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Research Papers: Technical Forum

An Experimental Study of Flow-Induced Vibration and the Associated Flow Perturbations in a Parallel Triangular Tube Array

[+] Author and Article Information
Ahmed Khalifa

e-mail: khalifam@mcmaster.ca

Samir Ziada

Mechanical Engineering Department,
McMaster University,
Hamilton, ON, L8S 4L7 Canada

1Corresponding author.

2Present address: Atomic Energy Canada Limited, Chalk River, Ontario, Canada.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Mechanical Design. Manuscript received May 24, 2012; final manuscript received November 21, 2012; published online May 21, 2013. Assoc. Editor: Njuki W. Mureithi.

J. Pressure Vessel Technol 135(3), 030904 (May 21, 2013) (9 pages) Paper No: PVT-12-1070; doi: 10.1115/1.4023427 History: Received May 24, 2012; Revised November 21, 2012

The results of an experimental investigation of the flow perturbations associated with tube vibrations along the interstitial flow path are presented. A parallel triangular tube array consisting of seven rows and six columns of aluminum tubes with a pitch ratio of 1.54 was studied. Measurements of the interstitial flow perturbations along the flow lane were recorded using a hot-wire anemometer while monitoring the tube vibration in the longitudinal and transverse directions. A single flexible tube located in the third row of a rigid array was instrumented with pressure transducers to monitor the surface pressure variations. The flow perturbation amplitude and phase with respect to the tube vibrations were obtained at a number of locations along the flow lane in the array. The effects of tube vibration amplitude and frequency, turbulence level, location of measurements, and mean gap velocity on the flow perturbation amplitude and relative phase were investigated. It is found that the flow perturbations are most pronounced at the point of flow separation from the tube and decay rapidly with distance from this point. It appears that the time delay between tube vibration and flow perturbation is associated with flow separation and vorticity generation from the vibrating tube.

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Figures

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Fig. 1

Tube array configuration, instrumentation, and locations of hot-wire measurements along an assumed flow channel

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Fig. 2

Sketch of the tube support arrangement

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Fig. 3

Flow in a parallel triangular tube array, Pr = 1.375, Re = 85 [19]

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Fig. 4

Tube (1) response as a single flexible tube in a rigid array

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Fig. 5

Interstitial flow velocity at point H, tube vibration amplitude 1%D

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Fig. 6

Flow velocity perturbation amplitude along flow channel and near the tubes

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Fig. 9

Variation of mean gap velocity with tube natural frequency to obtain constant vibration amplitude

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Fig. 8

Effect of turbulence level on the coherence between tube vibrations and flow perturbations signal

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Fig. 7

Scaled flow velocity perturbation amplitude along the middle of a flow channel

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Fig. 11

Effect of tube frequency on normalized time τUg/D at point (D), tube vibration amplitude 0.8%D

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Fig. 10

Phase lag between tube vibration and flow perturbation at point (D), tube vibration amplitude 0.8%D

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Fig. 12

Normalized time delay as a function of measurement location, f = 25 Hz, for various vibration amplitudes

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