Comparative study of the structure of gas-stabilized and water-stabilized plasma jets |
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Authors: | S Raghu G Goutevenier R Gansert |
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Affiliation: | (1) Department of Mechanical Engineering, State University of New York, 11794 Stony Brook, NY;(2) Department of Materials Science and Engineering, State University of New York, 11794 Stony Brook, NY |
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Abstract: | The near-field structures of a gas- stabilized plasma jet and a water-stabilized plasma jet were investigated using a nano-pulsed
laser probe and stroboscopic focusing schlieren techniques. The high exit temof the gas caused laminar flow conditions at
the exit of the jet, producing instability waves in the region. Significant heat conduction to the ambient fluid and volumetric
expansion of the ambient gases in the near- field were observed in the schlieren images of these jets. Considerable asymmetry
in the mixing and entrainment region of the water- stabilized plasma jet was also visible, whereas no significant asymmetry
occurred in the luminous core of the jet. The particles injected into the plasma jet, which were visualized by the pulsed-
laser technique, were confined to a narrow central core of the jet in the near- field of the jet. The combination of the two
visualization techniques used in the present study allowed nonintrusive monitoring of the plasma spray process in an effort
to enhance the quality of the processed deposits. |
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Keywords: | jet spreading plasma jets schlieren technique waterstabilized plasma |
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