Three-Dimensional Model on Liquid–Liquid Mass Transfer of the Kenics Static Mixer: Considering Dynamic Droplet Size Distribution

Abstract

The Kenics static mixer is anticipated to replace conventional extraction apparatuses because of its outstanding mass transfer performances and economy. The lack of a practicable mass transfer model limits its wide application. In this study, a three-dimensional liquid–liquid mass transfer model was developed for the Kenics static mixer while considering the dynamic droplet size distribution due to both interphase mass transfer and droplet breakage and coalescence. It has been proven to have good accuracy because of the mean relative errors between simulated and experimental results within 7%. Different hydrodynamic and mass transfer behaviors were found at different fluid velocities. The patterns thus presented were supported by other publications as an additional proof of the constructed model’s accuracy. It was also found from the effect analysis on fluid velocity that the static mixer, even with few mixing elements (5) and at a low total inlet fluid velocity (0.7 m/s), can achieve excellent mass transfer performance.