Abstract
Several kinds of powders were dispersed into the air by use of mixer type and nozzle-jet type dry dispersers, and the size distributions of the dispersed aerosol particles were measured. In the data analysis, a newly defined dispersion efficiency was introduced in order to represent the dispersion state of aerosols. On the other hand, the adhesion characteristic value representing the inter-particle adhesive force was obtained through the particle-reentrainment test developed in our laboratry. The data treatment made it possible to quantitatively evaluate the disperser performance for different kinds of powders. It was found that the dispersion efficiency was well correlated with the adhesion characteristic value if the mass flow ratio between particles and air was kept constant. Therefore, the dispersion efficiency of an arbitrary powder can be estimated by the particle-reentrainment test.
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