Dynamic shape factors of regular shaped agglomerates

Abstract

Settling velocities of regular shaped agglomerates were measured in a cylindrical container filled with viscous silicone oil. The wall effect 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 polyhedron or other positions on the surface of the central sphere. Dynamic shape factors were correlated to the coverage of the central sphere, the diameter ratio of the peripheral to central spheres, the number of peripheral spheres on the central one, and the space-averaged projection area of the agglomerate. The dynamic shape factor was found to be correlated most widely with coverage for various types of agglomerates within an error of about 4%. © 1995, The Society of Chemical Engineers, Japan. All rights reserved.