Fundamental studies of the mechanism of noise generation, i.e. continuous acoustic signals, were performed by analyzing the noise and burst acoustic signals emitted by the impact of particles on a plate or generated by particles suspended in liquid and agitated in a vessel. High-frequency noise signals exhibited characteristic changes relative to the size and number of particles. An increase in the size or in the number of particles increased the event rate, energy rate, oscillation rate, and frequency power spectra. The fundamental frequencies of vibration were estimated. The calculated frequencies of vibration arising from particle-plate impacts were in good agreement with the measured frequencies. An empirical relation between relative energy of the noise and the diameter and number of particles was also derived. Techniques of agglomeration in liquids were used to produce zirconia microspheres with diameters less than 500 μm. A monitoring system that utilizes changes in turbidity of suspension and noise emitted during the process of agglomeration was developed to repeatedly produce agglomerates with desired properties. The technical feasibility of the on-line monitoring of the agglomerate diameter and recovery was demonstrated by measuring relative energy and laser attenuation.
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Physical and Theoretical Chemistry
- Industrial and Manufacturing Engineering
- Materials Chemistry