DYNAMIC SHAPE FACTORS OF REGULAR SHAPED A GGLOMERATES

Settling velocities of regular shaped agglomerates were measured in a cylindrical container filled with viscous silicone oil. The wall effec t was corrected by introducing a linear function of the diameter ratio of particle and container. Model agglomerates were made of a central sphere and 1 to 14 peripheral spheres placed at apexes of the polyhedr on or other positions on the surface of the central sphere. Dynamic sh ape factors were correlated to the coverage of the central sphere, the diameter ratio of the peripheral to central spheres, the number of pe ripheral spheres on the central one, and the space-averaged projection area of the agglomerate. The dynamic shape factor was found to be cor related most widely with coverage for various types of agglomerates wi thin an error of about 4%.