Flow-induced vibration of tube bundles considering the effect of periodic fluid force in a rotated triangular tube array.

• An experimental study was performed to obtain the flow-induced vibration of tube bundles. • A mathematical model was presented to study the flow-induced vibration of the tube. • The CFD calculations were carried out to obtain the periodic fluid force acting on the tube. • The effect of the periodic force on the vibration responses of the tube was discussed. This paper investigated the flow-induced vibration of the tube bundles considering the effect of periodic fluid force in a rotated triangular tube array. We first performed an experiment to obtain the vibration responses of a rotated triangular tube array with the pitch-to-diameter ratio P / D = 1.48. To further investigate the vibration characteristics of the tube bundles, a mathematical model of the tube bundles considering the effect of the periodic fluid force and the clearance restriction was developed. Based on the Computational Fluid Dynamics calculation, the fluid force coefficients and the Strouhal numbers of the periodic fluid force in the tube bundles were determined. Considering the effect of the periodic fluid force, the vibration responses of the tube bundles were calculated. The vibration characteristics of the tube bundles induced by the periodic fluid force were discussed. The results demonstrated that some complex vibrations such as the beat vibrations and resonance may be induced by the periodic fluid force in the rotated triangular tube array, and the frequency of the periodic fluid force has a significant influence on the vibration characteristics of the tube bundles before the fluidelastic instability. [ABSTRACT FROM AUTHOR]