CFD study of the effect of rotation speed on dynamic air separator flow characteristics and pressure drop

Dynamic air separator diphase is a device for selecting particulate matter into coarse and fine fractions. This equipment is widely used in grinding circuits in cement plants and other industrial minerals. In this paper, we will try to simulate a dynamic separator in order to make design improvements of dynamic cyclones where conditions are simulated using the Fluent 6.3 industrial code. This paper presents a computational fluid dynamics (CFD) analysis of the gas-solid flow inside a dynamic separator. The Reynolds Stress Model RSM is used to predict the pressure drop inside the dynamic separator. The effect of the rotation speed on the flow features and separation performance is also investigated in this study. Predicted results showed that rising of the rotational speed of rotor increases the pressure drop calculated across the dynamic separator which unfortunately increases the energy consumption of the cement plant which is not good for environment Also, the rising of the rotational speed improves the occurrence of secondary recirculation flows and reversal flow in the rotor axis which weaken the classification efficiency of the dynamic separator.