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

Wu, Kaiyue; Liu, Jingnan; Wu, Jiacun; Chen, Mo; Ran, Junxia; Pang, Xiaoyan; Jia, Pengying; Li, Xuechen; Ren, Chenhua

doi:10.1049/hve2.12327

Cited by 13 publications

(7 citation statements)

References 88 publications

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“…The reasons for this phenomenon were analyzed as follows. The excited species of O (3p), OH (A), and H (n = 3) were generated mainly by the collisions between molecules and energetic electrons whose energy obtained in the acceleration process was positively correlated with the electric field strength [47]. As a pulsed discharge current ran through the entire applied pulse voltage period, it could be assumed that the variation of the electric field strength over time during one discharge cycle also followed a pulse evolution characteristic shown in figure 4.…”

Section: Temporal Evolution Of Excited Speciesmentioning

confidence: 99%

Temporal evolution characteristics of the excited species in a pulsed needle-water discharge: effect of voltage and frequency

Zhou

Xiang

Yang

et al. 2023

J. Phys. D: Appl. Phys.

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Transient spark discharge has a broad application prospect due to its excellent performance in generating reactive oxygen species, but there is currently limited research on the transient excited species which are the important precursors for the formation of these species. This paper obtained a transient spark discharge with a needle-water electrode configuration, and then developed an optical detection system based on photomultiplier to measure the temporal evolution of four excited species. It is observed that N2 (C) is produced mainly in the streamer phase while H (n=3), O (3p), and OH (A) are produced mainly in the spark phase, which is resulted from the difference in threshold energy and pathway for generating different species. To investigate the variation mechanism of peak time and peak intensity during the evolution process, the gas temperature T g, electron density n e, and electron excitation temperature T exc were calculated by using the optical emission spectroscopy under different pulse voltage and pulse repetition frequency conditions. The results indicate that the discharge conditions influence the physical parameters of T g, n e, and T exc as well as the output voltage waveform, and then they jointly determine the evolution characteristics of excited species. These insights contribute to understand the characteristics of excited species which affect the formation of reactive species by influencing the chemical chain reaction in the transient spark discharge.

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Section: Temporal Evolution Of Excited Speciesmentioning

confidence: 99%

Temporal evolution characteristics of the excited species in a pulsed needle-water discharge: effect of voltage and frequency

Zhou

Xiang

Yang

et al. 2023

J. Phys. D: Appl. Phys.

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“…As a result, the intensity ratio of 738 nm to 750 nm is used as an indicator of n e . [42,43] By this method, T e and n e are investigated as functions of d, as shown in Fig. 7.…”

Section: Resultsmentioning

confidence: 99%

Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

Xu 许,

Gao 高,

Jia 贾

et al. 2024

Chinese Phys. B

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Plasma jet has extensive application potentials in various fields, which normally operates in a diffuse mode when helium is used as the working gas. However, when less expensive argon is used, the plasma jet often operates in a filamentary mode. Compared to the filamentary mode, the diffuse mode is more desirable for applications. Hence, many efforts have been exerted to accomplish the diffuse mode of the argon plasma jet. In this paper, a novel single-needle argon plasma jet is developed to obtain the diffuse mode. It is found that the plasma jet operates in the filamentary mode when the distance from the needle tip to the central line of the argon stream (d) is short. It transits to the diffuse mode with increasing d. For the diffuse mode, there is always one discharge pulse per voltage cycle, which initiates at the rising edge of the positive voltage. For comparison, the number of discharge pulse increases with an increase in the peak voltage for the filamentary mode. Fast photography reveals that the plasma plume in the filamentary mode results from a guided positive streamer, which propagates in the argon stream. However, the plume in the diffuse mode originates from a branched streamer, which propagates in the interfacial layer between the argon stream and the surrounding air. By optical emission spectroscopy, plasma parameters are investigated for the two discharge modes, which show a similar trend with increasing d. The diffuse mode has lower electron temperature, electron density, vibrational temperature, and gas temperature compared to the filamentary mode.

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“…In atmospheric pressure Ar discharges, the line-ratio technique is one of the most widely used approaches for a fast estimation of n e and T e , especially in experiments with one single variable, e.g. voltage or flow [24][25][26][27]. To gather further information on electron properties, a line-ratio method that has been proposed in [28], with a collisional-radiative (CR) model developed in [29], is adopted to determine absolute n e and T e values with the emission lines from Ar(2p) levels under different experimental conditions.…”

Section: Analysis: Electron Properties From Optical Emission Spectros...mentioning

confidence: 99%

Characteristics of the O(¹S) to O(¹D) 557.7 nm green emission observed in an argon plasma jet

Zhao,

Wang,

Zhu

et al. 2024

J. Phys. D: Appl. Phys.

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An extensive study on the green auroral emission characterization is presented based on a single DBD geometry argon plasma jet driven by a kHz sine voltage. The plasma was generated by using 99.999% pure argon and the observed 557.7 nm green line resulted from the excited O(1S) state. An optical emission spectroscopy method using line ratios of argon was used to obtain the electron density and electron temperature under different conditions in the downstream region. The characteristics of discharge and green emission with variations in interelectrode distance, applied voltage (power) and flow rate are discussed. The spatially diffuse distribution of O(1S), owing to its long lifetime, is shown by the short exposure imaging. Two discharge regimes are presented, accompanied by two distinct branches of the green emission intensity, with a clear conclusion that the 557.7 nm emission is favoured in the low electron temperature environment. In this work, the intense and diffuse green plume only forms when the downstream electron density is approximately lower than 1 × 1014 cm-3 and the electron temperature is lower than 1.1 eV. By charging the two electrodes in two opposite ways, it is shown that the green emission from oxygen is favoured in the case where the electric field and the electron drift are not continuous.

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

Cited by 13 publications

References 88 publications

Temporal evolution characteristics of the excited species in a pulsed needle-water discharge: effect of voltage and frequency

Temporal evolution characteristics of the excited species in a pulsed needle-water discharge: effect of voltage and frequency

Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

Characteristics of the O(¹S) to O(¹D) 557.7 nm green emission observed in an argon plasma jet

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

Cited by 13 publications

References 88 publications

Temporal evolution characteristics of the excited species in a pulsed needle-water discharge: effect of voltage and frequency

Temporal evolution characteristics of the excited species in a pulsed needle-water discharge: effect of voltage and frequency

Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

Characteristics of the O(1S) to O(1D) 557.7 nm green emission observed in an argon plasma jet

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Characteristics of the O(¹S) to O(¹D) 557.7 nm green emission observed in an argon plasma jet