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RESEARCH PAPERS

Turbulent Boundary Layers in Low Reynolds Number Shallow Open Channel Flows

[+] Author and Article Information
Ram Balachandar, Shyam S. Ramachandran

University of Saskatchewan, 57 Campus Drive, Saskatoon, Canada, S7N 5A9

J. Fluids Eng 121(3), 684-689 (Sep 01, 1999) (6 pages) doi:10.1115/1.2823524 History: Received April 28, 1998; Revised April 19, 1999; Online December 04, 2007

Abstract

The results of an experimental investigation of turbulent boundary layers in shallow open channel flows at low Reynolds numbers are presented. The study was aimed at extending the database toward lower values of Reynolds number. The data presented are primarily concerned with the longitudinal mean velocity, turbulent-velocity fluctuations, boundary layer shape parameter and skin friction coefficient for Reynolds numbers based on the momentum thickness (Reθ ) ranging from 180 to 480. In this range, the results of the present investigation in shallow open channel flows indicate a lack of dependence of the von Karman constant κ on Reynolds number. The extent to which the mean velocity data overlaps with the log-law decreases with decreasing Reθ . The variation of the strength of the wake with Reθ is different from the trend proposed earlier by Coles.

Copyright © 1999 by The American Society of Mechanical Engineers
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