The results of a series of tests describing the vibration behavior of several rotated triangular tube bundles subjected to two-phase cross flows are presented. Tube bundles with a pitch-to-diameter ratio of approximately 1.5 were tested over a broad range of void fractions and mass fluxes. Fluidelastic instability, random turbulence excitation, hydrodynamic mass, two-phase damping and local void-fraction were investigated. Well-defined fluidelastic instabilities were observed in continuous two-phase flow regimes. However, intermittent two-phase flow regimes had a dramatic effect on fluidelastic instability leading to lower than expected threshold flow velocities for instability. This effect was more pronounced in Freon two-phase flow than in air-water, and appeared well correlated to the transition between continuous and intermittent flow regimes. Generally, random turbulence excitation forces were much lower in Freon than in air-water. Although very dependent on void fraction, as expected, damping was quite similar in air-water and Freon.
Vibration Behavior of Rotated Triangular Tube Bundles in Two-Phase Cross Flows
Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference, Atlanta, Georgia, July 22–26, 2001, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, June 18, 2001; revised manuscript received November 2, 2001. Editor: S. Y. Zamrik.
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Pettigrew, M. J., Taylor , C. E., Janzen , V. P., and Whan , T. (May 1, 2002). "Vibration Behavior of Rotated Triangular Tube Bundles in Two-Phase Cross Flows ." ASME. J. Pressure Vessel Technol. May 2002; 124(2): 144–153. https://doi.org/10.1115/1.1462045
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