Cathode fall characteristics in a dc atmospheric pressure glow discharge
Cathode fall characteristics in a dc atmospheric pressure glow discharge
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DOI：
10.1063/1.1615296
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发表时间：
2003-10
影响因子：
3.2
通讯作者：
Jianjun Shi;M. Kong
中科院分区：
文献类型：
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作者：
Jianjun Shi;M. Kong
大气压辉光放电是有吸引力的广泛的材料加工应用，主要是由于其操作的灵活性所提供的去除真空系统。这些相对较新的大气等离子体是非平衡等离子体，气体温度约为100 °C，电子温度在1-10 eV范围内。它们的外观特征是弥散和均匀的，它们的时间特征是重复和稳定的。在已报道的大气辉光放电的数值研究中，大多数是基于流体动力学近似，其中电子被假定为与局部电场处于平衡。然而，光谱和电气测量表明，阴极下降区是从根本上不平衡。为此，我们考虑一个混合模型，处理阴极下降区域动力学，但保留薄阴极下降层和阳极之间的区域的流体动力学描述。利用此混合模型，氦放电系统执行…
Atmospheric pressure glow discharges are attractive for a wide range of material-processing applications largely due to their operation flexibility afforded by removal of the vacuum system. These relatively new atmospheric plasmas are nonequilibrium plasmas with gas temperature around 100 °C and electron temperature in the 1–10 eV range. Their appearance is characteristically diffuse and uniform, and their temporal features are repetitive and stable. Of the reported numerical studies of atmospheric glow discharges, most are based on the hydrodynamic approximation in which electrons are assumed to be in equilibrium with the local electric field. Spectroscopic and electrical measurements suggest however that the cathode fall region is fundamentally nonequilibrium. To this end we consider a hybrid model that treats the cathode fall region kinetically but retains a hydrodynamic description for the region between the thin cathode fall layer and the anode. Using this hybrid model, a helium discharge system exci...