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Low Reynolds number effects on jets issuing from round and elliptic orifices

DOI: 10.1615/ICHMT.2015.THMT-15.340
pages 215-218

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

Sinopsis

An experimental study was undertaken to investigate Reynolds number effects on mixing characteristics and turbulent transport phenomena in the near and intermediate regions of free orifice jets. The cross-sections examined were round, ellipses with aspect ratio 2 and 3. For each orifice cross-section, detailed velocity measurements were made at 4 Reynolds numbers: 2500, 4300, 8500 and 17000 using a particle image velocimetry. The results show different characteristics in the major and minor planes of ellipses with aspect ratio 2 and 3 including spread rate. Also an increase in Reynolds number leads to a narrower jet. Furthermore, the streamwise locations of axis-switching points of both elliptic nozzles are almost independent of Reynolds number not only for half-velocity width but also for the other velocity widths.

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