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Simulation of Striations in DC Glow Discharges in Nitrogen

机译：氮气直流辉光放电条纹的模拟

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Summary form only given. Plasma Stratification that results in a self structured successive bright and dark region is a most widely observed instability phenomenon in dc glow discharges. Striations have been observed over a wide range of currents and pressures for different discharge configurations. Despite the large number of experimental studies reported in this topic, numerical modeling of the phenomenon is mostly limited to rare gases. In this study, we have developed a self-consistent fluid model of standing striations in nitrogen with detailed kinetics of vibrationally excited molecules. The model enabled us to simulate self-excited standing striations observed in Nitrogen dc glow discharges operating at moderate pressure (i.e., few Torrs) at the low current regime (0.02 - 0.35 mA) in a tube of radius 0.18 cm and length 8.5 cm. The one-dimensional model resolves the structure of discharge in the axial direction with the radial diffusion losses of charged species taken into account via an approximate loss term. The reaction kinetics having multiple vibrational excitation states consists of 26 species participating in 76 reactions. Simulations are conducted for a range of discharge current density (0.2 - 3.5 mA/cm
机译：仅提供摘要表格。导致自发光连续​​的明暗区域的等离子体分层是在直流辉光放电中最广泛观察到的不稳定性现象。对于不同的放电构造，已经在很宽的电流和压力范围内观察到条纹。尽管在此主题中进行了大量的实验研究，但该现象的数值模型主要限于稀有气体。在这项研究中，我们开发了一个自洽流体模型，该模型在氮气中具有稳定的条纹，并具有振动激发分子的详细动力学。该模型使我们能够模拟在半径为0.18 cm，长度为8.5 cm的灯管中以低电流（0.02-0.35 mA）在中等压力（即几托）下在氮气直流辉光放电中观察到的自激站立条纹。一维模型通过近似损耗项，考虑了带电物质的径向扩散损耗，从而解决了轴向放电的结构。具有多个振动激发态的反应动力学由参与76个反应的26种物质组成。针对一定范围的放电电流密度（0.2-3.5 mA / cm）进行了仿真

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