Interfacial mass transfer intensification with highly viscous mixture

Many investigations find that mass transfer efficiency decreases dramatically with increasing viscosity, which poses challenges to the industrial processes with the highly viscous mixture. We use liquid films on a vertical plate with windows to address this problem. The hybrid twin-liquid films combine the motility of free-falling films with the stability of wall-bounded films. In this study, the film thickness distributions are measured experimentally, and the detailed hydrodynamics and mass transfer process are studied with numerical simulations. The results reveal the hydrodynamic and mass transfer behaviors of highly viscous twin-liquid films. Due to gravity acceleration inside the window, the maximum velocity of liquid films increases by 2.5-16 times, and the maximum local mass transfer rate increases by 2-6.5 times in our simulations. We conclude that compared with conventional methods, open windows significantly enhance mass transfer in viscous liquid films without additional cost. (c) 2021 Elsevier Ltd. All rights reserved.

Automated summary

Research shows that mass transfer efficiency decreases with increasing viscosity, posing challenges for industrial processes. By using twin-liquid films with open windows, the velocity and mass transfer rate of highly viscous films are significantly increased. This method enhances mass transfer without additional cost, providing a more efficient solution for highly viscous mixtures.