Mixing and magnetic effects on a nonequilibrium argon plasma jet
Mixing and magnetic effects on a nonequilibrium argon plasma jet
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非平衡氩等离子体射流的混合和磁效应
DOI：
10.1016/s1290-0729(00)01217-5
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发表时间：
2001
影响因子：
4.5
通讯作者：
H. Nishiyama
中科院分区：
文献类型：
--
作者：
Takehiko Sato;M. Shigeta;D. Kato;H. Nishiyama
实验研究了气体混合和外加磁场对非平衡Ar等离子体射流的影响。在Ar/He等离子体中，由于He的密度小、热导率大和马赫数效应，在核心区观察到最高气体温度和最高气体速度。此外，它们的径向梯度在所施加的磁场中变得非常陡峭。相比之下，气体的温度和气体速度的Ar/N2等离子体射流是不是那么高，它们的径向梯度是适度的，因为所需的能量损失，以离解N2气体在核心区域和在径向上的主动热扩散。与Ar/N2等离子体相比，Ar/Ar等离子体射流或Ar/He等离子体射流的情况下的电子数密度更大，因为N2气体在电离之前解离。结果表明，He或N2气体的掺混对非平衡Ar等离子体射流的流场和温度场也有可控的影响。
Effects of gas admixture and of an applied magnetic field on a nonequilibrium Ar plasma jet are investigated experimentally. The maximum gas temperature and gas velocity are observed in the core region of an Ar/He plasma due to the small density, the large thermal conductivity and Mach number effect of He. Furthermore, their radial gradients become very steep in the applied magnetic field. In contrast, the gas temperature and gas velocity of an Ar/N2plasma jet are not so high and their radial gradients are moderate, because of the energy loss needed to dissociate N2gas in the core region and of the active thermal diffusion in the radial direction. Electron number density is larger in the case of an Ar/Ar plasma jet or an Ar/He plasma jet compared with that of an Ar/N2plasma, since N2gas dissociates before ionization. It is shown that the admixing of He or N2gas influences controllably the flow and temperature fields of a nonequilibrium Ar plasma jet also in an applied magnetic field.