The influence of flow, geometry, wall thickness and material on acoustic wave resonance in water-filled piping
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Date
2012-08-19, 2013-11-14, 2016
Authors
Mokhtari, Alireza
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Abstract
The study of acoustic resonance in fluid-filled piping systems with and without mean flow is important for the nuclear industry. For this industry, it is vital to understand the acoustic resonance in their systems; however, no comprehensive experimental benchmark data or accurate modeling tool exists for predicting such a phenomenon. The main goals of the current research are to create a new experimental data bank for the conditions not tested earlier using the configurations of straight lines and branches, and to evaluate the applicability of the linear wave solution using different damping methods and a computational fluid dynamic (CFD) code to simulate the acoustic resonance in fluid-filled piping systems.
In this experimental study, data on resonant frequencies and resonant amplitudes are collected and analyzed for a frequency range of 20–500 Hz for straight and branched tubes by varying their wall thicknesses, materials, and branch configurations at different flow rates and outlet boundary conditions. To be closer to the nuclear industry medium, water is employed in our experiments, contrasting to the fact that most of the available experiments reported were with air at a much lower sonic velocity. I consider here, in particular, measurements at the end of closed branches, upstream, downstream, and at different locations of the main line, as well as the interactions of different sonic velocities along the main pipes. A small diameter is chosen for the branched experiments since the decrease in the width of the main line and the branches has a pronounced effect on the resonant amplitudes due to an increased interaction among the unsteady shear layers forming across the side branches. The experimental results show that there is a strong effect of turbulent flow, wall material, and wall thickness on resonant amplitudes at frequencies above ∼250 Hz.
Numerical investigations are performed solving the one-dimensional (1D) linear wave equation with constant and frequency-dependent damping terms and a CFD code. Employing frequency-dependent damping methodologies shows improvement in terms of resonant amplitude prediction over constant volumetric drag method. Comparing the 1D and CFD results shows that the CFD solution yields better predictions.
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Keywords
Resonant frequency, Resonant amplitude, Fluid-filled tube, The linear wave solution
Citation
Mokhtari A., Chatoorgoon V., 2012. "Study of Wall Thickness and Material Effect on Acoustic Wave Propagation in Water-Filled Piping ", Internoise /ASME NCAD Conference, August 19-22, New York City, NY, USA
Mokhtari A., Chatoorgoon V., 2013. "THE INFLUENCE OF GEOMETRY, WALL THICKNESS, AND MATERIAL ON THE ACOUSTIC RESONANCE PREDICTIONS IN CLOSED-ENDED WATER-FILLED PIPING",ASME International Mechanical Engineering Congress & Exposition, November 14-21, San Diego, California ,USA
Mokhtari A., Chatoorgoon V., 2016. “A Study of Acoustic Wave Resonance in Water-Filled Tubes with Different Wall Thicknesses and Materials” ASME J of Nuclear Rad Sci 2(3), 031011
Mokhtari A., Chatoorgoon V., 2013. "THE INFLUENCE OF GEOMETRY, WALL THICKNESS, AND MATERIAL ON THE ACOUSTIC RESONANCE PREDICTIONS IN CLOSED-ENDED WATER-FILLED PIPING",ASME International Mechanical Engineering Congress & Exposition, November 14-21, San Diego, California ,USA
Mokhtari A., Chatoorgoon V., 2016. “A Study of Acoustic Wave Resonance in Water-Filled Tubes with Different Wall Thicknesses and Materials” ASME J of Nuclear Rad Sci 2(3), 031011