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|Title:||Strouhal number of naturally-oscillating triangular and circular jets|
|Citation:||Proceedings of the 16th Australasian Fluid Mechanics Conference / P. Jacobs, T. McIntyre, M. Cleary, D. Buttsworth, D. Mee, R. Clements, R. Morgan, C. Lemckert (eds.), 3-7 December 2007: pp.447-450.|
|Publisher:||University of Queensland|
|Conference Name:||Australasian Fluid Mechanics Conference (16th : 2007 : Gold Coast, Australia)|
|S. K. Lee, P. V. Lanspeary and G. J. Nathan|
|Abstract:||A nozzle consisting of an abrupt expansion into a short open- ended tube can produce a naturally-excited oscillating-jet flow. The characteristics of the oscillating jet depend on jet-orifice to chamber expansion ratio (D/d1), chamber length-to-diameter ratio (L/D), and shape of the jet orifice. In experiments using water as a flow medium, air-bubble visualisation and signals from a pressure transducer show that a triangular-jet orifice produces aperiodic oscillation without a spectral peak. In contrast, oscillation of the circular jet has clearly visible periodicity and the spectrum has a broad peak. The circular and triangular orifices produce completely different dependence of Strouhal number on expansion ratio. For a circular orifice, Strouhal number is inversely proportional to (D/d1−1). For a triangular orifice, Strouhal number is directly proportional to (D/d1−1). The two curves intersect at an expansion ratio of 4.8, which is approximately the minimum possible expansion ratio for a circular oscillating jet.|
|Rights:||Copyright status unknown|
|Appears in Collections:||Mechanical Engineering conference papers|
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