Heterogeneous Drag Reduction Concepts and Consequences

[+] Author and Article Information
Klaus W. Hoyer

Engineering Specialist, Eidetics Corporation, 3425 Lomita Blvd., Torrance, CA 90505

Albert Gyr

Institute of Hydromechanics and Water Resources Management, Swiss Federal Institute of Technology, Zurich, Switzerland

J. Fluids Eng 120(4), 818-823 (Dec 01, 1998) (6 pages) doi:10.1115/1.2820743 History: Received January 21, 1997; Revised June 15, 1998; Online December 04, 2007


This paper deals with the nature of the heterogeneous drag reduction which occurs in turbulent pipe flows when a concentrated polymer solution is injected into the pipe center. According to earlier concepts, the achieved drag reduction is due to a direct, large-scale interaction of the viscoelastic polymer thread with the turbulent flow field. The authors prove that the heterogeneous drag reduction originates exclusively from agglomerates of dissolved polymer molecules present in the flow.

Copyright © 1998 by The American Society of Mechanical Engineers
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