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RESEARCH PAPERS

Vibration Excitation Force Measurements in a Rotated Triangular Tube Bundle Subjected to Two-Phase Cross Flow

[+] Author and Article Information
C. Zhang, N. W. Mureithi

BWC/AECL/NSERC Chair of Fluid-Structure Interaction, Department of Mechanical Engineering, École Polytechnique, Montréal, QC, Canada, H3C 3A7

M. J. Pettigrew

BWC/AECL/NSERC Chair of Fluid-Structure Interaction, Department of Mechanical Engineering, École Polytechnique, Montréal, QC, Canada, H3C 3A7michel.pettigrew@polymtl.ca

J. Pressure Vessel Technol 129(1), 21-27 (Mar 31, 2006) (7 pages) doi:10.1115/1.2388996 History: Received September 22, 2005; Revised March 31, 2006

Two-phase cross flow exists in many shell-and-tube heat exchangers. Flow-induced vibration excitation forces can cause tube motion that will result in long-term fretting-wear or fatigue. Detailed vibration excitation force measurements in tube bundles subjected to two-phase cross flow are required to understand the underlying vibration excitation mechanisms. An experimental program was undertaken with a rotated-triangular array of cylinders subjected to air/water flow to simulate two-phase mixtures over a broad range of void fraction and mass fluxes. Both the dynamic lift and drag forces were measured with strain gage instrumented cylinders. The experiments revealed somewhat unexpected but significant quasi-periodic forces in both the drag and lift directions. The periodic forces appeared well correlated along the cylinder with the drag force somewhat better correlated than the lift forces. The periodic forces are also dependent on the position of the cylinder within the bundle.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 3

Typical dynamic force spectra for the interior cylinder at 80% void fraction: (a) lift force spectra and (b) drag force spectra

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Figure 4

Relationship between periodic force frequency and pitch velocity

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Figure 5

Relationship between rms periodic force and pitch velocity

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Figure 6

Typical dynamic force spectra for the left interior half-length cylinder at 80% void fraction: (a) lift force spectra and (b) drag force spectra

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Figure 7

Typical dynamic force spectra for the right interior half-length cylinder at 80% void fraction: (a) lift force spectra and (b) drag force spectra

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Figure 8

Comparison of force spectra for 80% void fraction at 5m∕s pitch flow velocity: (a) lift force spectra and (b) drag force spectra

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Figure 9

Comparison of force spectra for 80% void fraction at 10m∕s pitch flow velocity: (a) lift force spectra and (b) drag force spectra

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Figure 10

Coherences of the two half-length cylinders for 80% void fraction (a) at 5m∕s pitch flow velocity and (b) at 10m∕s pitch flow velocity

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Figure 11

Typical dynamic force spectra for the upstream cylinder at 80% void fraction: (a) lift force spectra and (b) drag force spectra

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Figure 12

Typical dynamic force spectra for the downstream cylinder at 80% void fraction: (a) lift force spectra and (b) drag force spectra

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Figure 13

Comparison of lift spectra along the flow path for 80% void fraction (a) at 5m∕s pitch velocity and (b) at 10m∕s pitch velocity

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Figure 14

Comparison of drag spectra along the flow path for 80% void fraction (a) at 5m∕s pitch velocity and (b) at 10m∕s pitch velocity

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Figure 15

Typical dynamic force spectra for the single cylinder at 80% void fraction: (a) lift force spectra and (b) drag force spectra

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Figure 16

The relationship between the Lockhart-Martinelli parameter and the Strouhal number (from Ref. 14)

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