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.
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e-mail: michel.pettigrew@polymtl.ca
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February 2007
Research Papers
Vibration Excitation Forces Due to Two-Phase Flow in Piping Elements
J.-L. Riverin,
J.-L. Riverin
BWC∕AECL∕NSERC Chair of Fluid-Structure Interaction, Department of Mechanical Engineering,
École Polytechnique Montréal
, QC, Canada, H3C 3A7
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M. J. Pettigrew
M. J. Pettigrew
Fellow ASME
BWC∕AECL∕NSERC Chair of Fluid-Structure Interaction, Department of Mechanical Engineering,
e-mail: michel.pettigrew@polymtl.ca
École Polytechnique Montréal
, QC, Canada, H3C 3A7
Search for other works by this author on:
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
Fellow ASME
BWC∕AECL∕NSERC Chair of Fluid-Structure Interaction, Department of Mechanical Engineering,
École Polytechnique Montréal
, QC, Canada, H3C 3A7e-mail: michel.pettigrew@polymtl.ca
J. Pressure Vessel Technol. Feb 2007, 129(1): 7-13 (7 pages)
Published Online: March 28, 2006
Article history
Received:
September 22, 2005
Revised:
March 28, 2006
Citation
Riverin, J., and Pettigrew, M. J. (March 28, 2006). "Vibration Excitation Forces Due to Two-Phase Flow in Piping Elements." ASME. J. Pressure Vessel Technol. February 2007; 129(1): 7–13. https://doi.org/10.1115/1.2388994
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