An Experimental Investigation Into the Breakdown of Low Reynolds Number Pulsed Flows at a Pipe Orifice

[+] Author and Article Information
P. S. Addison

Department of Civil and Transportation Engineering, Napier University, Merchiston Campus, Edinburgh, Scotland

D. A. Ervine, A. H. C. Chan, K. J. Williams

Department of Civil Engineering, The Rankine Building, Glasgow University, Glasgow, Scotland

J. Fluids Eng 119(2), 347-353 (Jun 01, 1997) (7 pages) doi:10.1115/1.2819140 History: Received June 11, 1995; Revised February 11, 1997; Online December 04, 2007


An experimental investigation into the behavior of pulsed vortex flows in water at a pipe orifice is outlined. An experimental apparatus is described whereby flow pulsations are generated using an electronically controlled motor-piston arrangement. Preliminary investigations are made into the unpulsed system to determine the natural vortex shedding frequency for various Reynolds numbers and orifice diameters. The downstream development of initially axisymmetric, periodically pulsed vortices shed from the orifice plate are then examined. The growth, evolution, and eventual breakdown of the initially axisymmetric vortices are investigated for a range of flow control parameters. Various flow regimes are discerned and an attempt is made to categorize them.

Copyright © 1997 by The American Society of Mechanical Engineers
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