Determination of Mixing Times with Helical Ribbon Impeller for Non-Newtonian Viscous Fluids Using an Advanced Imaging Method

摘要

New results on mixing times for viscous Newtonian and non-Newtonian fluids being homogenized with a helical ribbon impeller are presented.In particular,a recently developed technique to determine the macromixing kinetics of an impeller in a transparent vessel was applied to investigate the effects of rheological properties on mixing times.Significant differences were observed in the mixing times for viscous Newtonian and non-Newtonian fluids.Based on the new data obtained in this work,a correlation incorporating the elastic effects is proposed in terms of a Weissenberg number for predicting the mixing time as a function of the Reynolds number and the system geometry.