented by a high-speed video camera and an intensified charge coupled device. Results indicate that the diffuse discharges with different morphologies belong to a glow discharge regime. Among them, the conical discharge is composed of stationary micro-discharge, and the horn-shaped discharges consist of moving micro-discharge. Moreover, the axially symmetric horn is a self-rotating version of the rectangular horn. Furthermore, the rectangular horn originates from the swing of a micro-discharge filament like a pendulum motion. Finally, qualitative explanations are given for the experimental phenomena mentioned above.

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Diffuse and spotted anode layers in an atmospheric pressure glow discharge with a water electrode and miniature argon flow

Kang

Gao

et al. 2020

Plasma Processes & Polymers

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Upon varying discharge current and gap width, several self‐organized patterns are observed in the anode layer of an atmospheric pressure glow discharge with miniature axial argon flow, including diffuse‐disk, single‐ring, disk‐ring, wheel‐spokes, and radial‐stripes patterns. Among them, the wheel‐spokes pattern is observed for the first time in atmospheric pressure glow discharge above a water anode. The conditions for generating the self‐organized patterns are also investigated. Fast photography results indicate that the patterns with low current and narrow gap are diffuse in nature, while those with high current and wide gap are composed of individual spots. This is further verified from waveforms of applied voltage and light emission signals. Moreover, the generation, movement, and disappearance of discrete spots are observed by a high‐speed video camera. Besides, the optical emission spectrum indicates that the glow discharge above the water surface is abundant with electronegative species, including O, NO, NH, and OH. Finally, the formation mechanism of diffuse and spotted anode layers is revealed.

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Observation of self-organized honeycomb patterns by fast photography in a liquid-anode discharge

Cited by 4 publications

References 18 publications

Various concentric-ring patterns formed in a water-anode glow discharge operated at atmospheric pressure

Various concentric-ring patterns formed in a water-anode glow discharge operated at atmospheric pressure

Morphology evolution of an atmospheric pressure glow discharge initiated in the air gap between a liquid cathode and a needle anode

Diffuse and spotted anode layers in an atmospheric pressure glow discharge with a water electrode and miniature argon flow

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