Abstract
An experimental study was carried out on the flow pattern of particles at the cross section of a horizontally rotating cylinder with twenty-three kinds of particulate systems of different characteristics. The following relations were obtained as the experimental results.
(1) The width of the static zone was expressed with the volumetric charge ratio of particles F/V(-) and the mixing Froude number N2R/g(-) in the following equation.
(h/R)=[a-b(N2R/g)](F/V)
where, h is the width of the static zone (cm), R is the inner radius of the cylinder (cm), N is the rotating speed of the cylinder (1/min), F is the total volume of particles charged in the cylinder (cm3), V is the inner volume of the cylinder (cm3) and g is the acceleration of gravity (cm/min2) respectively, and a and b are the experimental constants.
(2) The following relation was obtained between the mean circulation time of particles T(sec) and the rotating speed N'(1/sec) for the range of rotating speed less than one revolution per second or so.
N'T=0.77(F/V)1/2
