非平衡状态下H35和F5等离子切割混合物的热力学和输运性质

V. Colombo, E. Ghedini, P. Sanibondi
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引用次数: 2

摘要

等离子体科学是一个使用建模来理解和预测等离子体放电物理行为的重要领域。等离子体建模的一个应用是等离子体电弧切割装置,其特点是部分电离等离子体,并根据应用使用各种各样的气体混合物。了解这些混合物的热力学和输运性质是对这些装置进行正确模拟的必要前提。由于缺乏实验数据,对于300K到40000K范围内各种各样的混合物,获得这些系数的最可靠的方法是求解玻尔兹曼方程的Chapman-Enskog方法。在该方法中,假定物种的分布函数为一阶摄动麦克斯韦分布。在这些工作中,作者利用Bonnefoi电子和重粒子解耦方法计算了H35(65%氩和35%氢)和F5(95%氮和5%氢)混合物的非平衡组成、热力学和输运性质,并给出了一些结果。将结果与以前发表的报告中的数据进行比较,以检查其准确性。
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Thermodynamic and transport properties of H35 and F5 plasma cutting mixtures in non-equilibrium
Plasma science is a field in which modeling is used to play an important role for understanding and predicting the physical behavior of a plasma discharge. An application of plasma modeling is on plasma arc cutting devices which are characterized by a partially ionized plasma and by the use a of wide variety of gas mixtures, depending on the application. Knowledge of the thermodynamic and transport properties of these mixtures is a necessary prerequisite in order to perform correct simulations of these devices. Due to the lack of experimental data, the most reliable way to obtain these coefficients, for a wide variety of mixtures in the range of 300K to 40000K, is the Chapman-Enskog method for the solution of the Boltzmann equation. In this method the distribution function of the species is assumed to be a first order perturbed Maxwellian distribution. In these work some results are presented for H35 (argon 65% and hydrogen 35%) and F5 (nitrogen 95% and hydrogen 5%) mixtures using numerical codes developed by the authors for the calculation of nonequilibrium composition, thermodynamic and transport properties using the Bonnefoi electron and heavy particles decoupling approach. Results are compared with data available from previously published reports to check their accuracy.
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