Visualization of Hydrodynamic Particle Interactions: Validation of a Numerical Model
Abstract:An experimental study is presented to investigate hydrodynamic interactions acoustically induced between particles in monodiperse aerosols. In particular, hydrodynamic mechanisms of viscous origin dominating these interactions are analyzed for several orientations of the particle center-lines with respect to the acoustic axis. The measurements were carried out in standing wave field with a homogeneous and well determined acoustic velocity field. A CCD-camera with a microscope lens attachment was used to visualize the displacements of 7.9 μm glass beads in a frequency of 3 kHz under Oseen flow conditions. A number of 46 attraction processes between pairs of particles were visualized and quantified in the experiments. Maximal attractions were found for particles aligned along the acoustic field direction, requiring the shortest times to collide. These observations are in agreement with other previous experiments  carried out to verify the hydrodynamic interaction known as the "acoustic wake effect". In the present paper the dependence of this interaction on the initial conditions of the particles is analyzed. Attractions become weaker when the angle formed by the particle center-line and the acoustic axis increases. Attraction patterns including collisions have been found and quantified for angles of the particle center-line up to 45° off the acoustic axis. The experimental data were positively compared with the results of a numerical study developed by the authors in a recent paper  in such a way that the numerical model has been now validated.
Document Type: Research Article
Publication date: January 1, 2002
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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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