Expansion dynamics of atmospheric pressure helium plasma jet in ambient air

Prakash, G. Veda; Patel, Kiran; Behera, Narayan; Kumar, Ajai

doi:10.1016/j.physleta.2020.126497

Cited by 17 publications

(11 citation statements)

References 24 publications

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“…2, it is clear that the emission intensity of the plasma jet increases from the glass nozzle to the plasma jet tip. Moreover, it has been observed that the electron density of the expanding helium plasma jet also increases from the glass nozzle to the plasma jet tip [17,18]. For the present experiment, the plasma density from glass nozzle to jet tip is in the range (0.069-5.96) × 10 12 cm −3 .…”

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confidence: 44%

“…Experimental scheme. -A detailed description of the experimental setup has been reported in the earlier reports [17,18]. A summary that is important for the present work is provided here.…”

mentioning

confidence: 99%

“…feature of the plasma jet in ambient air [17,18], which was ignored in the past. In this line, the Atomic Data and Analysis Structure (ADAS) can be used as a tool to study cold atmospheric-pressure plasma.…”

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confidence: 99%

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Study of increment of emission intensity in a cold atmospheric pressure helium plasma jet using the ADAS

Behera¹,

Prakash²

2023

EPL

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In this paper, the Atomic Data and Analysis Structure (ADAS) has been used to study the cold atmospheric pressure plasma jet. Variation of emission intensity pattern from glass nozzle to the plasma jet tip of a helium plasma jet in ambient air has been observed from the intensified charge-coupled device (ICCD) camera image. The increase of intensity pattern towards the plasma jet tip is an important and fundamental feature of the plasma jet in ambient air. The correlation of this observed pattern with electron impact processes has been studied by computing photon emissivity coefficients (PEC) using the ADAS. The role of various atomic processes involved in this study has also been discussed.

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confidence: 44%

“…Experimental scheme. -A detailed description of the experimental setup has been reported in the earlier reports [17,18]. A summary that is important for the present work is provided here.…”

mentioning

confidence: 99%

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Study of increment of emission intensity in a cold atmospheric pressure helium plasma jet using the ADAS

Behera¹,

Prakash²

2023

EPL

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“…[1][2][3][4][5][6][7][8] To understand and optimize the fundamental properties of these types of discharges, various plasma jet devices have been developed and studied in recent years. [1,4,[9][10][11][12] Among them, the RF plasma jets have several advantages (over the low-frequency counterparts), like low breakdown voltage, high electron density, and more reactive species generation, etc. [6,[13][14][15][16] Extensive studies are reported in this direction to understand the characteristics of RF plasma jet in terms of discharge modes, dynamics of charged particles, plasma parameters etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of pulse modulation frequency on helium RF atmospheric pressure plasma jet characteristics

Mahreen

Prakash

Kar

et al. 2022

Contributions to Plasma Physics

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This work investigates the influence of pulse modulation frequency ranging from 50 Hz–10 kHz on the helium RF atmospheric pressure plasma jet's fundamental characteristics. The impact of modulation frequency on plasma jet discharge behaviour, geometrical variation, reactive species emission, and plasma parameters (gas temperature Tg, electron excitation temperature Texc, and electron density (ne)) are studied using various diagnostics such as optical imaging, emission spectra, and thermal diagnostic. From the experiments, it is observed that operating the plasma jet at low pulse modulation frequencies (around 50 Hz) provides enhanced plasma dimensions, higher electron densities and greater optical emission from reactive species (viz., He I, O, OH, N2+, etc.) as compared to the higher modulation frequencies. Besides the low power consumption, three times less gas temperature of the modulated plasma jet than the continuous wave mode makes it more advantageous for the applications. Moreover, the influence of duty cycle (D) and applied RF power (P) on the plasma jet characteristics are also discussed. It is found that 10–40% duty cycle operation provides the most favourable attributes. More importantly, the concern of shorter plasma length in RF plasma jets is overcome by operating at 10–20% duty cycle with increased applied power. This work thoroughly characterizes helium atmospheric pressure RF plasma jet with a wide range of pulse mode operating parameters, which could help to select appropriate operating conditions for various industrial and biomedical applications.

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“…Their results proved that the influence of different components of shielding gas on cancer cells was controllable. Shirafuji [17], Pinchuk [18], and Prakash [19] also used experiments to prove that ambient gas could affect the diffusion of plasma jets in the surrounding air, and that shielding gas could inhibit the diffusion of plasma jets. Akishev et al [20] studied the transversal spreading of a plasma jet at its impinging the surface.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the spreading effect of atmospheric pressure microplasma jet treatment through shielding-gas-controlled focusing

Lv¹,

Chen²,

Wang³

et al. 2022

Plasma Sci. Technol.

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Atmospheric pressure cold microplasma jet (APμPJ) has been widely used in material processing. However, the etched area is often larger than the jet orifice due to the expansion of the microplasma. For high processing accuracy, it is essential to precisely control the jet diameter. In this paper, a two-dimensional axisymmetric simulation model is established to analyze the effect of nitrogen (N2) shielding gas on helium (He) from gas dynamics. In addition, by etching the Polyethylene terephthalate (PET) film, the relationship between the etching effect and aerodynamic analysis was verified. The simulation results are similar to the experimental results, indicating that N2 shielding gas has a focusing effect, which is related to the N2 flow rate, the distance difference between the inner and outer tubes, and outer tube nozzle diameter. It is hoped that the results of this paper can provide a certain reference for the use of shielding gas to control the jet flow of APμPJ.

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Expansion dynamics of atmospheric pressure helium plasma jet in ambient air

Cited by 17 publications

References 24 publications

Study of increment of emission intensity in a cold atmospheric pressure helium plasma jet using the ADAS

Study of increment of emission intensity in a cold atmospheric pressure helium plasma jet using the ADAS

Influence of pulse modulation frequency on helium RF atmospheric pressure plasma jet characteristics

Improvement of the spreading effect of atmospheric pressure microplasma jet treatment through shielding-gas-controlled focusing

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