Liquid–Liquid Two-Phase Flow Patterns in Y-Junction Microchannels

Abstract

Experiments are carried out to study liquid− liquid two-phase flow patterns in Y-junction microchannels etched in glass chips. The liquid−liquid test systems used in the experiments are the three standard test systems recommended by the European Federation of Chemical Engineering (EFCE) for extraction studies. Four different flow patterns slug flow, slug and droplet flow, droplet flow, and parallel floware observed. Effects of microchannel diameter, flow rate, interfacial tension of the liquids, and hydrophobicity of channel wall on two-phase flow patterns have been studied, and flow regime maps are presented and discussed.

Hydrodynamic Investigation on Deep Desulfurization of Liquid Fuel at the Microscale

“…Furthermore, drop flow was observed with moderate increase of the PEG200 velocity and keeping low fuel velocity. These results are in line with the observations of Darekar et al [51].…”

Liquid‐liquid two‐phase flow patterns in a new helical microchannel device

“…The n ‐butyl acetate‐water and butanol‐water were recommended as standard test systems by the European Federation of Chemical Engineering (EFCE) . The interfacial tension of the above three systems varied from a very high value to a very low value, therefore, they were suitable for the study of universal flow pattern maps . In order to verify the validity of the proposed universal flow pattern map in predicting flow patterns, three unconventional systems without mass transfer (0.1 g/g (10 %) TBP‐water, 0.2 g/g (20 %) TBP‐water, and 0.8 g/g (80 %) TBP‐water) and one unconventional system with mass transfer (0.8 g/g (80 %) TBP‐0.62 g/g (62 %) H 3 PO 4 ) were considered.…”

“…The Ohnesorge number ( Oh = μ /( ρσd H ) 1/2 ) is a dimensionless number that represents the ratio of viscous forces to inertia and surface tension forces. We · Oh as a new parameter including various parameters ( ρ , μ , σ, d H , u ) was used to present the universal flow pattern map by Yagodnitsyna et al and Darekar et al, in which a good agreement with the data of Zhao et al and Kashid et al was demonstrated, respectively. Therefore, We · Oh was chosen as coordinates to present the universal flow pattern map in this work, as shown in Figure .…”

“…[31] The interfacial tension of the above three systems varied from a very high value to a very low value, therefore, they were suitable for the study of universal flow pattern maps. [27] In order to verify the validity of the proposed universal flow pattern map in predicting flow patterns, three unconventional systems without mass transfer (0.1 g/g (10 %) TBP-water, 0.2 g/g (20 %) TBPwater, and 0.8 g/g (80 %) TBP-water) and one unconventional system with mass transfer (0.8 g/g (80 %) TBP-0.62 g/g (62 %) H 3 PO 4 ) were considered. n-Butyl acetate and butanol were respectively saturated with water and water was respectively saturated with n-butyl acetate and butanol before conducting the experiments.…”

“…They also pointed out that the model may lack universality because it was not compared with other models reported previously in the literature. Yagodnitsyna et al and Darekar et al proposed universal flow pattern maps with We · Oh as coordinates. The results showed an agreement with data provided in other literature.…”