Turbulence and entrainment in an atmospheric pressure dielectric barrier plasma jet

Morabit, Youssef; Whalley, Richard D.; Robert, Éric; Hasan, M. I.; Walsh, James L.

doi:10.1002/ppap.201900217

Cited by 32 publications

(32 citation statements)

References 45 publications

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“…This could be the reason for the increase in the peak intensity of reactive species in atomic emission spectroscopy. [32][33][34] A very important point that can be mentioned about increasing the stability of plasma jets in the new structure is that it has been proven that the presence of static electricity effects from the previous plasma bullets can have a stimulating and contributing effect in the stabilization of plasma emission. And this function is continuously present by the surface electrical discharge structure on the inner dielectric surface in our jet nozzle.…”

Section: Resultsmentioning

confidence: 99%

The effect of modulated electric field on characteristic of SDBD‐like plasma jet for surface modification

Seyfi

Heidari

Khademi

et al. 2020

Contributions to Plasma Physics

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In this paper, the dynamics and flow behaviour of an atmospheric argon plasma jet was studied in the new nozzle structure similar to the surface dielectric barrier discharge (SDBD) using the Schlieren imaging method. The effect of plasma jet driven by repetitive high-voltage microsecond pulses with low-frequency sinusoidal bias was measured qualitatively in a single mirror Schlieren optical system. The enhancement of plasma jet length and cross-section of plasma jet with surface in this condition is due to highly turbulent flow of argon plasma jet in this structure. This study revealed the important role of SDBD structure and modulated electric field on the behaviour of plasma jet in a high diameter nozzle. In practice, this technique allows us to increase the jet length of the nozzle output to 5 cm and under these conditions, the diameter of the plasma jet cross-section is increased to 8 mm, without increasing the electrical power consumption. Eventually, the hydrophilicity of the surface is also measured by the contact angle of a water droplet that decreases from 78 • to 8 • after surface treatment, implying we were able to reach a super-hydrophilic surface with this plasma jet structure. K E Y W O R D S hydrophilicity, modulated electric field, plasma jet, Schlieren imaging, surface dielectric barrier discharge (SDBD)

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Section: Resultsmentioning

confidence: 99%

The effect of modulated electric field on characteristic of SDBD‐like plasma jet for surface modification

Seyfi

Heidari

Khademi

et al. 2020

Contributions to Plasma Physics

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“…In contrast to the behavior of the Ne emission, the line intensities of the NO increased remarkably with the increase in the voltage to 12 kV pp , which is attributed to two main factors: (i) the increase in the entrainment of the surrounding air into the jet by increasing the applied voltage [ 9 ] and (ii) the increase in the deposited energy by the increase in the applied voltage, which is favored for the dissociation of nitrogen molecules entrained from the surrounding air into the jet.…”

Section: Discussionmentioning

confidence: 99%

“…[ 8 ] As a result, the jet extinguishes after a certain distance from the tube nozzle. This mixing property of the ambient air is linked, in a complex manner, to the plume regime and pattern, [ 9 ] thereby affecting the jet characteristics and the treatment efficiency of the targeted materials. [ 10,11 ] The plume regime and pattern are, in turn, influenced by many factors, particularly the device configuration and the operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Distinctive patterns and characteristics of neon jet launched from plasma candle device

Abdelaziz

Kim

2020

Plasma Processes & Polymers

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This study reported the characterization of neon plasma jets emerging from a novel plasma device known as a plasma candle. The device launches stable, wide, and long cold plasmas in a shape resembling a flickering candle flame. The neon plasma candle (Ne‐PC) exhibited several interesting phenomena in terms of the discharge propagation and plume pattern, which are not common in other jet devices. A particular attention was paid to the dynamics of the gas flow, which was found to have significant effects on the discharge characteristics and jet shape. It is found that a porous disc in the Ne‐PC device distributed the gas flow uniformly, and subsequently enhanced the discharge initiation and formed a uniform conical jet. Moreover, the effect of the applied voltage on the flow dynamics led to a transformation in the conical shape of the jet to a fork‐like shape. This phenomenon did not appear in the helium plasma candle, and it is observed that the induced electrohydrodynamic (EHD) as well as the low velocity, diffusion coefficient, and momentum of the gas play a crucial role in this phenomenon. Optical emission spectroscopy measurements provided insights into the mechanism of the plume pattern and described its effect on the generated species. At higher applied voltages, a significant reduction in neon emissions was observed, but higher RONS were generated, due to the entrainment of the surrounding air. Furthermore, it is found that the Ne‐PC has a higher ability to generate RONS than the helium candle and neon in the conventional plasma jet devices (Ne‐CPJ), thereby suggesting its feasibility for material processing and biomedical applications.

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“…Morabit et al provided the first quantitative velocity measurements of a plasma jet impinging into ambient air, summarised in Fig. 5 [9]. The ensemble-averaged velocity measurements and normalised centreline velocity decay shows the transition to turbulence induced by the plasma discharge.…”

Section: Link Between Fluid Dynamics and Appj Physicochemical Propertiesmentioning

confidence: 99%

“…Several studies have probed the interaction via qualitative methods, such as Schlieren imaging [4][5][6][7][8], observing that plasma generation has a marked impact of the fluid dynamics of the system. Particle image velocimetry has been used to quantitatively study a free submerged axisymmetric plasma jet and characterise the plasma-induced turbulence [8,9]. Both qualitative and quantitative methods confirm that the presence of a discharge generated at kHz frequencies within a flowing gas results in perturbation of the jet flow and the early onset of turbulence [8,[10][11][12].…”

Section: Introductionmentioning

confidence: 96%

A review of the gas and liquid phase interactions in low-temperature plasma jets used for biomedical applications

et al. 2021

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Atmospheric pressure plasma jets generated using noble gases have been the focus of intense investigation for over 2 decades due to their unique physicochemical properties and their suitability for treating living tissues to elicit a controlled biological response. Such devices enable the generation of a non-equilibrium plasma to be spatially separated from its downstream point of application, simultaneously providing inherent safety, stability and reactivity. Underpinning key plasma mediated biological applications are the reactive oxygen and nitrogen species (RONS) created when molecular gases interact with the noble gas plasma, yielding a complex yet highly reactive chemical mixture. The interplay between the plasma physics, fluid dynamics and plasma chemistry ultimately dictates the chemical composition of the RONS arriving at a biological target. This contribution reviews recent developments in understanding of the interplay between the flowing plasma, the quiescent background and a biological target to promote the development of future plasma medical therapies. Graphical abstract

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Turbulence and entrainment in an atmospheric pressure dielectric barrier plasma jet

Cited by 32 publications

References 45 publications

The effect of modulated electric field on characteristic of SDBD‐like plasma jet for surface modification

The effect of modulated electric field on characteristic of SDBD‐like plasma jet for surface modification

Distinctive patterns and characteristics of neon jet launched from plasma candle device

A review of the gas and liquid phase interactions in low-temperature plasma jets used for biomedical applications

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