0
RESEARCH PAPERS

Vibration Excitation Forces Due to Two-Phase Flow in Piping Elements

[+] Author and Article Information
J.-L. Riverin

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), 7-13 (Mar 28, 2006) (7 pages) doi:10.1115/1.2388994 History: Received September 22, 2005; Revised March 28, 2006

Severe vibrations were observed in a small piping system comprising two elbows and straight sections configured in the form of a U and subjected to air-water internal two-phase flow. An experimental study was undertaken to investigate the governing vibration excitation mechanism. Vibration response, excitation forces, and fluctuating properties of two-phase flow were measured over a wide range of flow conditions. The results show that the observed vibrations are due to a resonance phenomenon between periodic momentum flux fluctuations of two-phase flow and the first modes of the piping system. The excitation forces consist of a combination of narrow-band and periodic components, with a predominant frequency that increases proportionally to flow velocity. For a given void fraction, the force spectra for various flow velocities and elbow geometries show little scatter on a plot of a normalized power spectral density as a function of a dimensionless frequency. The predominant frequencies of excitation agree with recent results on the characteristics of periodic structures in two-phase flow.

Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 2

Flow patterns corresponding to conditions of Table 2, from (8)

Grahic Jump Location
Figure 12

Bubble size distribution

Grahic Jump Location
Figure 13

Passage frequency spectrum of larger bubbles

Grahic Jump Location
Figure 14

Effect of void fraction on excitation forces (tube E)

Grahic Jump Location
Figure 15

Effect of flow pattern on force (tube A)

Grahic Jump Location
Figure 16

Experimental correlation for prediction of normalized force PSDs

Grahic Jump Location
Figure 17

Vibration prediction

Grahic Jump Location
Figure 18

Strouhal number versus quality (13)

Grahic Jump Location
Figure 3

Elbow geometry of all tubes

Grahic Jump Location
Figure 4

Position of force transducer

Grahic Jump Location
Figure 5

Position of the optical probe

Grahic Jump Location
Figure 6

Response spectra for tube B

Grahic Jump Location
Figure 7

Typical force traces for tube E

Grahic Jump Location
Figure 8

Rms value of forces versus two-phase flow velocity for all tubes

Grahic Jump Location
Figure 9

Typical force spectra for tube E

Grahic Jump Location
Figure 10

Predominant frequency versus two-phase flow velocity for all tubes

Grahic Jump Location
Figure 11

Normalized PSD of force versus dimensionless frequency for all tubes

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In