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Two-Phase Flow Induced Vibration in Complex Geometries

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Title: Two-Phase Flow Induced Vibration in Complex Geometries
Author: Bamidele, Olufemi
Department: School of Engineering
Program: Engineering
Advisor: Ahmed, WaelHasan, Marwan
Abstract: ABSTRACT TWO-PHASE FLOW INDUCED VIBRATION IN COMPLEX GEOMETRIES Olufemi Eyitope Bamidele Advisors: University of Guelph, 2019 Dr. Wael H. Ahmed Dr. Marwan Hassan Two-phase flow-induced vibration (FIV) has been a major concern in many industrial systems including tube bundles in steam generators, chemical mixers, and oil and gas pipelines. In these systems, when two-phase flows through complex geometries, such as elbows, tees, orifices and valves, it creates an undesirable level of vibrations in the piping structure. In many cases, the vibration can be large enough to cause piping failures. In this thesis, two-phase flow-induced vibration in piping structures with a U-bend and a flow restricting orifice were investigated. Experiments were carried out with air and water for wide range of operating conditions to investigate the effect of various flow patterns including bubbly, intermittent and separated flow on the vibration response of the structures. Also, the effects of void fraction, mass quality and geometry were investigated. The results provide a better understanding of the effect of void fraction and flow pattern change on the vibration response in complex geometries. The thesis introduced synchronized flow visualization along with the local void fraction and vibration signals, acquired through the use of state-of-the-art equipment to understand piping structure response. A mathematical model of the two-phase flow induced forces in a piping elbow was proposed and validated. Flow pattern maps were drawn as a part of this work to ensure better design and safe operation of systems suffering from two-phase flow-induced vibrations.
Date: 2019-11-03
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Embargoed Until: 2020-08-22

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