HYDRODYNAMIC STUDY OF GRANULATOR DISCS II - RESIDENCE TIME DISTRIBUTION AND AXIAL MIXING IN A 2-CASCADE EQUIPMENT

The authors have investigated the residence tune distribution of grain s in a continuously operating two-cascade granulator disc by feeding ( impulse disturbance) of marked (coloured) substances. They have determ ined the function between the virtual, the C-function based and the re duced average (mean) residence times, and the mixing coefficient as a function of disc rotation speed at two different axial angles, with pa rticular regard to bed conditions on the outer disc. They have shown t hat in the second cascade the mixing of particles is considerably less intensive than on the inner disc. Furthermore they indicate that ther e is a significant difference in substance segregation and process app lication between the two cascades, which are separated by a deflector ring.