Time Resolved Torque of Three-Dimensional Rotating Bluff Bodies in a Cylindrical Tank

[+] Author and Article Information
D. Maynes

Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602

J. Klewicki, P. McMurtry

Department of Mechanical Engineering, University of Utah, SLC, UT 84112

J. Fluids Eng 120(1), 23-28 (Mar 01, 1998) (6 pages) doi:10.1115/1.2819656 History: Received November 05, 1996; Revised October 15, 1997; Online December 04, 2007


Torque measurements have been made on rotating three-dimensional bluff bodies in a cylindrical container from start-up to mean flow steady state. The flow is observed to pass through three distinct temporal regimes in the transient process. These regimes include a build-up period where the torque remains approximately constant, a decay period where the torque decreases, and a mean steady state where the mean torque remains at a constant level. Effects of body geometry, rotation rate, acceleration rate, and fluid height in the tank are quantified. The torque coefficient during the build-up and mean steady-state regimes is shown to be a function of Reynolds number and body geometry. A time scale marking the beginning of the decay period is presented in terms of the problem parameters. Over the range of parameters studied, the build-up, decay, and mean steady-state regimes are completely specified by the Reynolds number, geometric parameters, and decay time scale.

Copyright © 1998 by The American Society of Mechanical Engineers
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