Investigation of gas flow dependence of plasma jet produced by pulsed power

Yamamoto, Akinori; Kawano, Yuzo; Nakai, Mizuki; Nakagawa, Toru; Sakugawa, Takashi; Hosseini, Hamid Reza Madaah; Akiyama, H.

doi:10.1109/tps.2015.2448132

Cited by 13 publications

(6 citation statements)

References 18 publications

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“…They also emphasized on the role of the argon mole fraction variation in the flow, resulting in plasma plume length variation, as firstly described by Karakas et al [10] in the case of a helium plasma jet. In several studies, the onset of a turbulent flow induced by the plasma [11,12] was associated to a reduction of the plasma plume length, due to a higher air mixing in the working flow [13,14]. In Darny et al [15], for neon and helium fed Plasma Gun (PG), it was reported that various complex stable plasma plume patterns were either obtained with pulse repetition rate variation for a fixed gas flow rate, or with flow rate variation for a fixed pulse repetition rate.…”

Section: Introductionmentioning

confidence: 99%

Plasma action on helium flow in cold atmospheric pressure plasma jet experiments

Darny¹,

Pouvesle²,

Fontane³

et al. 2017

Plasma Sources Sci. Technol.

105

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In this work, helium flow modifications, visualized by schlieren imaging, induced by the plasma generated in a plasma jet have been studied in conditions used for biomedical treatments (jet being directed downwards with a low helium flow rate). It has been shown that the plasma action can shift up to few centimeters downstream the effects of buoyancy, which allows to the helium flow to reach a target below in conditions for which it is not the case when the plasma is off. This study reveals the critical role of large and long lifetime negative ions during repetitive operations in the kHz regime, inducing strong modifications in the gas propagation. The cumulative added streamwise momentum transferred to ambient air surrounding molecules resulting from a series of applied voltage pulses induces a gradual built up of a helium channel on tens of millisecond timescale. In some conditions, a remarkable stable cylindrical helium channel can be generated to the target with plasma supplied by negative polarity voltage pulses whereas a disturbed flow results from positive polarity operation. This has a direct effect on air penetration in the helium channel and then on the reactive species production over the target which is of great importance for biomedical applications. It has also been shown that with an appropriate combination of negative and positive polarity pulses, it is possible to benefit from both polarity features in order to optimize the plasma plume propagation and plasma delivery to a target.

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Section: Introductionmentioning

confidence: 99%

Plasma action on helium flow in cold atmospheric pressure plasma jet experiments

Darny¹,

Pouvesle²,

Fontane³

et al. 2017

Plasma Sources Sci. Technol.

105

View full text Add to dashboard Cite

show abstract

“…For instance the authors in [25] obtained a 2-cmdiam plasma jet near atmospheric pressure by using three (a powered, a grounded and a floated) electrodes. Using dielectric tubes with different exit geometry, like a tapered or horn-like nozzle as reported in [26], changes the gas flow dynamics, which affects the length and size of the produced plasma jet. Yet, there is no comprehensive study about the effect of jet exit geometry on the size and the uniformity of plasmamodified area.…”

Section: Introductionmentioning

confidence: 99%

Uniform surface modification of polyethylene terephthalate (PET) by atmospheric pressure plasma jet with a horn-like nozzle

Mui

Mota

Quade

et al. 2018

Surface and Coatings Technology

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This work reports on surface modification of polyethylene terephthalate (PET) polymer by an atmospheric pressure plasma jet (APPJ) operated with argon. A distinguishable feature of this device is that it terminates with a conical horn-like nozzle. Three different nozzles diameters were employed with the purpose to obtain uniform surface modification over large area. Treatments in small 3D objects that fit inside the conical horn were also conducted. In this study, water contact angle (WCA) measurements and X-ray photoelectron spectroscopy (XPS) were performed to assess the samples wettability and the surface elemental composition, as well as, their radial distribution. Plasma-induced changes on the polymer surface morphology were evaluated by Atomic Force Microscopy (AFM). Electrical characterization of the plasma and investigation of the effect of the gas flow rate on the discharge power were carried out. After the plasma treatment PET surface became more hydrophilic over the entire area covered by the nozzle. This effect is caused by the incorporation of oxygen containing polar groups on the surface. It was also observed that depending on process parameters, the plasma treatment can extend even outside the area of the conical horn. The degree of surface modification depends on plasma dose while the treatment uniformity is determined mostly by the distance to the sample. Overall, a quite uniform surface modification was obtained over the entire area covered by the jet nozzle. Thus, the results suggest that by simply changing the jet geometry and choosing the right treatment parameters one can achieve a uniform treatment over an area whose size is determined by the horn diameter.

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“…First of all, simply increasing the diameter of dielectric tube is not a solution because it leads to excessively high gas flows and also intense electric fields are required for plasma ignition. Different geometry of the tube exit, like a tapered or horn-like nozzle investigated in [10], affects the length and size of produced plasma jet. The authors in [11] obtained a 2-cm-diam plasma jet by using three (a powered, a grounded and a floated) electrodes.…”

Section: Introductionmentioning

confidence: 99%

Enhanced energy transfer efficiency in a four-electrodes configuration DBD plasma jet

et al. 2017

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In this work a dielectric barrier discharge (DBD) plasma jet that uses a multiple electrodes configuration is investigated. The results show that both plasma power and its rotational and vibrational temperatures tend to increase with the number of powered electrodes in the DBD device. The emission intensities of the excited species in the plasma, and consequently their number density, also grow as a function of the number of powered electrodes. Based on these facts and since the electric power provided by the power supply was kept constant, there is an indication that the use of multiple electrodes improves the energy efficiency of the device.

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Investigation of gas flow dependence of plasma jet produced by pulsed power

Cited by 13 publications

References 18 publications

Plasma action on helium flow in cold atmospheric pressure plasma jet experiments

Plasma action on helium flow in cold atmospheric pressure plasma jet experiments

Uniform surface modification of polyethylene terephthalate (PET) by atmospheric pressure plasma jet with a horn-like nozzle

Enhanced energy transfer efficiency in a four-electrodes configuration DBD plasma jet

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