Research Papers: Fluid-Structure Interaction

Vibration of a Normal Triangular Tube Bundle Subjected to Two-Phase Freon Cross Flow

[+] Author and Article Information
M. J. Pettigrew

BWC/AECL/NSERC Chair of Fluid-Structure Interaction, Ecole Polytechnique, Montreal, QC, H3C 3A7, Canada

C. E. Taylor

IMD Branch, Atomic Energy of Canada Ltd., Chalk River, ON, K0J 1J0, Canada

J. Pressure Vessel Technol 131(5), 051302 (Sep 02, 2009) (7 pages) doi:10.1115/1.3147985 History: Received July 24, 2008; Revised February 25, 2009; Published September 02, 2009

This paper presents the results of a test series to study the vibration behavior of a normal triangular tube bundle subjected to two-phase Freon cross flow. A normal triangular tube bundle of pitch over diameter ratio of 1.5 was tested over a broad range of void fractions and mass fluxes. Fluidelastic instabilities, random turbulence excitation, and damping were investigated. The results were compared with those obtained for a similar tube bundle tested in an air-water cross flow and to those for a rotated triangular bundle similarly tested in Freon.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Location of instrumented tubes in tube bundle (viewed from the tubesheet end)

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Figure 2

Typical vibration response spectra (70% void fraction and drag direction)

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Figure 3

Vibration response: flexible versus rigid tube bundle (80% void fraction)

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Figure 4

Vibration response for different tube locations within the tube bundle (80% void fraction)

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Figure 5

Hydrodynamic mass: comparison between air-water and Freon-22 results

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Figure 6

Effect of mass flux on tube damping in lift and drag directions

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Figure 7

Measured total damping ratio

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Figure 12

Vibration response of interior tube in flexible tube bundle at 50% void fraction: comparison Freon versus air-water results

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Figure 13

Power spectral density of random turbulence excitation forces at reduced frequency FdB/Up=0.1: comparison Freon-22 versus air-water (drag direction)

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Figure 14

McQuillan and Whalley flow regime map showing test conditions: (a) Freon-22 and (b) air-water

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Figure 8

Two-phase damping component: comparison of Freon-22 against air-water and steam-water data for normal triangular tube bundles

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Figure 9

Fluidelastic instability results in two-phase cross flow: Comparison Freon- 22 versus air-water

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Figure 10

Flow regime map for two-phase cross flow showing conditions at fluidelastic instability

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Figure 11

Fluidelastic instability results for continuous two-phase flows: comparison air-water, steam-water, and Freon-22




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