Ar-MIP在石英管内传热与流动特征研究

Study on heat transfer and flow characteristics of Ar-MIP

摘要:

本文利用有限元方法建立了大气压下微波氩等离子体(Ar-MIP)三维模型，数值仿真了氩等离子体在不同时刻的温度、压强、速度等参数的空间分布情况，分析了这些参数的相互影响，探究微波等离子体流动瞬态特征. 研究结果表明: 等离子体气体温度随着时间增加而增加，其高温分布呈现空间不均匀，导致气压的局部变化，影响了流体的流速和流向，形成热流绕热现象，这是导致炬管内高温区域流体速度减缓的主要原因.

Abstract:

A 3-D model of microwave argon plasma (Ar-MIP) under atmospheric pressure is established with the finite element method to describe the temporal and spatial distribution of plasma temperature, pressure, and velocity. The interaction of these parameters is studied to explore the mechanism of microwave plasma excitation. The results show that the plasma temperature increases upon increasing the time, and the high temperature distribution exhibits spatial inhomogeneity, which causes the local changes in gas pressure and affects the flow velocity leading the thermal flow around the heat area. This is the reason that the fluid in high temperature region slows down.