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Type: Journal article
Title: On turbulent jets issuing from notched-rectangular and circular orifice plates
Author: Mi, J.
Kalt, P.
Nathan, G.
Citation: Flow Turbulence and Combustion, 2010; 84(4):565-582
Publisher: Kluwer Academic Publ
Issue Date: 2010
ISSN: 1386-6184
Statement of
Jianchun Mi, P. Kalt and G.J.Nathan
Abstract: This paper reports an experimental investigation of the near-field flow characteristics of two air/air turbulent jets issuing respectively from notched-rectangular and circular orifice plates with identical opening areas or equivalent diameters (D e ). Planar particle image velocimetry (PIV) was used to measure the velocity field at the same Reynolds number, based on D e , of Re = 72,000. Consistent with previous work on other noncircular jets, the present study finds that the notched jet has a higher rate of mixing than does the circular counterpart. In particular, this jet in the very near field transfers its momentum to the surroundings at a greater rate, evidenced by a notably shorter unmixed core and faster turbulence intensity growth. The higher rates of overall decay and spread of the notched jet are maintained over the entire measurement region and likely beyond. In addition, the phenomenon of axis switching is also found to occur in this jet.
Keywords: Noncircular jet, Free jet, Turbulence mixing and Axis-switching
Description: First published online in 2009
Rights: © 2009 Springer. Part of Springer Science+Business Media
RMID: 0020093653
DOI: 10.1007/s10494-009-9239-6
Appears in Collections:Mechanical Engineering publications
Environment Institute Leaders publications

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