Random Excitation Forces in Tube Bundles Subjected to Two-Phase Cross-Flow

[+] Author and Article Information
C. E. Taylor, M. J. Pettigrew

AECL Research, Chalk River Laboratories, Chalk River, Ontario, Canada KOJ 1J0

I. G. Currie

Department of Mechanical Engineering, University of Toronto, Toronto, Ontario, Canada M5S 1A4

J. Pressure Vessel Technol 118(3), 265-277 (Aug 01, 1996) (13 pages) doi:10.1115/1.2842189 History: Received June 03, 1994; Revised August 17, 1995; Online February 11, 2008


Data from two experimental programs have been analyzed to determine the characteristics of the random excitation forces associated with two-phase cross-flow in tube bundles. Large-scale air-water flow loops in France and Canada were used to generate the data. Tests were carried out on cantilevered, clamped-pinned, and clamped-clamped tubes in normal-square, parallel-triangular, and normal-triangular configurations. Either strain gages or force transducers were used to measure the vibration response of a centrally located tube as the tube array was subjected to a wide range of void fractions and flow rates. Power spectra were analyzed to determine the effect of parameters such as tube diameter, frequency, flow rate, void fraction, and flow regime on the random excitation forces. Normalized expressions for the excitation force power spectra were found to be flow-regime dependent. In the churn flow regime, flow rate and void fraction had very little effect on the magnitude of the excitation forces. In the bubble-plug flow regime, the excitation forces increased rapidly with flow rate and void fraction.

Copyright © 1996 by The American Society of Mechanical Engineers
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