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Effect of nozzle geometry on mixing in turbulent free orifice jets

DOI: 10.1615/ICHMT.2015.THMT-15.920
pages 447-450

Y. Y. Afriyie
Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB, Canada, R3T 5V6

S.S. Aleyasin
1Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB, Canada, R3T 5V6

Mark F. Tachie
Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg MB, R3T 5V6 Canada

M. Koupriyanov
Price Industries Limited, 638 Raleigh St., Winnipeg, MB, Canada R2K 3Z9

T. Epp
Price Industries Limited, 638 Raleigh St., Winnipeg, MB, Canada R2K 3Z9

Abstract

Particle image velocimetry (PIV) technique was used to perform velocity measurements in the near and developing regions of orifice jets to determine the effect of nozzle geometry on the flow field. The orifice geometries studied include round, square, rectangle and ellipse (of aspect ratio 2). The Reynolds number based on equivalent diameter (d) of the nozzles was kept constant at approximately Red = 5400. The rectangular and elliptical nozzles show greater mass entrainment, higher spread rates and greater Reynolds shear stress levels when compared to the square and round nozzles.

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