Abstract
This paper investigates the fluidelastic instability of a rotated triangular tube array subjected to two-phase crossflow considering the effect of the slip ratio of air-phase and water phase. We first established a Computational Fluid Dynamics model to determine the two-phase flow parameters. Then, a dynamic model of the tube motion while considering the effect of the slip ratio of the air phase and the water phase was developed. The eigenvalue problem of fluidelastic instability of the tube bundles for five void fraction conditions was studied. The results indicate that the slip ratio of the air phase and water phase is an important factor to predict the threshold of fluidelastic instability of a rotated triangular tube array in the transverse direction. The critical velocities of fluidelastic instability of the tube bundles obtained from the separated flow model are much lower those obtained from the Homogeneous Equilibrium Model.
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