Numerical simulation of inductively coupled plasma flows under chemical non‐equilibrium
Numerical simulation of inductively coupled plasma flows under chemical non‐equilibrium
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DOI：
10.1108/09615530410532286
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发表时间：
2004-06
影响因子：
4.2
通讯作者：
G. Degrez;D. V. Abeele;P. Barbante;B. Bottin
中科院分区：
文献类型：
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作者：
G. Degrez;D. V. Abeele;P. Barbante;B. Bottin
本文详细介绍了局部热力学平衡和化学非平衡条件下电感耦合空气等离子体的数值模拟。首先，描述了物理化学模型，即热力学，传输现象和化学动力学模型。特别注意在多组分化学非平衡等离子体中双极扩散的正确建模。然后，讨论了数值方面的问题，即空间离散和迭代求解策略。最后，给出了空气电感耦合等离子体炬中的流场、温度场和化学品浓度场的计算结果。计算是在假设局部热力学平衡和化学非平衡的情况下进行的，其中使用了两种不同的有限速率化学模型。除了重要的非平衡效应外，我们还观察到氧和氮核的显著分层，这是由于扩散而发生的，而不管等离子体中的非平衡程度如何。
This paper presents a detailed review of the numerical modeling of inductively coupled air plasmas under local thermodynamic equilibrium and under chemical non‐equilibrium. First, the physico‐chemical models are described, i.e. the thermodynamics, transport phenomena and chemical kinetics models. Particular attention is given to the correct modelling of ambipolar diffusion in multi‐component chemical non‐equilibrium plasmas. Then, the numerical aspects are discussed, i.e. the space discretization and iterative solution strategies. Finally, computed results are presented for the flow, temperature and chemical concentration fields in an air inductively coupled plasma torch. Calculations are performed assuming local thermodynamic equilibrium and under chemical non‐equilibrium, where two different finite‐rate chemistry models are used. Besides important non‐equilibrium effects, we observe significant demixing of oxygen and nitrogen nuclei, which occurs due to diffusion regardless of the degree of non‐equilibrium in the plasma.