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Research Papers: Fundamental Issues and Canonical Flows

Flow Past a Rotating Cylinder at Low and High Rotation Rates

[+] Author and Article Information
S. Kumar1

Department of Engineering,  The University of Texas, Brownsville, TX 78520 sanjay.kumar@utb.edu

C. Cantu

Department of Engineering,  The University of Texas, Brownsville, TX 78520 cantu.ernesto@gmail.com

B. Gonzalez

Department of Engineering,  The University of Texas, Brownsville, TX 78520 beno85us@ymail.com

1

Corresponding author.

J. Fluids Eng 133(4), 041201 (May 16, 2011) (9 pages) doi:10.1115/1.4003984 History: Received September 08, 2010; Revised April 03, 2011; Published May 16, 2011

Flow past a rotating circular cylinder is studied experimentally. The experiments are carried out in a water tunnel at Reynolds numbers of 200, 300, and 400 and nondimensional rotation rates (ratio of surface speed of the cylinder to the free stream velocity), α, varying from 0 to 5. The diagnostic is done by flow visualization using hydrogen bubble technique and quantitative measurements using a particle image velocimetry technique. We present the global view of the wake structure at the three Reynolds numbers and various rotation rates. Vortex shedding activity is observed to occur from α=0 to α~1.95, after which it is suppressed. Reynolds number is found to have a strong effect on the wake morphology near the suppression rotation rate, α=1.95. Interestingly, the vortex shedding activity again resumes in the range 4.34<α<4.70 as first discovered numerically (Mittal and Kumar, 2003, “Flow past a rotating cylinder,” J. Fluid Mech., 476 , 303) for Re = 200. The shed vortices are of one sign in this range of rotation rates. Experimental evidence of this new vortex shedding mode is presented, for the first time, at α=4.45 in the newly discovered window of rotation rates, using flow visualization and particle image velocimetry measurements. Strouhal number measurements and global wake patterns agree well with the computations of Mittal and Kumar at a Reynolds number of 200.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 5

Flow visualization data at Re=400 and various clockwise rotation rates, α

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Figure 4

Flow visualization data at Re=300 and various clockwise rotation rates, α

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Figure 3

Flow visualization data at Re=200 and various clockwise rotation rates, α

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Figure 2

Schematic of the experimental setup for flow visualization and PIV experiments. (a) Top view; (b) side view. Platinum wire and graphite anode were absent for PIV studies.

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Figure 1

Schematic of the problem

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Figure 6

Instantaneous PIV measurements of nondimensional spanwise vorticity distribution, ωzD/U∞, at Re = 200 and various clockwise rotation rates showing vortex shedding suppression. Solid lines represent positive (counterclockwise) vorticity.

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Figure 7

Instantaneous PIV measurements of nondimensional spanwise vorticity distribution, ωzD/U∞, at Re=200 and α=4.45 showing the motion of single sign shed vortex. Dashed lines represent negative (clockwise) vorticity.

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Figure 8

Strouhal number, St, dependence on rotation rate, α

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