About the possible source of seed electrons initiating the very first breakdown in a DBD operating with the air at atmospheric pressure

Akishev, Yu. S.; Karalnik, Vladimir; Medvedev, Mikhail; Petryakov, A. V.; Shao, Tao; Zhang, Cheng; Huang, Bangdou

doi:10.1088/1361-6595/abdaa0

Cited by 7 publications

(5 citation statements)

References 86 publications

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“…to predefine a situation in which there are no free electrons at all near the pin tip) or introduce some new physics (i.e. by considering the flux emission from cathodes due to secondary electron emission and instant detachment from the desorbed negative ions [92]).…”

Section: The Inception Of the Streamermentioning

confidence: 99%

Simulation of ionization-wave discharges: a direct comparison between the fluid model and E-FISH measurements

Zhu¹,

Chen²,

Wu³

et al. 2021

Plasma Sources Sci. Technol.

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For a long period, there was a resolution gap between numerical modeling and experimental measurements, making it hard to conduct a direct comparison between them, but they are now developing in parallel. In this work, we numerically study diffusive ionization wave and fast ionization wave discharge experiments using recently published electric-field-induced second-harmonic (E-FISH) data together with a classical fluid model. We propose a pressure-E/N range for the drift diffusion approximation and a pressure-grid range for the local field/mean energy approximation of the fluid model. The three-term Helmholtz photoionization model is generalized using parameters given for N 2 , O 2 , CO 2 , and air. The capabilities of the classical fluid method for modeling the inception, propagation, and channel breakdown stages are studied. The calculated electric field evolution of the ionization is compared with E-FISH measurements in the discharge development and gap-closing stages. The influence of electrode shape and predefined electron density on the streamer morphology and the long-standing inception problem of the ionization waves are discussed in detail. Within the application range of the classical fluid model, good agreement can be achieved between calculation and measurement.

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Section: The Inception Of the Streamermentioning

confidence: 99%

Simulation of ionization-wave discharges: a direct comparison between the fluid model and E-FISH measurements

Zhu¹,

Chen²,

Wu³

et al. 2021

Plasma Sources Sci. Technol.

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“…It can be found that at the beginning of the next discharge, W h is around 1.4 mm and n max is about 1 × 10 14 m −3 , which is 10 4 −10 5 times the background ionization. Many studies have suggested that the negative ions (mainly O − 2 in air) can provide seed electrons for subsequent discharges through electron detachment [51,52]:…”

Section: Decay Of Space Charges During the Discharge-off Phasementioning

confidence: 99%

Effect of rotating a dielectric barrier on discharge energy and uniformity in an atmospheric pressure air DBD

Yu,

Peng,

Jiang

et al. 2023

J. Phys. D: Appl. Phys.

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The application performance of the dielectric barrier discharge (DBD) depends on plasma characteristics, especially discharge energy and uniformity. In this study, the plasma characteristics are investigated in a DBD device with a rotating dielectric barrier. The statistical results indicate that rotating a dielectric barrier can effectively improve discharge power and the number of current pulses. Compared to a stationary DBD, the grayscale standard deviation of the discharge images can be significantly reduced, and the microdischarges present a rather diffuse distribution in the rotational DBD. This rotation also leads to an increase in the number of microdischarges and their movement in the direction of rotation. Additionally, a CFD numerical simulation together with the solution of the diffusion and recombination equations for space charges is implemented to study the diffusion, recombination, and transfer with airflow of space residual charges. The results reveal that the space charges move farther than their diffusion limit in most regions when the rotating speed reaches 30 rps (revolution per second). The mechanism of enhancing the discharge energy and uniformity by rotating a dielectric barrier is analyzed based on the local electric field enhancement induced by surface charges and electron detachment from space negative charges.

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“…In the volume discharge case, any physical path between the two conductive electrodes necessarily includes both the dielectric barrier and the gas medium. The associated discharge regimes and ionization waves have been investigated extensively for systems like plasma jets [6][7][8][9][10][11], packed beds [12][13][14], etc [15,16]. In the surface discharge case, there is at least one path along which the two electrodes may be reached through the dielectric barrier only.…”

Section: Introductionmentioning

confidence: 99%

Ionization wave propagation and cathode sheath formation due to surface dielectric-barrier discharge sustained in pulsed mode

Giotis

Svarnas

Amanatides

et al. 2023

Plasma Sci. Technol.

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This work deals with the experimental study of a surface dielectric-barrier discharge (DBD), as a part of the ongoing interest in the control of plasma induced electro-fluid dynamic effects (e.g., plasma actuators). The discharge is generated using a plasma reactor consisting of a fused silica plate which is sandwiched between two printed circuit boards where the electrodes are developed. The reactor is driven by narrow high voltage square pulses of asymmetric rising (25 ns) and falling (2.5 μs) parts, while the discharge evolution is con-sidered in a temporarily and spatially resolved manner over these pulses. That is, conventional electrical and optical emission analyses are combined with high resolution optical emission spectroscopy and ns-resolved imaging, unveiling main characteristics of the discharge with a special focus on its propagation along the dielectric-barrier surface. The voltage rising part leads to cathode-directed ionization waves, which propagate with a speed up to 105 m s−1. The voltage falling part leads to cathode sheath formation on the driven electrode. Τhe polarization of the dielectric barrier appears critical for the discharge dynamics.

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About the possible source of seed electrons initiating the very first breakdown in a DBD operating with the air at atmospheric pressure

Cited by 7 publications

References 86 publications

Simulation of ionization-wave discharges: a direct comparison between the fluid model and E-FISH measurements

Simulation of ionization-wave discharges: a direct comparison between the fluid model and E-FISH measurements

Effect of rotating a dielectric barrier on discharge energy and uniformity in an atmospheric pressure air DBD

Ionization wave propagation and cathode sheath formation due to surface dielectric-barrier discharge sustained in pulsed mode

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