Investigation of plasma dynamics and spatially varying O and OH concentrations in atmospheric pressure plasma jets impinging on glass, water and metal substrates
Investigation of plasma dynamics and spatially varying O and OH concentrations in atmospheric pressure plasma jets impinging on glass, water and metal substrates
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DOI：
10.1088/1361-6595/aac618
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发表时间：
2018-06
影响因子：
3.8
通讯作者：
Y. Yue;X. Pei;Dogan Gidon;Fan Wu;Shuqun Wu;Xinpei Lu
中科院分区：
文献类型：
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作者：
Y. Yue;X. Pei;Dogan Gidon;Fan Wu;Shuqun Wu;Xinpei Lu
大气压等离子体射流（APPJ）在过去十年中引起了相当大的关注，特别是用于表面工程。为了研究等离子体对不同表面的撞击，对脉冲直流电压驱动的APPJ进行了比较研究。本文采用快速成像技术，研究了介质玻璃、蒸馏水和金属板三种基片上气体流速和组分的影响。除了与上升和下降电压相关联的放电之外，在水和金属表面的脉冲期间观察到所谓的第三次放电，其对应于从表面到喷嘴的再击穿。观察到的等离子体动力学的差异主要归因于衬底电导率的差异。此外，通过激光诱导荧光（LIF）研究了OH和O浓度的时空分布。OH/O LIF强度被发现是高得多的金属和水基板相比，玻璃板。我们将这种效应归因于与第三次放电的存在和强度相关的功耗差异。气体流量和种子气体（H2O和O2）的混合对LIF增强的影响进行了研究。相关结果为优化反应性物种的产生提供了额外的见解。
Atmospheric pressure plasma jets (APPJs) have attracted considerable attention over the last decade, specifically for use in surface engineering. A comparative study of an APPJ, driven by pulsed DC voltage, is conducted in order to examine the plasma impingement onto different surfaces. In this paper, the effect of gas flow rate and composition is investigated using three kinds of substrates: dielectric glass, distilled water and metal plate using fast imaging. Alongside discharges associated with rising and falling voltage, a so-called third discharge is observed during the pulse for water and metal surfaces which corresponds to a restrike breakdown from surfaces to nozzle. The differences in plasma dynamics observed are mainly attributed to the differences in substrate conductivity. In addition, spatial and temporal distributions of OH and O density are investigated by means of laser induced fluorescence (LIF). The OH/O LIF intensity is found to be much higher for metal and water substrates compared to the glass plate. We attribute this effect to the differences in power dissipation associated with the presence and intensity of the third discharge. Effects of gas flow rate and seed gas (H2O and O2) mixing on the LIF enhancement are also studied. The related results provide additional insights for optimizing the generation of reactive species.