Effects of relative permittivity on primary and secondary streamers in atmospheric pressure dielectric barrier discharge

Yoshida, Kazuhide; Komuro, Atsushi; Andõ, Akira

doi:10.1088/1361-6463/ac0010

Cited by 4 publications

(4 citation statements)

References 47 publications

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“…Therefore, we assume that the equations proposed by Liu and Neiger [44] can be applied to our filamentary discharges. Based on the equivalent circuit, the voltage applied to a single BGO crystal, V BGO (t), can be expressed by (2) with according to the BGO capacitance of BGO, C BGO , BGO electrical charge, Q(t) on BGO, and the total external current 7) and the right column (ii) represents ϕ = 24/32T (timing (m) in figure 7). through the DBD cell, I(t), as follows:…”

Section: Equivalent Circuitmentioning

confidence: 99%

“…A dielectric barrier discharge (DBD) generates nonequilibrium plasma at atmospheric pressure. The DBD is scalable and can be easily deployed in industrial applications, such as ozone generation, airflow control, and surface modification [1][2][3][4][5][6]. DBDs are generated when a sinusoidal or pulse voltage is applied to electrodes enclosing at least one dielectric.…”

Section: Introductionmentioning

confidence: 99%

“…When a parallel-plate DBD is driven by a sinusoidal voltage under atmospheric-pressure air, numerous filamentary discharges, called microdischarges (MDs), are typically observed [7][8][9][10], although homogeneous discharge is also possible in air as reported in [11][12][13][14]. It is known that (1) the current pulse width of the MDs is very short (typically in the order of nanoseconds); (2) numerous MDs occur spatiotemporally and randomly per half-cycle; and (3) once an MD occurs, it does not occur at the same position during a half-cycle [10,[15][16][17]. The surface charge deposited on the dielectric after discharge plays a major role in the behaviour of MDs.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of surface charge density and net electric field during parallel-plate dielectric barrier discharge generated in atmospheric-pressure air

Natsume¹,

Komuro²,

Andõ³

2022

Plasma Sources Sci. Technol.

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We measured the surface charge density in a parallel-plate dielectric barrier discharge (DBD) using the Pockels effect, and the axial and lateral components of the net electric field were evaluated for different gap lengths and applied voltages. The DBD was driven by a 5 kHz sinusoidal voltage in gap lengths of 0.5, 0.3, and 0.1 mm at atmospheric pressure with Bi4Ge3O12 crystal as a dielectric. Typical microdischarges (MDs) were observed for every gap length, and the number of MDs increased with the increasing applied voltage. As the gap length decreased, the spot radius of a single MD decreased, whereas the peaks of charge density were almost the same, indicating that the amount of charge transported per unit MD is limited for short gaps. The spatial memory effect, in which MDs occur at the same position in successive cycles, was not always observed under the experimental conditions, and it was evaluated considering the surface charge density distributions. Whether the memory effect works is determined by the surface charge density, and it is likely to occur under a balance between positive and negative charges across successive half-cycles. The net electric field was estimated from surface charge measurements. The axial component of the net electric field strength increased up to 150–170 Td before the MD occurred, and it decreased below 100 Td by the surface charge deposited by MD, being approximately 50–60% of the external field amplitude. The maximum value of the lateral component of the electric field was approximately 150 Td at the edge of the MD spot with a gap length of 0.5 mm, and it decreased as the gap length decreased. As a negative surface charge generated a weaker lateral field than a positive one, the electric field distribution differed between anodic and cathodic dielectrics.

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Section: Equivalent Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterisation of surface charge density and net electric field during parallel-plate dielectric barrier discharge generated in atmospheric-pressure air

Natsume¹,

Komuro²,

Andõ³

2022

Plasma Sources Sci. Technol.

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“…They reported discharge dynamics similar to our finding with E ∼ 300 kV•cm −1 in the sheath behind the streamer head and n e ∼ 1.7 × 10 21 m −3 . Yoshiad et al [30] simulated the discharge in air between an anode pin and a dielectric (ε r = 10) surface located at 0.1 mm, and they found a maximum E-field in the sheath of ∼844 kV•cm −1 .…”

Section: Numerical Resultsmentioning

confidence: 99%

Experimental and 2D fluid simulation of a streamer discharge in air over a water surface

Herrmann,

Margot,

Hamdan

2024

Plasma Sources Sci. Technol.

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The high reactivity and attractive properties of streamer discharges make them useful in many applications based on plasma-surface interactions. Therefore, understanding the mechanisms governing the propagation of a streamer discharge as well as its properties is an essential task. This paper presents the development and application of a 2D fluid model to the simulation of discharges triggered at the air-water interface by a pulsed nanosecond high voltage. Experimental characterization using 1-ns-time-resolved imaging reveals rapid transitions from a homogeneous disc to a ring and finally to dots during the discharge process. The simulation enables the determination of the spatio-temporal dynamics of the E-field and electron density, highlighting that the discharge reaches the liquid surface in less than 1 ns, triggering a radial surface discharge. As the discharge propagates along/over the water surface, a sheath forms behind its head. Furthermore, the simulation elucidates the transitions from disc to ring and from ring to dots. The former transition arises from the ionization front's propagation speed, where an initial disc-like feature changes to a ring due to the decreasing E-field strength. The ring-to-dots transition results from the destabilization caused by radial electron avalanches as the discharge head reaches a radius of ~1. 5 mm. The simulation is further utilized to estimate a charge number and a charge content in the discharge head. This work contributes to a better understanding of discharge propagation in air near a dielectric surface, with the agreement between simulation and experiment validating the model in its present version.

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Influence of rotating dielectric barrier on discharge characteristics in multi‐needle‐plate DBD

Yu,

Peng,

Jiang

et al. 2023

Plasma Processes & Polymers

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Enhancing discharge energy in dielectric barrier discharge (DBD) is vital for various applications. This study establishes a theoretical formula for predicting enhanced discharge in multi‐needle‐plate (MP) DBD, accounting for factors like needle count, rotation speed, and voltage frequency. Experiments validate the formula's accuracy, showing that precisely matched parameters result in enhanced discharge power, heightened streamer luminosity, and curved streamer channels. Lissajous figures in MP DBD exhibit elliptical shapes due to residual discharges during voltage fall. Statistical analysis of current pulses and discharge images confirms that dielectric plate rotation increases discharges and extends their duration during voltage fall. Numerical simulations highlight surface charge movement's role in enhancing the electric field and affecting streamer propagation direction in the air gap.

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Effects of relative permittivity on primary and secondary streamers in atmospheric pressure dielectric barrier discharge

Cited by 4 publications

References 47 publications

Characterisation of surface charge density and net electric field during parallel-plate dielectric barrier discharge generated in atmospheric-pressure air

Characterisation of surface charge density and net electric field during parallel-plate dielectric barrier discharge generated in atmospheric-pressure air

Experimental and 2D fluid simulation of a streamer discharge in air over a water surface

Influence of rotating dielectric barrier on discharge characteristics in multi‐needle‐plate DBD

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