Surface ionization waves propagating over non-planar substrates: wavy surfaces, cut-pores and droplets
Surface ionization waves propagating over non-planar substrates: wavy surfaces, cut-pores and droplets
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DOI：
10.1088/1361-6595/ac9a6c
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发表时间：
2022-10
影响因子：
3.8
通讯作者：
K. Konina;Juliusz Kruszelnicki;M. Meyer;M. Kushner
中科院分区：
文献类型：
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作者：
K. Konina;Juliusz Kruszelnicki;M. Meyer;M. Kushner
与电介质表面相交的大气压等离子体通常会转变为表面电离波（SIW）。这些放电的一些应用被特意配置为 SIW。 SIW 在电介质表面上传播期间，等离子体对表面充电，同时响应几何和电气材料特性的变化。这对于非平面表面尤其重要，其中电介质的极化导致局部电场增强。在本文中，我们讨论了负 SIW 和正 SIW 在三种配置的非平面电介质上传播的计算研究结果：波状表面、穿透多孔材料和平坦表面上的水滴。我们发现负 SIW 对非平面表面波峰处的电场增强特别敏感。电场增强导致的电离率局部增加可能导致 SIW 从表面分离，从而产生表面的不均匀等离子体暴露。正 SIW 倾向于更大程度地粘附在表面上。这些趋势表明，对表面含有病原体的液滴的处理最好通过阳性 SIW 进行。同样的原理也适用于穿过孔隙的表面。 SIW 具有小开口的埋孔可以通过等离子体流入孔（大开口）或通过光电离（小开口）引发等离子填充，具体取决于与德拜长度相比的开口大小。
Atmospheric pressure plasmas intersecting with dielectric surfaces will often transition into surface ionization waves (SIWs). Several applications of these discharges are purposely configured to be SIWs. During propagation of an SIW over a dielectric surface, the plasma charges the surface while responding to changes in geometrical and electrical material properties. This is particularly important for non-planar surfaces where polarization of the dielectric results in local electric field enhancement. In this paper, we discuss results from computational investigations of negative and positive SIWs propagating over nonplanar dielectrics in three configurations—wavy surfaces, cuts through porous materials and water droplets on flat surfaces. We found that negative SIWs are particularly sensitive to the electric field enhancement that occurs at the crests of non-planar surfaces. The local increase in ionization rates by the electric field enhancement can result in the SIW detaching from the surface, which produces non-uniform plasma exposure of the surface. Positive SIWs tend to adhere to the surface to a greater degree. These trends indicate that treatment of pathogen containing droplets on surfaces may be best performed by positive SIWs. The same principles apply to the surfaces cut through pores. Buried pores with small openings to the SIW may be filled by plasma by either flow of plasma into the pore (large opening) or initiated by photoionization (small opening), depending on the size of the opening compared to the Debye length.