Generation of the Vorticity Mode by Sound in a Relaxing Maxwell Fluid
This study develops a new theory of nonlinear acoustics investigating interactions between acoustical and other non-acoustical modes, such as vorticity modes, in a fluid. The ideas proposed by the authors make possible to derive instantaneous equations describing interaction between different modes in a relaxing Maxwell fluid. The procedure of deriving of a new dynamic equation governing the vorticity mode which is generated by sound, is discussed in details. It uses only instantaneous quantities and does not include averaging over sound period. The resulting equation applies to both periodic and aperiodic sound of any waveform as the origin of the vorticity mode. The theory is illustrated by two representative examples of generation of the vorticity mode in a relaxing Maxwell fluid, caused by periodic sound beam and a sound beam with a stationary but aperiodic waveform.
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Document Type: Research Article
Publication date: September 1, 2010
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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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