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Induced Coagulation of small Particles under the Action of Sound

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A new interpretation is suggested for the acoustic coagulation of monoradius aerosols and suspensions on the basis of a model of collective particle interaction, taking into account not the forces of pair interaction but the forces induced by a whole ensemble of particles. The dependence of the coagulation time on the frequency and power of the acoustic field is explained by this model. The physical interpretation of the phenomenon is simple. In a region of increased particle density in the suspension, the effective cross-section for the carrier phase is decreased leading to an increase in the velocity of its flow relative to the particles. The velocity increase is accompanied by a pressure friction that results in a further increase in the density. As a result, the probability of particle collision is raised, and the coagulation process is accelerated. The effect is considered taking into account all the forces acting on the particle (Archimedes, Stokes, Basset). It is shown that the dependence of the coagulation time on the frequency has a resonance character. A comparison is made between the results obtained and experimental data. The dependences obtained can be used in the development of laboratory and industrial designs for the most effective cleaning of dusty gases and fluids. In addition, the resonance character of the coagulation time can be used in the diagnostics of suspensions.
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Document Type: Research Article

Publication date: May 1, 1996

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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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