Abstract
Scaling law of fine particle classification by a centrifugal system was studied in the present work. The centrifugal system accurately classifies fine particles suspended in a liquid (water) at a low concentration by applying an almost rigidly rotating through-flow between the housing- and core-walls of a rotating double-walled container. We performed calssification experiments under various conditions by changing classifier size, feeder, true relative density and size of feed powders, and Ekman and Rossby numbers. Consequently, we found that the scaling law is such that the ratio of cut-off size to the length scale of the fluid or particle motion (characteristic length of the classifier) is determined as a function only of the centrifugal-effect parameter which is the ratio of centrifugal force to drag force exerting on a particle.
