Flow transition in a small scale microwave plasma jet at atmospheric pressure

被引：35
|
作者：
Arnoult, G. [1 ]
Cardoso, R. P. [1 ]
Belmonte, T. [1 ]
Henrion, G. [1 ]
机构：
[1] Nancy Univ, CNRS, Lab Sci & Genie Surfaces, CS 14234, F-54042 Nancy, France
来源：
APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 19期
关键词：
discharges (electric); laminar flow; laminar to turbulent transitions; plasma jets; subsonic flow; supersonic flow; transonic flow; turbulence;
D O I：
10.1063/1.3025564
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A small-scale microwave postdischarge at atmospheric pressure is studied. Its shape evolves from a straight beam of light to a diverging cone. By using the method of the synthetic spectrum, the mean temperature is shown to vary nonlinearly between 1000 and 2000 K. Evaluation of the Reynolds number shows a linear dependence on flow rate and suggests a transition from laminar to turbulent flow. Simultaneously, the gas velocity increases and comes to exceed sound velocity. As the flow rate increases, three flow regimes are distinguished: laminar and subsonic, turbulent and transonic, and turbulent and supersonic.
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页数：3
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