Guided plasma jets directed onto wet surfaces: angular dependence and control
Guided plasma jets directed onto wet surfaces: angular dependence and control
复制标题
引导等离子体射流定向到潮湿表面：角度依赖性和控制
DOI：
10.1088/1361-6463/abbf1a
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Kushner, Mark J
中科院分区：
文献类型：
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作者：
Parsey, Guy;Lietz, Amanda M;Kushner, Mark J
大气压等离子射流（APPJs）用于处理无机、有机和液体表面的最佳用途取决于能够控制等离子体产生的反应物质在表面上的流动。典型的APPJ是一种稀有气体混合物（RGM）流经一个施加电压的管，产生延伸到周围空气中的RGM等离子体羽流。由于电离波（IW）传播到空气中所需的较高电场，RGM等离子体羽流被周围的空气所引导。环境空气与RGM等离子体羽流的混合决定了活性氧和活性氮（RONS）的产生。APPJ通常垂直于被处理的表面。然而，APPJ相对于表面的角度可能是一种控制由于APPJ传播特性和由此产生的气体动力学的变化而产生的反应物质到表面的方法。在本文中，我们讨论了计算和实验研究的结果，解决了两个问题：有和没有导流气罩的APPJ中IWs的传播作为APPJ相对于表面角度的函数；并利用这个角度控制等离子体激活薄水层。我们发现，从等离子体管传播到相同气体环境的appj缺乏叶冠引导射流的定向特性，并且随着等离子体管角度的改变，appj在很大程度上遵循电场线。当角度改变时，导向APPJs与管同轴传播，并在表面上方几毫米处垂直转向表面。APPJ的角度会产生不同的气体动态分布，从而在一定程度上控制转移到薄水层的ron的含量。
The optimal use of atmospheric pressure plasma jets (APPJs) for treatment of surfaces—inorganic, organic and liquid—depends on being able to control the flow of plasma-generated reactive species onto the surface. The typical APPJ is a rare gas mixture (RGM) flowed through a tube to which voltage is applied, producing an RGM plasma plume that extends into the ambient air. The RGM plasma plume is guided by a surrounding shroud of air due to the higher electric field required for an ionization wave (IW) to propagate into the air. The mixing of the ambient air with the RGM plasma plume then determines the production of reactive oxygen and nitrogen species (RONS). The APPJ is usually oriented perpendicular to the surface being treated. However, the angle of the APPJ with respect to the surface may be a method to control the production of reactive species to the surface due to the change in APPJ propagation properties and the resulting gas dynamics. In this paper, we discuss results from computational and experimental investigations addressing two points—propagation of IWs in APPJs with and without a guiding gas shroud as a function of angle of the APPJ with respect to the surface; and the use of this angle to control plasma activation of thin water layers. We found that APPJs propagating out of the plasma tube into a same-gas environment lack any of the directional properties of shroud-guided jets, and largely follow electric field lines as the angle of the plasma tube is changed. Guided APPJs propagate coaxially with the tube as the angle is changed, and turn perpendicularly towards the surface only a few mm above the surface. The angle of the APPJ produces different gas dynamic distributions, which enable some degree of control over the content of RONS transferred to thin water layers.