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NUMERICAL STUDY OF THE REACTIVE SPECIES

机译：反应物种的数值研究

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摘要

Local thermodynamic equilibrium (LTE), frequently used as first approximation in modeling of thermal plasma processes, is sometimes unable to explain experimental results. It is particularly true near a wall and a surface impacted by the plasma jet. In this work, a 2-D custom model using the CFD commercial code Fluent was developed for argon-oxygen inductively coupled plasma (ICP) at atmospheric pressure. The assumption of thermal equilibrium was made but not that of chemical equilibrium. The transport properties were calculated using higher-order approximation of Chapman-Enskog theory. Reaction kinetics rates of dissociation and ionization were also considered. The model was applied to a process torch used for carving experiments on graphite, and the distribution of reactive species brought to the surface was analyzed in terms of reaction rate distribution: the experimental effect of different injection geometries on the distribution of the reaction rate is qualitatively reproduced by the model.
机译：局部热力学平衡（LTE）通常在热等离子体过程的建模中经常被用作第一近似，但有时无法解释实验结果。在受等离子体射流撞击的壁和表面附近尤其如此。在这项工作中，开发了使用CFD商业代码Fluent的2-D定制模型，用于在大气压下用于氩氧感应耦合等离子体（ICP）。假设热平衡，但不考虑化学平衡。使用Chapman-Enskog理论的高阶近似来计算运输性质。还考虑了解离和电离的反应动力学速率。将该模型应用于在石墨上进行雕刻实验的工艺炬，并根据反应速率分布分析了带入表面的反应性物种的分布：定性地研究了不同注入几何形状对反应速率分布的实验影响由模型复制。

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