Abstract
This paper reviews a vibration problem relating to industrial energy equipment such as steam generators, heat exchangers. and condensers. It focuses on unstable vibrations in circular cylindrical structures immersed in two-phase cross flows, which are caused by unsteady fluid forces induced by the interaction between structural vibration and the fluid flow. Added mass and fluid damping induced by a vibrating circular cylinder in a two-phase bubble fluid are introduced, and then the effects of air bubbles on vortex-induced vibrations such as in-line and cross-flow oscillations of a single circular cylinder are reviewed experimentally. Finally, fluidelastic vibrations in a single row of cylinders as well as in cylinder arrays are discussed in relatlon to air bubble effects on instability criteria with respect to reduced velocity and mass-damping parameters.
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