Abstract
Abstract 
 All central air conditioning systems contain piping system with various components, sizes, material, and layouts. If such systems in operating mode, the flow in piping system and its component such as valves can produce severe vibration due to some flow phenomenon’s. In this research, experimental measurements and numerical simulation are used to study the flow-induced vibration in valves. Computational fluid dynamics (CFD) concepts are included with one-way and two-way fluid-structure interaction concepts by using finite element software Package (ANSYS 14.57). Detection analysis is performed on flow characteristics under operation conditions and relations with structural vibration. Most of real geometrical, operational, and boundary conditions are simulated to obtain best similarity with real operation conditions. Comparisons performed between experimental data and numerical results (one-way and two-way simulation) to verify the results. The main conclusion was drawn from the study that the dominant source of vibration for valve is the water pulsation in addition to amount of water hammering. In addition, the main source of water pulsation in globe valve is the vortex shedding and pressure difference between upstream and downstream of valve. The vibration amplitude was increased with increasing flow rate until to be maximum when the flow rate around 30% and then decreased until flow rate reaches to around 85% and then trends to be constant.
 Keywords: Flow-induced vibration, vortex shedding, pressure pulsation, valve, finite element, ANSYS, fast Fourier transform (FFT).
Highlights
The vibration in piping system and its component especially valves can occurs due to many reasons
It mainly consists of two important regions: flow domain which the space occupied by fluid and contains all flow phenomenon's which the main cause of dynamic fluid forces and the pipe wall which represents the structure domain whose vibration is to be measured
The first observation on the vibration data is that the behavior of experimental measured vibration signal is close to that obtained from 1-way numerical simulation than that obtained from 2way numerical simulation
Summary
The vibration in piping system and its component especially valves can occurs due to many reasons. Some of these reasons related to unavoidable flow phenomenon such as turbulence, cavitation, vortex shedding, and pressure pulsation. The valve is one of the main components of any piping system. The study included design and analysis of motor operated flow control used for nuclear application. Al- Amayreh et al [4] presented a research on butterfly valve for vibration reduction. The work included numerical simulation of a butterfly valve used to control the flow rate in industrial process. Present research includes experimental and numerical investigation on flow-induced vibration in globe valve
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