Electrical characteristics of monofilaments in dielectric barrier discharge plasma jets at atmospheric pressure

Liu, Feng; Wang, Weiwei; Chang, Xijiang; Wu, Zhonghang; He, Long; Li, Zebin; He, Zhijiang; Liang, Rongqing

doi:10.1209/0295-5075/97/65001

Cited by 11 publications

(11 citation statements)

References 12 publications

(14 reference statements)

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“…In our experimental conditions, the voltage is not constant during the very short lifetime of the micro-discharge: it decreases from the breakdown potential to a lower value, thus explaining why V is negative and therefore why the segment presents a negative slope. This type of phenomenon has also been observed in various atmospheric pressure plasma jets (APPJ) and DBD [46] [47].…”

Section: T1 = 1s T2 = 2s T3 = 3smentioning

confidence: 60%

Seed-packed dielectric barrier device for plasma agriculture: Understanding its electrical properties through an equivalent electrical model

Judée

Dufour

2020

Journal of Applied Physics

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Seeds have been packed in a dielectric barrier device where cold atmospheric plasma has been generated to improve their germinative properties. A special attention has been paid on understanding the resulting plasma electrical properties through an equivalent electrical model whose experimental validity has been demonstrated here. In this model, the interelectrode gap is subdivided into 4 types of elementary domains, according to whether they contain electric charges (or not) and according to their type of medium (gas, seed or insulator). The model enables to study the influence of seeds on the plasma electrical properties by measuring and deducing several parameters (charge per filament, gas capacitance, plasma power, …) either in no-bed configuration (i.e. no seed in the reactor) or in packed-bed configuration (seeds in the reactor). In that second case, we have investigated how seeds can influence the plasma electrical parameters considering six specimens of seeds (beans, radishes, corianders, lentils, sunflowers and corns). The influence of molecular oxygen (0-100 sccm) mixed with a continuous flow rate of helium (2 slm) is also investigated, especially through filaments breakdown voltages, charge per filament and plasma power. It is demonstrated that such bed-packing drives to an increase in the gas capacitance (ξOFF), to a decrease in the βparameter and to variations of the filaments' breakdown voltages in a seed-dependent manner. Finally, we show how the equivalent electrical model can be used to assess the total volume of the contact points, the capacitance of the seeds in the packed-bed configuration and we demonstrate that germinative effects can be induced by plasma on four of the six agronomical specimens.

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Section: T1 = 1s T2 = 2s T3 = 3smentioning

confidence: 60%

Seed-packed dielectric barrier device for plasma agriculture: Understanding its electrical properties through an equivalent electrical model

Judée

Dufour

2020

Journal of Applied Physics

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“…For efficient ozone production, it is required to minimize the ratio of kδ/k1 + k2 (α). Many reports stated that the lowest α is acquired with the 100-200 Td (Td: Electric field over Particle number density) of reduced electric field, in which Sabadil et al (1980) calculated 4 of theoretical minimum α at 110 Td (Bogaerts et al 2002;Descamps et al 2013;Liu et al 2012). This indicates that a single atom oxygen essential for ozone generation is generated in the filament channel.…”

Section: Optimum Discharge Pressurementioning

confidence: 99%

“…By decreasing the gap distance at a constant gas flow rate makes the flow velocity faster in the discharge area. Blurred filament channels by gas flow, so called afterglow plasma, has influence on the filament size and the arrangement in the discharge area so that the filament volume and spacing increases (Descamps et al 2013;Liu et al 2012). According to the results, the fact that the optimum pressure increases by decreasing the gap distance can be explained by the blurred filament, which becomes more effective as the gas flow velocity increases.…”

Section: Optimum Discharge Pressurementioning

confidence: 99%

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Optimizing Factors on High Concentration of Ozone Production with Dielectric Barrier Discharge

Seok

Jeong

Jung

et al. 2014

Ozone: Science & Engineering

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The gap distance, electrode material, voltage and gas flow velocity were optimized with gas pressure variation of dielectric barrier discharge (DBD) for producing high concentration of ozone. There exists an optimum gas pressure at which the highest ozone concentration is produced with other parameters being fixed. This optimum gas pressure value changes accordingly as the other parameters changed. As the discharge continues at the optimum pressure, the ozone concentration could increase or decrease slowly. This aging effect has different characteristics with the metal electrode material and the impurity level of the oxygen gas used for ozone generation. The aging effect is supposed to be related with the catalytic effect of metal oxide, which is generated in the discharge zone. The change in the characteristic of optimum pressure by the other parameters, indicate that the ozone concentration is deeply related with the filament self-organization characteristics of DBD. At the final optimized condition, the ozone concentration was higher than 22.5 wt.%.

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“…Due to the random spatial location of filaments for long exposition time, the plasma looks homogeneous. It has been noted that the gas flow plays a significant role on the filament propagation, as, for example, was also reported in [23]. In the mentioned reference authors demonstrated that the gas flow influence not only visual appearance of the plasma but also its electrical properties.…”

Section: Methodsmentioning

confidence: 63%

Influence of Nozzle Shape on the Performance of Low-Power Ar Plasma Jet

Castro

Kostov

Prysiazhnyi

2015

IEEE Trans. Plasma Sci.

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The influence of nozzle geometry on the properties of atmospheric-pressure Ar plasma jet was investigated. Three different nozzle types were tested: 1) a tapered nozzle (to get a thin plasma plume); 2) a straight nozzle (used in most cases); and 3) an enlarged nozzle (to increase the active plasma area). The electrical properties and visual appearance of the generated plasma were studied with these three nozzles. The jet's performance for surface modification was evaluated by measuring the area of the samples with enhanced wettability and comparing it with the image analysis of the light emission over the sample surface. It has been concluded that limiting the nozzle diameter can be a solution to reduce the treatment area. However, the decrease in the treated area is limited due to the plasma spreading. The use of widen nozzle leads to increase in the treated area and possibility to control the mixture of the carrier gas with ambient air, making this nozzle configuration potentially interesting for other applications, as, for example, treatment of small 3-D objects.Index Terms-Jet geometry, plasma jet, power measurements.

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Electrical characteristics of monofilaments in dielectric barrier discharge plasma jets at atmospheric pressure

Cited by 11 publications

References 12 publications

Seed-packed dielectric barrier device for plasma agriculture: Understanding its electrical properties through an equivalent electrical model

Seed-packed dielectric barrier device for plasma agriculture: Understanding its electrical properties through an equivalent electrical model

Optimizing Factors on High Concentration of Ozone Production with Dielectric Barrier Discharge

Influence of Nozzle Shape on the Performance of Low-Power Ar Plasma Jet

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