On Separation of a Divergent Flow at Moderate Reynolds Numbers

[+] Author and Article Information
Yuji Matsuzaki

National Aerospace Laboratory, Chofu, Tokyo, Japan

Yuan-Cheng Fung

Department of Applied Mechanics and Engineering Sciences, University of California, San Diego, La Jolla, Calif.

J. Appl. Mech 43(2), 227-231 (Jun 01, 1976) (5 pages) doi:10.1115/1.3423814 History: Received September 01, 1975; Revised December 01, 1975; Online July 12, 2010


Flow separation in a divergent channel was investigated in connection with problems of instability and oscillations in physiology at a Reynolds number range much smaller than that usually considered in engineering diffuser design. Experimental data on a divergent flow through a two-dimensional water tunnel in the Reynolds number range Re = 1000 to 6000 are presented. The quantities measured are flow rate, divergence angle, and mean pressure differential between two fixed points at the throat and downstream. In a lower range of divergence angle flow separation is characterized by a sharp decrease in the mean pressure differential when the flow rate is increased continuously and gradually; whereas recovery from separation is signaled by a discontinuous increase in pressure when the flow rate is decreased again. The critical Reynolds numbers for separation and reattachment are detectably different. Some discussion is given about flow separation in external and internal flows.

Copyright © 1976 by ASME
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