Strouhal Number of Naturally-Oscillating Triangular and Circular Jets

Lee, S. K., Lanspeary, P. V. and Nathan, G. J. (2007). Strouhal Number of Naturally-Oscillating Triangular and Circular Jets. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, David Mee, Rose Clements, Richard Morgan and Charles Lemckert, 16th Australasian Fluid Mechanics Conference (AFMC). 16th Australasian Fluid Mechanics Conference (AFMC), Gold Coast, Queensland, Australia, (447-450). 3-7 December, 2007.

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Author Lee, S. K.
Lanspeary, P. V.
Nathan, G. J.
Title of paper Strouhal Number of Naturally-Oscillating Triangular and Circular Jets
Conference name 16th Australasian Fluid Mechanics Conference (AFMC)
Conference location Gold Coast, Queensland, Australia
Conference dates 3-7 December, 2007
Proceedings title 16th Australasian Fluid Mechanics Conference (AFMC)
Place of Publication Brisbane, Australia
Publisher School of Engineering, The University of Queensland
Publication Year 2007
Year available 2007
Sub-type Fully published paper
ISBN 978-1-864998-94-8
Editor Peter Jacobs
Tim McIntyre
Matthew Cleary
David Buttsworth
David Mee
Rose Clements
Richard Morgan
Charles Lemckert
Start page 447
End page 450
Total pages 4
Collection year 2007
Language eng
Abstract/Summary A nozzle consisting of an abrupt expansion into a short openended 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 theminimumpossible expansion ratio for a circular oscillating jet.
Subjects 290501 Mechanical Engineering
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

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Created: Wed, 19 Dec 2007, 11:10:08 EST by Laura McTaggart on behalf of School of Engineering