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An Analytical Model for Boundary Layer Attenuation of Acoustic Modes in Rigid Circular Ducts With Uniform Flow

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An analytical model is derived for the attenuation of fundamental and higher-order (both axisymmetric and non-axisymmetric) acoustic modes caused by viscothermal losses in the acoustic boundary layer. Flow convection effects are included in the modeling by assuming a uniform mean axial velocity profile. The proposed model can be applied to calculate the damping of the acoustic waves propagating in wide circular flow ducts with rigid walls. A simple and effective way of including the mean flow convection in the modeling for the attenuation of the fundamental mode is also suggested.
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Document Type: Short Communication

Publication date: November 1, 2016

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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