Global model of cold atmospheric He plus air plasmas: A comparison of Maxwellian and non-Maxwellian EEDFs

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Global model of cold atmospheric He plus air plasmas: A comparison of Maxwellian and non-Maxwellian EEDFs

机译：寒冷大气的全球模型加上空气等离子体：克斯威尔和非最大世界的EEDFS比较

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The electron energy distribution function (EEDF) of cold atmospheric plasmas (CAPs) is often assumed to be Maxwellian, but it is actually non-Maxwellian, as calculated from the Boltzmann equation. To determine the impact of the Maxwellian assumption, two global models with Maxwellian and non-Maxwellian EEDFs are developed for the He + air CAPs, and the resulting discharge characteristics and reactive species are compared. With the increasing air concentration from 100 to 50 000 ppm in He + air feeding gas, the simulation results of both global models display similar trends, and the orders of the densities of both global models are similar for the reactive species and each air concentration scenario. However, the Maxwellian assumption leads to lower electron temperature, weaker electronegativity, less power dissipation to Ion Joule heating, higher densities, and lagging peak points for most types of reactive species compared to using the non-Maxwellian EEDF. These findings indicate that the Maxwellian assumption is capable of capturing the main physicochemical features of He + air CAPs, but it can lead to large calculation errors at the quantitative level.

机译：冷大气等离子体（帽）的电子能量分布函数（EEDF）通常被认为是MaxWellian，但实际上是非麦克斯韦尔，如来自Boltzmann方程计算的。为了确定Maxwellian假设的影响，为HE +空气盖开发了两个带有Maxwellian和非最大世界EEDF的全球模型，并比较了所得到的放电特性和反应性物种。随着IN +空气进料气中的100至50 000ppm的空气浓度增加，全球模型的仿真结果显示了类似的趋势，以及全球模型的密度的顺序类似于反应性物种和每个空气集中场景。然而，MaxWellian假设导致电气温度较低，电阻较弱，较少的电力耗散，对离子焦耳加热，更高的密度，与使用非Maxwellian EEDF相比，对大多数类型的反应物种进行最高密度和滞后峰值。这些调查结果表明，克斯威尔人的假设能够捕获他+空气帽的主要物理化学特征，但它可以在定量水平处导致大的计算误差。

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《Physics of plasmas》 |2019年第12期|共9页
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中图分类等离子体物理学;
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Global model of cold atmospheric He plus air plasmas: A comparison of Maxwellian and non-Maxwellian EEDFs

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