Abstract
Behavior of particles on a vibrating plate was investigated both theoretically and experimentally. The applied vibration was 39kHz-ultrasonic, and the diameters of test powders were in the range of Dp50=0.5 to 46μm. The experimental results showed that all particles moved randomly on the vibrating plate. Fine particles, approximately 10μm or less in median diameter, formed many small agglomerates, which also vibrated with their shapes and sizes intact. The size distribution of agglomerates could be represented by a log-normal distribution, and the median diameter of agglomerates increased with decreasing primary particle diameter. The agglomeration mechanism was theoretically analyzed by use of adhesive and separation stresses in an agglomerate. The analysis showed that the agglomerate diameter was inversely proportional to primary particle diameter. Furthermore, it was shown that the compressive breaking load could be estimated from the analysis.
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