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RESEARCH PAPERS

An Experimental Study of Pulsatile Pipe Flow in the Transition Range

[+] Author and Article Information
S. Einav, M. Sokolov

Tel-Aviv University, Tel-Aviv 69978, Israel

J Biomech Eng 115(4A), 404-411 (Nov 01, 1993) (8 pages) doi:10.1115/1.2895504 History: Received June 25, 1991; Revised November 04, 1992; Online March 17, 2008

Abstract

The study of pulsatile flows is relevant to many areas of applications. Typical applications include aerodynamics, biofluid mechanics, wind flows, and gas transport. Transition to turbulence during pulsatile flow is physiologically and clinically important. It has been suggested as a possible mechanism to enhance the transport of gases during high-frequency ventilation, may be related to valvular regurgitation and heart murmurs and to post stenotic dilatation and aneurysms. Measurements in a pulsatile pipe flow with a superimposed mean flow are reported. Data were taken in a water flow with mean Reynolds numbers in the range of 0 < Rem < 3000, oscillating Reynolds numbers of 0 < Reω < 4000, and Stokes parameter 7 < λ < 15. Velocity profiles of various phases of the flow, condition for flow reversal, and pressure losses were measured. The adequacy of a quasi-steady-state model is discussed. Condition for transition is determined by visually inspecting velocity signals at the centerline.

Copyright © 1993 by The American Society of Mechanical Engineers
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