Atmospheric pressure self-organized filaments in dielectric barrier discharge excited by a modulated sinusoidal voltage

Wu, Kaiyue; Wu, Jiacun; Jia, Bin; Ren, Chenhua; Kang, Pengcheng; Jia, Pengying; Li, Xuechen

doi:10.1063/5.0002697

Cited by 15 publications

(12 citation statements)

References 37 publications

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“…Among all discharge characteristics of DBD, spatial discharge behavior is one of the most important aspects [13][14][15][16]. amplitude [17] and driving frequency [18], DBD can exhibit different spatial discharge modes, including the uniform mode and the columnar (filamentary) mode.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric dielectric barrier discharge containing helium–air mixtures: the effect of dry air impurities on the spatial discharge behavior

Wang¹,

Dai²,

Ning³

et al. 2021

J. Phys. D: Appl. Phys.

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Air is a typical and arguably unavoidable impurity in atmospheric pressure dielectric barrier discharges (DBDs). The introduction of air may bring rich plasma chemical effects on DBDs and lead to a significant change of discharge characteristics. Here we implement a two-dimensional fluid model to study the spatial discharge behavior in a helium–dry-air DBD under the air impurity level (N air) of 10–200 ppm. The simulation results reveal that under low impurity content (less than 30 ppm), the gas gap cannot be ignited due to the feeble Penning ionization during the breakdown. However, with an elevation in the impurity level, the progressively enhanced Penning ionization makes the DBD experience three different spatial modes, namely uniform, columnar, and complementary quasi-uniform modes. Of particular note is that the improvement of discharge uniformity observed after the second mode transition is not directly controlled by seed electron level—a previously reported qualitative indicator of the discharge uniformity concluded by helium DBDs with only nitrogen traces. And the main contributor to this phenomenon is the complementary spatial structure appearing in successive two discharges induced by the further reinforced Penning ionization with extra oxygen doped. The result suggests the necessity of considering oxygen in helium–air DBDs when the impurity effect of air is concerned.

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Section: Introductionmentioning

confidence: 99%

Atmospheric dielectric barrier discharge containing helium–air mixtures: the effect of dry air impurities on the spatial discharge behavior

Wang¹,

Dai²,

Ning³

et al. 2021

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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“…As mentioned above, field strength in each mode increases with decreasing d . A stronger field means that electrons can obtain more energy, resulting in a higher T exc [47, 51]. Additionally, the first ionisation coefficient ( α ) is larger with a stronger field, which contributes to a higher n e [51, 52].…”

Section: Resultsmentioning

confidence: 99%

“…A stronger field means that electrons can obtain more energy, resulting in a higher T exc [47, 51]. Additionally, the first ionisation coefficient ( α ) is larger with a stronger field, which contributes to a higher n e [51, 52]. As a result, T exc and n e in each mode increase with decreasing d (Figure 7).…”

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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Atmospheric pressure self-organized filaments in dielectric barrier discharge excited by a modulated sinusoidal voltage

Cited by 15 publications

References 37 publications

Atmospheric dielectric barrier discharge containing helium–air mixtures: the effect of dry air impurities on the spatial discharge behavior

Atmospheric dielectric barrier discharge containing helium–air mixtures: the effect of dry air impurities on the spatial discharge behavior

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

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

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