Abstract
Acoustic-gravity coupled fields have been investigated for particle separation and characterization. A standing ultrasound force allows particles to aggregate to a node or antinode. In this study, 444 kHz ultrasound is irradiated to a glass capillary cell (0.5mm I.D.×8.8mm) filled with water, and particles aggregation is observed with varying ultrasound energy. An average acoustic energy density, which is an important factor for describing an ultrasonic field, is measured by studying the dependence of the equilibrium positions of polystyrene latexes on the supplied voltage. The equilibrium positions of particulate materials are determined by their density and compressibility, whereas those of porous silica gel particles are a function of their porosities in addition to these physical parameter. Thus, the acoustic-gravity field is applicable to the material characterization, and can provide a novel principle for particle separation.
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