The effect of applied electric field on pulsed radio frequency and pulsed direct current plasma jet array

Hu, J. T.; Liu, X.Y.; Liu, J.H.; Xiong, Zheng; Liu, D.W.; Lü, Xing; Iza, Felipe; Kong, Michael G.

doi:10.1063/1.4729730

Cited by 31 publications

(13 citation statements)

References 22 publications

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“…The ionization rate shown in Figure 2 1) and (5). The high concentration of air at the nozzle results in localized photoionization, which cannot act as a source of pre-ionization and provide enough electrons ahead of the streamer head.…”

Section: Results and Analysismentioning

confidence: 97%

The effect of working gas impurities on plasma jets

Liu

2015

Physics of Plasmas

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Air intrusion reduced the purity of working gas inside the tube for plasma jet, and thereby, affected the discharge dynamics. In this paper, the effect of using working gas with different purity level (helium purity 99.99999%, 99.99%, 99.9%, and 99%) on photoionization and the chemical reactivity of plasma jet were studied using a 2 dimensional plasma jet model. Photoionization of air species acted as a source of pre-ionization in front of the ionization region, which facilitated the transition from localized discharge to streamers inside the tube. The density of reactive species inside the tube was found to increase with the concentration of working gas impurities. For the highest purity helium (99.99999%), despite a low photoionization rate and the distance between the photoionization region and ionization region inside the tube, by increasing the applied voltage and decreasing the distance between the electrode and nozzle, plasma jets were formed V C 2015 AIP Publishing LLC. [http://dx.

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Section: Results and Analysismentioning

confidence: 97%

The effect of working gas impurities on plasma jets

Liu

2015

Physics of Plasmas

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“…[11] Recently, several groups claimed experimentally that pulse-modulation of the rf power could significantly change the gas temperature (T g ). [12][13][14] Theoretical models simulating T g for a self-consistent, non-equilibrium plasma discharge have been developed over the last 50 years. Pytte and Winsor [15] gave a simple twotemperature theoretical model for atmospheric helium arc plasma in a cylindrical duct.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the gas heating mechanism in pulse-modulated radio-frequency glow discharge

Wang¹,

Yu²,

Wang

2017

Chinese Phys. B

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The gas heating mechanism in the pulse-modulated radio-frequency (rf) discharge at atmospheric pressure was investigated with a one-dimensional two-temperature fluid model. Firstly, the spatiotemporal profiles of the gas temperature (T g ) in both consistent rf discharge and pulse-modulated rf discharge were compared. The results indicated that T g decreases considerably with the pulse-modulated power, and the elastic collision mechanism plays a more important role in the gas heating change. Secondly, the influences of the duty cycle on the discharge parameters, especially on the T g , were studied. It was found that T g decreases almost linearly with the reduction of the duty cycle, and there exists one ideal value of the duty cycle, by which both the T g can be adjusted and the glow mode can be sustained. Thirdly, the discharge mode changing from α to γ mode in the pulse-modulated rf discharge was investigated, the spatial distributions of T g in the two modes show different features and the ion Joule heating is more important during the mode transition.

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“…In recent years, efforts to improve the downstream uniformity of jet arrays have mainly centered on optimizing voltage source electrical parameters and the gas medium flow rate, adding current-limiting devices, and addition of small amounts of electronegative gas. Cao et al [18] reported that voltage frequency significantly affects the downstream uniformity of 2-D arrays; Hu et al [19] designed a 2-D jet array with three jets driven by a radio-frequency pulse and direct-current pulse voltage to generate parallel plumes beams and divergent plume beams, respectively. Fan et al [20] found that the conduction current of a singleelectrode configuration array decreases as gas flow rate increases, which drives down the repulsion between jets.…”

Section: Introductionmentioning

confidence: 99%

XJTU: Typical Arrangements for Downstream Uniformity Assessment in Atmospheric-Pressure Plasma Jet Arrays

et al. 2020

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The downstream uniformity of the atmospheric-pressure plasma jet array is a key technical problem in regards to large-scale applications. This paper presents a 2-D array device of five jets arranged in four different shapes designed from the perspective of symmetry. Various schemes were tested to determine the effects of jet arrangement on the downstream uniformity of the array: the completely symmetrical array X, the completely asymmetrical array J, and semi-symmetrical arrays T and U. The interactions in the arrays were observed via optical imaging as well as electrical and spectroscopic characterizations. The results show that the downstream plume pattern markedly changes with the jet arrangement. Peripheral plumes suppress the internal plumes to varying extent under different jet arrangements. The emission intensity of the helium line at 706.5 nm was taken as a criterion to find that downstream uniformity under the arrangements J, T, U, and X gradually decreases as the jet arrangement grows increasingly symmetrical. The electric field simulation shows that different jet arrangements cause various degrees of inhomogeneous electric field distributions, which in turn affect the charge transferred into each plasma jet and the distributions of active particles resulting in downstream uniformity variations. The results presented here may provide a theoretical foundation for improving the downstream uniformity of the plasma jet arrays and achieving large-scale plasma jet sources.

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The effect of applied electric field on pulsed radio frequency and pulsed direct current plasma jet array

Cited by 31 publications

References 22 publications

The effect of working gas impurities on plasma jets

The effect of working gas impurities on plasma jets

Numerical study on the gas heating mechanism in pulse-modulated radio-frequency glow discharge

XJTU: Typical Arrangements for Downstream Uniformity Assessment in Atmospheric-Pressure Plasma Jet Arrays

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