Journal
CHEMICAL ENGINEERING & TECHNOLOGY
Volume 44, Issue 2, Pages 365-370Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ceat.202000396
Keywords
Flow patterns; Liquid‐ liquid flows; Microchannels; Plug flows; Viscosity ratios
Categories
Funding
- RFBR (Russian Foundation for Basic Research) [19-38-90175]
- IT SB RAS
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Experimental study shows that different viscosity ratios lead to different flow patterns of liquid-liquid flow in T-shaped microchannels, with negligible influence on the velocity and length of plug flow pattern. Despite significant interface deformations, the viscosity ratio has little impact on the plug length and velocity.
The ratio of the dispersed phase viscosity to that of the continuous phase is a critical parameter for microfluidic two-phase flows. Here, the influence of the viscosity ratio on liquid-liquid flow in T-shaped microchannels is studied experimentally. Three basic flow patterns, i.e., parallel, plug, and droplet flow, are observed for different sets of immiscible liquids. Flow pattern maps are plotted and generalized using a combination of Weber and Ohnesorge dimensionless numbers. In the plug flow pattern, interface deformations occur for low viscosity ratios. Existing correlations from the literature are tested against experimental data for plug velocity and lengths. Despite the significant plug interface deformations, the influence of the viscosity ratio on the plug length and velocity is negligible.
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