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Article

Fluidelastic Instability and Work-Rate Measurements of Steam-Generator U-Tubes in Air–Water Cross-Flow

[+] Author and Article Information
V. P. Janzen, E. G. Hagberg, M. J. Pettigrew, C. E. Taylor

Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, Ontario, K0J 1J0, Canada

J. Pressure Vessel Technol 127(1), 84-91 (Mar 15, 2005) (8 pages) doi:10.1115/1.1849229 History: Received August 20, 2002; Revised July 08, 2004; Online March 15, 2005
Copyright © 2005 by ASME
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References

Figures

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Diagram of the U-bend test section
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Tube bundle and instrumentation layout
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Lowest vibration modes for an unsupported U-tube (after Boucher and Taylor 11)
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Out-of-plane U-tube frequency-response spectrum for 90% void fraction, at a pitch velocity of 8.7 m/s, with a 1.5-mm tube-to-support clearance. Peaks corresponding to the lowest vibration modes are labeled (/Sup≡tube supported at apex).
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Out-of-plane vibration response spectra as a function of mass flux for liquid flow and a 0.75-mm tube-to-support clearance. Note the mode switch at ∼1750 kg/m2  s mass flux (Vp∼1.7 m/s).
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The rms vibration amplitudes for the lowest out-of-plane and in-plane (tangential) vibration modes
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Out-of-plane vibration amplitudes measured by strain gauges, in liquid flow
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In-plane tangential vibration amplitudes in liquid flow, measured by strain gauges
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In-plane-tangential vibration frequency-response spectra in liquid flow at pitch velocities of 1.08 m/s and 1.30 m/s
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Measured contact time of tube-to-support impacts for zero to 90% void fraction, with 0.75-mm tube-to-support clearance
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Measured total in-plane sliding distance during tube-to-support impacts for zero to 90% void fraction, with 0.75-mm tube-to-support clearance
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Measured force of tube-to-support impacts for zero to 90% void fraction, with 0.75-mm tube-to-support clearance
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Measured total work-rate during tube-to-support impacts for zero to 90% void fraction, with 0.75-mm tube-to-support clearance
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Measured total work-rate during tube-to-support impacts for zero to 90% void fraction, with 1.5-mm tube-to-support clearance

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