Frictional Drag Reduction by Injecting High-Viscosity Fluid Into Turbulent Boundary Layer

[+] Author and Article Information
H. Kato, Y. Fujii, H. Yamaguchi, M. Miyanaga

Department of Naval Architecture and Ocean Engineering, University of Tokyo, Bunkyo, Tokyo, 113, Japan

J. Fluids Eng 115(2), 206-212 (Jun 01, 1993) (7 pages) doi:10.1115/1.2910125 History: Received May 26, 1991; Revised July 18, 1992; Online May 23, 2008


This paper presents a new method to reduce turbulent frictional drag by injecting high-viscosity fluid into the boundary layer. When the turbulent region of the boundary layer is filled with high-viscosity fluid, and the viscosity of the viscous sublayer is kept low, the Reynolds stress in the turbulent region is reduced and therefore requires a greater velocity gradient to transfer the momentum. The greater velocity gradient in the turbulent region results in a reduction of the velocity gradient at the viscous sublayer, which causes a drop in shear stress at the wall. Such a boundary-layer structure could be created by injecting two different fluids from double slits on a wall. Sugar syrup and water were used as the high-viscosity fluid and the low-viscosity fluid, respectively. The shear stress was directly measured by shear stress pick-ups mounted flush on the wall. The shearing stress was reduced by more than 50 percent at the optimum injection condition. A water/water injection experiment was also performed to show the effect of injection itself.

Copyright © 1993 by The American Society of Mechanical Engineers
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