Numerical simulation of He atmospheric pressure plasma jet impinging on the tilted dielectric surface

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Applied Physics Pub Date : 2024-09-19 DOI:10.1063/5.0232639
Lijun Wang, Huan Zhao, Zhongji Han, Jie Liu
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Abstract

The target surface to be treated in reality is often not smooth and horizontal and may also be in different tilting angles. The treatment of the tilted dielectric surface by the atmospheric pressure plasma jet (APPJ) undoubtedly increases the complexity of surface modification. Therefore, a two-dimensional fluid model is established to reveal the internal mechanism of the interaction between the He APPJ and the tilted dielectric surface by means of numerical simulation. The distribution of the gas flow in a small angular range (0°, 3°, 5°, 8°, 10°, and 15°) is studied. In addition, the effects of the tilt angle on the jet morphology, discharge dynamic properties, and species distribution of the He APPJ are emphatically discussed. It is found that the jet morphology and parameters are no longer symmetrical under the tilted surface. With the increase in the tilt angle, the enhanced electric field in the upper surface region leads to the increase in the ionization rate and electron density here, and also accelerates the propagation speed of the jet to the dielectric surface in the atmospheric environment. Driven by the electric field force, the jet is closer to the dielectric surface, resulting in a decrease in the thickness of the cathode sheath and an increase in the surface charge density in the area to the right of the central axis. The influence of the gas flow structure leads to the shortening of the jet development distance and a decrease in the jet velocity on the upper surface. N and O also form higher fluxes on the upper surface due to the increase in the electron density.
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冲击倾斜介质表面的氦大气压等离子体射流的数值模拟
现实中需要处理的目标表面往往不是光滑和水平的,也可能处于不同的倾斜角度。用常压等离子体射流(APPJ)处理倾斜的介质表面无疑增加了表面改性的复杂性。因此,本文建立了一个二维流体模型,通过数值模拟揭示 He APPJ 与倾斜介质表面相互作用的内部机理。研究了气体流在较小角度范围(0°、3°、5°、8°、10°和 15°)内的分布。此外,还重点讨论了倾斜角对 He APPJ 的射流形态、放电动态特性和物种分布的影响。研究发现,在倾斜表面下,射流形态和参数不再对称。随着倾斜角的增大,上表面区域的电场增强导致这里的电离率和电子密度增加,同时也加快了大气环境中射流向介质表面的传播速度。在电场力的驱动下,射流更接近介质表面,导致阴极鞘厚度减小,中心轴右侧区域的表面电荷密度增大。气流结构的影响导致射流发展距离缩短,上表面的射流速度降低。由于电子密度的增加,N 和 O 在上表面也形成了较高的通量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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