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

Jia, Pengying; Gao, Kun; Zhou, Shuai; Chen, Junyu; Wu, Jiacun; Wu, Kaiyue; Li, Xuechen

doi:10.1088/1361-6595/abde51

Cited by 13 publications

(12 citation statements)

References 40 publications

(40 reference statements)

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“…Moreover, as a function of E , the first Townsend ionization coefficient ( α ) dominates the secondary electron avalanches (electron production process). [ 39,78 ] Therefore, n e has a similar trend with E , reaching a minimum once in front of a peak in the snake‐like plume. Consequently, both T e and n e reach their minima once in front of a peak (Figure 9a,b).…”

Section: Resultsmentioning

confidence: 90%

“…For the snake-like plume, the length dependence can be explained by the same reason reported by Xian et al [75] Let us consider the dark plasma channel behind the streamer head, in which negative oxygen ions are formed due to electron attachment. [76][77][78] With increasing Q, fewer electrons are attached due to C O decrease, resulting in a higher conductivity of the plasma channel and a lower potential drop along the channel. Therefore, the potential drop of the streamer head increases, which will direct the streamer to propagate a longer distance.…”

Section: Methodsmentioning

confidence: 99%

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Discharge aspects of a snake‐like plasma plume generated by an atmospheric pressure plasma jet with variable argon flow rate

Ran

et al. 2023

Plasma Processes & Polymers

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Plasma plume morphology, related to streamer behavior and active‐species distribution of plasma jets, is important for fixed‐point and precise treatment of workpieces. For a peculiar snake‐like plume, discharge aspects are investigated with varying argon flow rate (Q) in this paper. Results indicate that the plume length and distance between two neighboring peaks of the snake‐like plume increase with increasing Q. Fast photography indicates that the snake‐like plume is composed of positive streamers propagating along a reproducible serpentine trajectory, which occurs once per voltage cycle. Based on optical emission spectroscopy, electron temperature, electron density, and vibrational temperature are investigated with varying Q. All these phenomena are qualitatively analyzed finally.

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Section: Resultsmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Discharge aspects of a snake‐like plasma plume generated by an atmospheric pressure plasma jet with variable argon flow rate

Ran

et al. 2023

Plasma Processes & Polymers

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“…Figure 6a indicates 300–900 nm scanned optical emission spectra from the planar plume. For both modes, typical spectral lines include the band of OH (A 2 Σ + →X 2 Π), the second positive system of N 2 (C 3 Π u →B 3 Π g ), and Ar I (4p→4s) [45]. In the filamentary mode, O I (3p 5 P→3s 5 S) [46] can also be observed.…”

Section: Resultsmentioning

confidence: 99%

A double‐mode planar argon plume produced by varying the distance from an atmospheric pressure plasma jet

Liu

et al. 2023

High Voltage

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Atmospheric pressure planar plumes are desirable for the applications of low temperature plasmas, such as rapid modification of large‐scale surfaces. Up to now, only single‐mode planar plumes with either a streamer mode or a filamentary mode have been reported in the literature. Distinctive from the single‐mode planar plumes, a double‐mode argon planar plume has been generated in this article, which operates in the streamer mode with a larger distance away from a plasma jet and transits to the filamentary mode with decreasing the distance. Discharge characteristics and plasma parameters are compared for the two modes. Results indicate that the streamer mode and the filamentary mode correspond to pulsed and humped discharges respectively. Fast photography reveals that the streamer‐mode plume is composed of stochastically branching streamers, while the filamentary‐mode plume results from a series of moving filaments similar to those in barrier discharge. In contrast to the streamer mode, the filamentary mode has lower excited electron temperature and vibrational temperature, whereas higher electron density and gas temperature. In addition, better hydrophilicity of polyethylene terephthalate surface is achieved in the filamentary mode.

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“…[29,55] Electrons are mainly produced in the plasma through the impact of argon atoms by electrons, which is dominated by the first Townsend ionization coefficient (α). [56,57] α is a function of E. [58] A higher E tends to produce a plasma with a higher electron density. Therefore, positive discharge has a higher electron density than negative discharge.…”

Section: Resultsmentioning

confidence: 99%

Influence of oxygen addition on the discharge characteristics of an argon plasma jet at atmospheric pressure

Chen¹,

Zhao²,

Wu³

et al. 2022

Chinese Phys. B

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Plasma jet is an important low-temperature plasma source in extensive application fields. To promote the production of active oxygen species, oxygen is often introduced into the inert working gas. However, the influence of oxygen content on the discharge characteristics of an argon plasma jet is not clear. Aim to this status, an argon plasma jet in a single-electrode geometry is employed to investigate the influence of oxygen concentration (Co) on discharge aspects. Results indicate that with increasing Co (≤ 0.6%), the plume transits from a diffuse morphology to a hollow structure. Electrical and optical measurements reveal that both discharge number per voltage cycle and pulse intensity alter with varying Co. Moreover, discharge morphologies of negative and positive discharges obtained by fast photograph also shift with varying Co. Besides, optical emission spectra are collected to investigate atomic oxygen concentration, electron density, and electron temperature. The results mentioned above are explained qualitatively, which are believed to be of great significance for the applications of atmospheric pressure plasma jet.

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

Cited by 13 publications

References 40 publications

Discharge aspects of a snake‐like plasma plume generated by an atmospheric pressure plasma jet with variable argon flow rate

Discharge aspects of a snake‐like plasma plume generated by an atmospheric pressure plasma jet with variable argon flow rate

A double‐mode planar argon plume produced by varying the distance from an atmospheric pressure plasma jet

Influence of oxygen addition on the discharge characteristics of an argon plasma jet at atmospheric pressure

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