Flow Induced Vibration of Separated Two-Phase Flow Due to Restricting Orifice

Abstract

The current work investigates flow-induced vibrations of piping structures with flow restricting orifices due to separated two-phase flow. Air-water flow through a flow restricting orifice with area ratio of 0.25 was experimentally investigated at various superficial velocities ranging from JL from 0.46 m/s to 1.3 m/s and JG from 0.76 m/s to 1.7 m/s. The vibration response of the piping structure was captured for stratified-wavy and dispersed annular flow patterns. Also, the time signals of piping displacement and void fraction with the flow structure were analysed. The results show that Flow induced vibrations of piping structures with a flow restricting orifice due to separated two-phase flow due to flow restricting orifice is a strong function of the void fraction upstream of the orifice for stratified-wavy flow pattern. Moreover, the amplitude of vibration at frequency conditions in the neighbourhood of the dominant void fraction frequency reduced with the increase in the gas superficial velocity.