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THMT-15. Proceedings of the Eighth International Symposium On Turbulence Heat and Mass Transfer
September, 15-18, 2015, Sarajevo, Bosnia and Herzegovina

DOI: 10.1615/ICHMT.2015.THMT-15


ISBN Print: 978-1-56700-427-4

ISBN CD: 978-1-56700-428-8

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

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

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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