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TECHNICAL PAPERS

A Study of Vortex Shedding in a Staggered Tube Array for Steady and Pulsating Cross-Flow

[+] Author and Article Information
E. Konstantinidis, S. Balabani, M. Yianneskis

Department of Mechanical Engineering, King’s College London, Strand, London WC2R 2LS, United Kingdom

J. Fluids Eng 124(3), 737-746 (Aug 19, 2002) (10 pages) doi:10.1115/1.1487359 History: Received August 02, 2000; Revised April 02, 2002; Online August 19, 2002
Copyright © 2002 by ASME
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References

Figures

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Schematic cross-section of the tube array. The coordinate system employed is also shown and crosses indicate the measurement locations.
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Mean velocity profile with respect to a constant phase in the pulsation cycle obtained at the reference point upstream of the tube array
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Spectra of the streamwise velocity fluctuations for different gap velocities at the location: x/d=7.35,y/d=0.9 (steady flow). The Reynolds number is Re=104×Ug.
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Development of the streamwise velocity spectra along the flow lane between the staggered tubes for steady flow and Ug=0.53 ms−1(Re=5300)
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The variation of the amplitude of velocity fluctuations at the shedding frequency as a function of the location in the array and Reynolds number (steady flow); (a) fS1 component and (b) fS2 component
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Variation of the dominant frequency components detected in the array as a function of the gap velocity for steady flow
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Strouhal number, S, as a function of the reduced frequency of pulsation, SP. The size of the symbols is proportional to the value of the reduced amplitude, ε. (a) fS1, (b) fS2 and (c) fS3.
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The variation of fS/fN as a function of fP/fN for each frequency component and comparison with single cylinder results
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Development of the streamwise velocity spectra along the flow lane between the staggered tubes for pulsating flow Re=2500;SP=0.40;ε=0.08
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Limits of lock-on for a cylinder oscillating in-line with the flow (from Tanida et al. reported in 20), a stationary cylinder subjected to pulsating cross-flow (from Barbi et al. 20) and present experimental data. Each symbol represents an experimental set and the different symbols represent the different frequency components. Solid symbols indicate experiments for which lock-on occurred.
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The variation of the amplitude of the velocity fluctuations at the shedding frequency as a function of the reduced pulsation frequency. Results are normalized with the gap velocity and solid symbols indicate experiments for which lock-on occurred; (a) fS1 at x/d=2.1 (b) fS2 at x/d=6.4 and (c) fS3 at x/d=11.3 (y/d=0.9 in all cases).
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Visualization of the wake behind the first row tube for steady flow; Re=1400
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Vortex shedding patterns in the second row for steady flow; Re=1400
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Time sequence illustrating alternating vortex shedding in the first row for flow conditions for which the shedding frequency locked-on at the subharmonic of the pulsation frequency; Re=2300;SP=0.44;ε=0.04
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Root-mean-square of transverse velocity fluctuations measured along the centerline in the wake of the first row for different pulsating flow conditions

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