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TECHNICAL PAPERS: Forced Convection

Experimental Study of Heat Convection From Stationary and Oscillating Circular Cylinder in Cross Flow

[+] Author and Article Information
H. G. Park

Jet Propulsion Laboratory, California Institute of Technology Pasadena, CA 91109

Morteza Gharib

Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125

J. Heat Transfer 123(1), 51-62 (May 17, 2000) (12 pages) doi:10.1115/1.1338137 History: Received January 03, 2000; Revised May 17, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematic of water tunnel facility
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Normalized surface heat transfer as function of oscillation frequency for A/D=0.1
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Normalized surface heat transfer as function of oscillation frequency for A/D=0.2
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Nusselt number versus length of the mean wake bubble (formation length)
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Stagnant and non-heat convecting fluid near the base of the cylinder for Case (I), and vortices scrubbing away fluid near the base of the cylinder for Case (II). Note the close roll-up of the vortex and large velocity near the base of the cylinder in Case (II) as compared to Case (I). Note: the contours are lines of constant vorticity.
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Nusselt number versus mean total vorticity flux of the lower shear layer at x/d=0.8
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Vorticity flux versus the length of the mean wake bubble
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Sequence of phase averaged vorticity fields for forced oscillating cylinder at Stc=0.58,A/D=0.1 (Case IV). (|〈ωz〉D/U|〉1.0, contour increment 0.5). See Fig. 13(D) for phase corresponding to each letter.
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PSD of uy at location of maximum uy fluctuations on the wake centerline for forced oscillating cylinder at Stc=0.34,A/D=0.1 (Case III)
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Sequence of phase averaged vorticity fields for forced oscillating cylinder at Stc=0.34,A/D=0.1 (Case III). (|〈ωz〉D/U|〉1.0, contour increment 0.5). The phase averaging is done with respect to the cylinder oscillation frequency in (A) and uy at location of maximum uy fluctuations on the wake centerline in (B). See Fig. 13(A) and (B) for phase corresponding to each letter.
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Sequence of phase averaged vorticity fields for forced oscillating cylinder at Stc=0.37,A/D=0.2 (Case VII) (A), and Stc=0.42,A/D=0.2 (Case VIII) (B). (|〈ωz〉D/U|〉1.0, contour increment 0.5). See Fig. 13(C) for phase corresponding to each letter.
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Reference velocity and displacement of the cylinder corresponding to each letter of phase average

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