Different ionization mechanisms in pulsed micro-DBD’s in argon at different pressures

Yaogong, Wang; Ma, Xiaoqin; Bouwman, Dennis; Liu, Zhuoran; Ebert, Ute; Zhang, Xiaoning

doi:10.1088/1361-6595/ac9751

Cited by 3 publications

(3 citation statements)

References 47 publications

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“…Numerical simulations are also conducted to understand the influence of microscopic parameters of the DBD on the discharge morphology [24][25][26]. Li et al utilized a twodimensional (2D) fluid model and discovered that the density of the positive ion cloud influenced the path and development speed of the jet streamer [27].…”

Section: Introductionmentioning

confidence: 99%

On the evolution and formation of discharge morphology in pulsed dielectric barrier discharge

CHEN 陈,

LI 李,

WANG 王

et al. 2024

Plasma Sci. Technol.

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The discharge morphology of pulsed dielectric barrier discharge (PDBD) plays important roles in its applications. Here, we systematically investigated the effects of voltage amplitude, discharge gap, and O2 content on the PDBD morphology, and revealed the possible underlying mechanism of the U-shape formation. First, the morphological evolution under different conditions were recorded. A unique U-shape region appears in the middle edge region when the gap is larger than 2 mm, while the entire discharge region remains columnar under a 2 mm gap in He PDBD. The width of the discharge and the U-shape region increase with the increase of voltage and decreases with the increase of the gap and O2 content. To explain this phenomenon, then a two-dimensional symmetric model was developed to simulate the spatiotemporal evolution of different species and calculate the electric thrust. The discharge morphology evolution directly corresponds to the excited state atomic reduction process. The electric thrust on the charged particles mainly determines the reaction region and strongly influences the U-shape formation. When the gap is less than 2 mm, the electric thrust is homogeneous throughout the entire region, resulting in a columnar shape. However, when the gap is larger than 2 mm or O2 is added, the electric thrust in the edge region becomes greater than that in the middle, leading to the U-shape formation. Furthermore, in He PDBD, the charged particles generating electric thrust are mainly electrons and helium ions, while in He/O2 PDBD those generate electric thrust at the outer edge of the electrode surface are mainly various oxygen-containing ions.

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Section: Introductionmentioning

confidence: 99%

On the evolution and formation of discharge morphology in pulsed dielectric barrier discharge

CHEN 陈,

LI 李,

WANG 王

et al. 2024

Plasma Sci. Technol.

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“…At present, explicit PIC algorithms is perhaps the most widely used method. [4][5][6][7][8] Such the method calculates the electromagnetic (EM) field based on the known information of the particles, at the currently calculation step. Explicit PIC algorithms require very small spatial step ∆x and time-step ∆t to obtain the desired numerical stability.…”

Section: Introductionmentioning

confidence: 99%

Speeding-up direct implicit particle-in-cell simulations in bounded plasma by obtaining future electric field through explicitly propulsion of particles

Tan 谭,

Huang 黄,

Ji 季

et al. 2023

Chinese Phys. B

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The direct implicit Particle-In-Cell is a powerful kinetic method for researching plasma characteristics. However, it is time-consuming to obtain the future electromagnetic field in such method since the field equations contain time-dependent matrix coefficients. In this work, we propose to explicitly push particles and obtain the future electromagnetic field based on the information about the particles in the future. The new method retains the form of implicit particle pusher, but the future field is obtained by solving the traditional explicit equation. Several numerical experiments, including the motion of charged particle in electromagnetic field, plasma sheath and free diffusion of plasma into vacuum, are implemented to evaluate the performance of the method. The results demonstrate that the proposed method can suppress Finite-Grid-Instability resulting from the coarse spatial resolution in electron Debye length through the strong damping of high-frequency plasma oscillation, while accurately describe low-frequency plasma phenomena, with the price of losing the numerical stability at large time-step. We believe that this work is helpful for people to research the bounded plasma by using Particle-In-Cell simulations.

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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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Different ionization mechanisms in pulsed micro-DBD’s in argon at different pressures

Cited by 3 publications

References 47 publications

On the evolution and formation of discharge morphology in pulsed dielectric barrier discharge

On the evolution and formation of discharge morphology in pulsed dielectric barrier discharge

Speeding-up direct implicit particle-in-cell simulations in bounded plasma by obtaining future electric field through explicitly propulsion of particles

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

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