1. LIF diagnostics of hydroxyl radical in a methanol containing atmospheric-pressure plasma jet.
- Author
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Mu-Yang Qian, San-Qiu Liu, Xue-Kai Pei, Xin-Pei Lu, Jia-Liang Zhang, and De-Zhen Wang
- Subjects
LASER-induced fluorescence ,PLASMA diagnostics ,HYDROXYL group ,METHANOL ,ATMOSPHERIC pressure ,PLASMA jets - Abstract
In this paper, a pulsed-dc CH
3 OH/Ar plasma jet generated at atmospheric pressure is studied by laser-induced fluorescence (LIF) and optical emission spectroscopy (OES). A gas–liquid bubbler system is proposed to introduce the methanol vapor into the argon gas, and the CH3 OH/Ar volume ratio is kept constant at about 0.1%. Discharge occurs in a 6-mm needle-to-ring gap in an atmospheric-pressure CH3 OH/Ar mixture. The space-resolved distributions of OH LIF inside and outside the nozzle exhibit distinctly different behaviors. And, different production mechanisms of OH radicals in the needle-to-ring discharge gap and afterglow of plasma jet are discussed. Besides, the optical emission lines of carbonaceous species, such as CH, CN, and C2 radicals, are identified in the CH3 OH/Ar plasma jet. Finally, the influences of operating parameters (applied voltage magnitude, pulse frequency, pulsewidth) on the OH radical density are also presented and analyzed. [ABSTRACT FROM AUTHOR]- Published
- 2016
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