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TECHNICAL BRIEFS

Rapid Transition to Turbulence in Pipe Flows Accelerated From Rest

[+] Author and Article Information
David Greenblatt, Edward A. Moss

University of the Witwatersrand, PO WITS 2050, South Africa

J. Fluids Eng 125(6), 1072-1075 (Jan 12, 2004) (4 pages) doi:10.1115/1.1624423 History: Received January 13, 2003; Revised June 23, 2003; Online January 12, 2004
Copyright © 2003 by ASME
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References

Figures

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LDV data acquired at y/a≈1.0 for (1) a simple acceleration from rest; and (2) acceleration from rest, followed by deceleration
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Velocity profiles during the acceleration phase (t<2 s), showing (a) flow development across the pipe radius, and (b) near-wall details of the boundary layer (caption on Fig. 2(b)).
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Near-wall velocity profiles during the deceleration phase (2 s<t<2.5 s)
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Velocity profiles subsequent to the deceleration phase (t>2.5 s)
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Velocity profiles averaged over 1 s time intervals subsequent to transition

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