The Effect of Blade Manipulator in Fully Developed Pipe Flow

[+] Author and Article Information
Y. A. Mah, B. C. Khoo, Y. T. Chew

Department of Mechanical & Production Engineering, National University of Singapore, Kent Ridge, Singapore 0511

J. Fluids Eng 114(4), 687-689 (Dec 01, 1992) (3 pages) doi:10.1115/1.2910086 History: Received October 02, 1991; Online May 23, 2008


Experiments were carried out in applying the concept of passive device called BLADEs (boundary-layer alteration devices) to fully developed pipe flow to assess its feasibility as a drag reduction device. The results of both the volumetric flow rate measurement and the pipe wall pressure distribution taken far downstream show that there is a net increase in drag with the device. With BLADES in tandem arrangement, there is a further net increase in drag which is contrary to its counterpart in boundary layer flow. Although the wall shear stress measurement following the device indicates some reduction in local drag, its magnitude of reduction is much smaller than that seen in the equivalent boundary flow. All these results suggest little possibility of any useful application of BLADEs to pipe flow.

Copyright © 1992 by The American Society of Mechanical Engineers
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