Numerical investigations of micro-SLM extraction/stripping in a spiral channel. (2nd February 2020)

• Record Type: Journal Article
• Authors: Wang, Tao; Xie, Tingliang; Xu, Cong
• Is Part Of: Chemical engineering science. Volume 212(2020)
• Publication Date: 2020-02-02
• Subjects: Supported liquid membrane -- In situ microextraction/stripping -- Mass transfer mechanism -- Numerical simulation -- Dean flow; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2019.115344
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: SLM based in situ microextraction/stripping in a spiral channel. Mass transfer mechanism was first numerically investigated using a 3D model. Five different mass transfer mechanisms and a zoning map were first determined. Easy determination of mass transfer mechanism relying on two dimensionless numbers. Essential: the interplay of channel/membrane diffusions and channel convection. Abstract: Micro-supported liquid membrane (micro-SLM) extraction/stripping has attracted significant research attention because of its advantages. For both design and optimization purpose, a deep understanding of the mass transfer mechanisms in the micro-SLM process is of vital importance. However, the interplay between the channel diffusion, channel convection, and membrane transfer at the microscale results in complicated mass transfer patterns. The underlying mechanisms of these patterns are still unclear. In the present study, a comprehensive 3D numerical simulation was established to investigate the mass transfer behaviors in a spiral micro-SLM device. Five different mass transfer mechanisms were determined and explained in detail. Two dimensionless numbers were defined to differentiate between these mass transfer mechanisms and to generate a mechanism zoning map. The proposed model and the zoning map are very useful in predicting the mass transfer behaviors of the micro-SLM extraction/stripping process in both a laboratory environment and the industry.