LAUSR

High-speed rotating equipment can be used in the devolatilization of high-viscosity polymer fluids, where the surface renewal is regarded as an important factor on the mass transfer. In this work, based on the verification of CFD simulation with the flow visualization experiment, the width, residence time and velocity of the filament from a rotor were studied by VOF model, including the influence of rotational speed, fluid viscosity, surface tension et al. A Surface-Renewal-Stretch (SRS) model was built to acquire surface renewal rate (Sp). The results show that Sp along the stretching direction of the filament generally reaches a maximum value as soon as its formation, while Sp decreases sharply in a relatively short distance. The Reynolds number and Weber number of the rotor together with the radial distance were used to describe Sp under various conditions for the evaluation of mass transfer performance of such high-speed disperser.