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RESEARCH PAPERS

Application of V Shape Riblets to Pipe Flows

[+] Author and Article Information
Shin-ichi Nakao

Fluid Measurement Section, National Research Laboratory of Metrology, Ibaraki, Japan

J. Fluids Eng 113(4), 587-590 (Dec 01, 1991) (4 pages) doi:10.1115/1.2926519 History: Received January 03, 1991; Online May 23, 2008

Abstract

Pipes with V shape riblets were tested at Reynolds numbers between 5×103 and 4×104 . All riblet pipes indicated some drag reduction. The model with h = 0.55 mm and h/S = 0.483 showed the maximum drag reduction of 8 percent and the widest range of Reynolds number over which the riblet reduces drag. The riblet shape desirable for drag reduction in pipe flows was almost the same as that in flat plate boundary layers, but the value of S+ which provided the maximum drag reduction was quite different; S+ = 23 for pipe flows and S+ = 12 for flat plate boundary layers.

Copyright © 1991 by The American Society of Mechanical Engineers
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