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Turbulence and entrainment in an atmospheric pressure dielectric barrier plasma jet
Author(s) -
Morabit Youssef,
Whalley Richard D.,
Robert Eric,
Hasan Mohammad I.,
Walsh James L.
Publication year - 2020
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201900217
Subject(s) - plasma , entrainment (biomusicology) , turbulence , atomic physics , particle image velocimetry , atmospheric pressure plasma , laminar flow , jet (fluid) , mechanics , chemistry , materials science , physics , quantum mechanics , rhythm , acoustics
Particle image velocimetry, laser‐induced fluorescence, and computational modeling are used to quantify the impact of plasma generation on air entrainment into a helium plasma jet. It is demonstrated that discharge generation yields a minor increase in the exit velocity of the gas. In contrast, the laminar to turbulent transition point is strongly affected, attributed to an increase in plasma‐induced perturbations within the jet shear layer. The temporal decay of laser‐induced fluorescence from OH is used as an indicator of humid air within the plasma. The results show that plasma‐induced perturbations increase the quenching rate of the OH‐fluorescent state; indicating that shear‐layer instabilities play a major role in determining the physicochemical characteristics of the plasma.