抄録
The dispersion mechanism of a mixer-type disperser has been studied both experimentally and theoretically. The size distribution of dispersed aerosol particles was measured by a cascade impactor, and the size distribution of primary particles constituting the agglomerated particles on each stage of the impactor was also measured. These size distributions were analyzed to reveal the dispersion characteristics by introducing newly defined partial dispersion efficiency.
It was found that the dispersibility of agglomerated particles depended both on the size of primary particles and the morphological structure of agglomerated particles. The agglomerates made up of the particles having a size near the mass median diameter were easily dispersed. It was, however, difficult to disperse the particles having their diameters in the tails of the size distribution of the feed powder. These results were well explained by the dispersion model where the dispersion force was mainly supplied by an acceleration of fluid motion. This fact suggests that further improvement is needed in the mixer-type disperser.
