Title :
Laminar-to-Turbulent Transition of a DC Helium/Oxygen (2%) Plasma Microjet
Author :
Wang, Ruixue ; Zhu, WeiDong ; Re, Justin Lo ; Zhang, Jue ; Fang, Jing ; Lopez, Jose L.
Author_Institution :
Acad. for Adv. Interdiscipl. Studies, Peking Univ., Beijing, China
Abstract :
A direct current plasma microjet is generated from a microhollow cathode discharge device in air with helium and oxygen (2%) as working gas. With the increase of the gas flow rate, a laminar-to-turbulent transition was found at a flow rate between 2.5 and 3.0 slm. The corresponding critical Reynolds number is calculated to be between 639 and 768. A stable bifurcation of the jet tip is observed with a transition flow when a nozzle with a 400- μm diameter opening is used.
Keywords :
bifurcation; glow discharges; helium; laminar to turbulent transitions; oxygen; plasma jets; plasma turbulence; DC helium-oxygen plasma microjet; He-O2; critical Reynolds number; direct current plasma microjet; gas flow rate; jet tip; laminar-to-turbulent transition; microhollow cathode discharge device; nozzle; size 400 mum; stable bifurcation; transition flow; working gas; Bifurcation; Copper; Electrodes; Electron tubes; Helium; Plasmas; Microhollow cathode; Reynolds number; plasma jet;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2011.2139230
