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TECHNICAL PAPERS: Heat Transfer Enhancement

Synchronization of Vortex Shedding and Heat Transfer Enhancement Over a Heated Cylinder Oscillating With Small Amplitude in Streamwise Direction

[+] Author and Article Information
C. Gau, S. X. Wu, H. S. Su

Institute of Aeronautics and Astronautics, National Cheng Kung University, Taiwan, R.O.C

J. Heat Transfer 123(6), 1139-1148 (Nov 03, 2000) (10 pages) doi:10.1115/1.1404121 History: Received March 27, 2000; Revised November 03, 2000
Copyright © 2001 by ASME
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References

Gau,  C., Wu,  J. M., and Liang,  C. Y., 1999, “Heat Transfer Enhancement and Vortex Flow Structure over a Heated Cylinder Oscillating in Cross-Flow Direction,” ASME J. Heat Trasfer , 121, No. 4, pp. 789–795.
Griffin,  O. M., and Ramberg,  S. E., 1976, “Vortex Shedding from a Cylinder Vibrating in Line With an Incident Uniform Flow,” J. Fluid Mech., 75, pp. 257–271.
Ongoren,  A., and Rockwell,  D., 1988, “Flow Structure form an Oscillating Cylinder, Part 2. Mode Competition in the Near Wake,” J. Fluid Mech., 191, pp. 225–245.
Kline,  S. J., and McClintock,  F. A., 1953, “Describing Uncertainties in Single-Sample Experiments,” Mech. Eng. (Am. Soc. Mech. Eng.), 75, pp. 3–12.
Coleman, H. W., and Steele, W. G. 1999, Experimentation and Uncertainty Analysis for Engineers, Wiley, New York.
Roshko, A., 1954, “On the Drag and Shedding Frequency of Two-Dimensional Bluff Bodies,” NACA Technical Note, p. 3169.
Zdravkovich,  M. M., 1982, “Modulation of Vortex Shedding in the Synchronization Range,” ASME J. Fluids Eng., 104, pp. 513–517.
Wu, S. X., 1998, “Vortex Formation Process and Heat Transfer over a Heated Cylinder Oscillating in the Streamwise Direction of the Flow,” M. S. thesis, National Cheng Kung University, Tainan, Taiwan, ROC.
Takahashi,  K., and Endoh,  K., 1990, “A New Correlation Method for the Effect of Vibration on Forced Convection Heat Transfer,” J. Chem. Eng. Jpn., 23, No. 1, pp. 45–55.

Figures

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Schematic diagram of the experimental setup: (a) A, wall of the wind tunnel, B, aluminum frame, C, stainless steel foil, D, thermocouples, E, camera; and (b) A, oil pan, B, electric resistance wire, C, cylinder, D, aluminum frame, E, electric step motor, F, rotating cam, G, Pitot tube, H, thermocouple wires, and I, connecting rod.
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Vortex structure when antisymmetric mode occurs at t/Te=0.33 and 0.66 for Re=1600, A/D=0.048 and (a) Fe/Fn=0, (b) Fe/Fn=2, (c) Fe/Fn=1, (d) Fe/Fn=0.5, and (eFe/Fn=1.5
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Phase of vortex shedding (circles and dots) relative to phase of cylinder displacement (sin curve, A/D can be 0.048, 0.032, and 0.016) as function of time for (a) Fe/Fn=0, (b) Fe/Fn=2, (c) Fe/Fn=1, (d) Fe/Fn=3, (e) Fe/Fn=0.5, (f) Fe/Fn=1.5, and (g) Fe/Fn=2.5
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Vortex structure when symmetric mode occurs with Re=1600, A/D=0.048 and (a) Fe/Fn=1, (b) Fe/Fn=3, and (c) Fe/Fn=2.5(V1, V2, and V3 represent the vortex No. 1, vortex No. 2 and vortex No. 3, respectively
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The Nusselt number distributions around the cylinder at different excitation frequencies for Re=1600, A/D=0.048
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The Nusselt number distributions around the cylinder at different excitation frequencies for A/D=0.048 and (a) Re=1900 and (b) Re=3200
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The Nusselt number distributions around the cylinder at different excitation frequencies for Re=1600 and (a) A/D=0.032 and (b) A/D=0.016
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The stagnation point Nusselt number for cylinder excitation at different frequencies and amplitudes with (a) Re=3200, (b) Re=1900, and (c) Re=1600
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The average Nusselt number for cylinder excitation at different frequencies and amplitudes with (a) Re=3200, (b) Re=1900, and (c) Re=1600

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