Vibration of Tube Arrays Induced by Two Phase Normal Flow

Abstract

There are many problems of the vibration of tube arrays induced by the gas and liquid two-phase normal flow compared to a single phase flow. Until now, it was unclear whether the main feature of the vibration was random or self-excited. In this study, the following two kinds of experimentt were performed. First, the induced vibrations of three rows of tube arrays in the two-phase flow were measured. Second, the tube arrays in the two-phase flow were vibrated using a link mechanism and the resultant unsteady hydraulic forces generated on the tube were measured. As a result, it became clear that the vibration is induced by self excitation and the unstable region spread by increasing the void ratio.