Flow in Turbulent Wall Layer Over Uniform Roughness

[+] Author and Article Information
Jin Wu

Hydronautics, Inc., Laurel, Md.

J. Appl. Mech 40(4), 863-867 (Dec 01, 1973) (5 pages) doi:10.1115/1.3423176 History: Received March 01, 1972; Revised November 01, 1972; Online July 12, 2010


A boundary-layer survey has been conducted on a rough plate consisting of uniform spherical particles arranged in a random and compact fashion. Strong turbulent mixing was observed in a region within a quarter of the particle size from the top of the particles. Such mixing is important to transfer or transport processes near a rough wall. The data of the normal axis of the present rough surface are found to be located at a distance of 1/50 of the particle diameter below the top of the particles. This reference data are different from that used by Nikuradse, indicating a possible modification of some numerical constants determined by Nikuradse.

Copyright © 1973 by ASME
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