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Numerical Study of the Hydrodynamic Interaction Between Aerosol Particles Due to the Acoustic Wake Effect

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The problem of aggregation of two spherical particles subjected to an acoustic field is numerically examined in this paper for the Oseen regime. The study focuses on the hydrodynamic mechanism known as the acoustic wake effect (AWE), and its influence on the acoustic agglomeration processes. Two nearby spherical particles are considered, subjected to acoustic fields under Oseen flow conditions and characterized by Reynolds numbers smaller than unity. The main goal of this work is to spawn the range of applicability of a theoretical analysis carried out previously by the authors, which was not applicable in a strict sense at distances shorter than 3.5 times the particle diameter. At these short distances the acoustic wake effect becomes the most intense and that is why it is interesting. A system of differential equations describing the particle dynamics is numerically solved. Particle trajectories are simulated during the complete approach process up to collision without any spatial restrictions, as well as the particles' convergence velocity. A bidimensional description of the acoustic wake effect is performed in this numerical simulation. It reveals strong attraction between two interacting particles with their center-line oriented at angles from 0 ° to 45° with respect to the wave propagation direction. The results of this study are compared to those of the previous theoretical analysis. A good agreement between the two studies is found that evidences the applicability of the numerical treatment of the problem.
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Document Type: Research Article

Publication date: July 1, 2001

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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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