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Droplet formation in microfluidic cross-junctions

Liu, Haihu and Zhang, Yonghao (2011) Droplet formation in microfluidic cross-junctions. Physics of Fluids, 23 (8). ISSN 1070-6631

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Abstract

Using a lattice Boltzmann multiphase model, three-dimensional numerical simulations have been performed to understand droplet formation in microfluidic cross-junctions at low capillary numbers. Flow regimes, consequence of interaction between two immiscible fluids, are found to be dependent on the capillary number and flow rates of the continuous and dispersed phases. A regime map is created to describe the transition from droplets formation at a cross-junction (DCJ), downstream of cross-junction to stable parallel flows. The influence of flow rate ratio, capillary number, and channel geometry is then systematically studied in the squeezing-pressure-dominated DCJ regime. The plug length is found to exhibit a linear dependence on the flow rate ratio and obey power-law behavior on the capillary number. The channel geometry plays an important role in droplet breakup process. A scaling model is proposed to predict the plug length in the DCJ regime with the fitting constants depending on the geometrical parameters.

Item type: Article
ID code: 32838
Keywords: microfluidics, lattice Boltzmann model, droplet formation, flow regime, cross-junctions, Mechanical engineering and machinery, Physics, Mechanical Engineering, Fluid Flow and Transfer Processes
Subjects: Technology > Mechanical engineering and machinery
Science > Physics
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Technology and Innovation Centre > Advanced Engineering and Manufacturing
Depositing user: Pure Administrator
Date deposited: 29 Aug 2011 10:39
Last modified: 23 Sep 2018 08:07
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URI: https://strathprints.strath.ac.uk/id/eprint/32838
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