Analysis of particle dynamics in a rotating dish

Although the rotating dishes are widely used in industrial processes, there are not many studies regarding the behavior of granular flow in this type of device. It is reported that the particle dynamics directly influences the dish performance in relation to its applications, e.g., in the granulation process. This work provides an experimental study about the effect of the main variables (rotational speed, angle of inclination, and physical properties of particles) on the behavior of particle dynamics in a rotating dish. The conditions, under which transitions between the flows regimes (rolling, cascading, cataracting, and centrifuging) occurred, were identified and the effects of the studied variables were quantified. The increase in the rotational speed and filling degree and the decrease in the angle of inclination caused a decrease in the angle of departure of the particles and anticipated the transition between flow regimes, demonstrating that both responses are correlated. Correlations proposed in the literature for predictions of the critical rotational speed related to the centrifuging regime were analyzed. A new equation was proposed, which reduced the average percentage deviation from 52.83% to 14.27% when compared to experimental data.