Parametric study of droplet size in an axisymmetric flow-focusing capillary device

doi:10.1016/j.cjche.2019.12.026

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (4): 1016-1022.DOI: 10.1016/j.cjche.2019.12.026

• Fluid Dynamics and Transport Phenomena • Previous Articles Next Articles

Parametric study of droplet size in an axisymmetric flow-focusing capillary device

Mostafa Rahimi¹, Sajad Yazdanparast², Pouya Rezai²

1 Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;
2 Department of Mechanical Engineering, York University, Toronto, ON, Canada

Received:2019-08-02 Revised:2019-11-02 Online:2020-07-27 Published:2020-04-28
Contact: Mostafa Rahimi
Supported by:
This project has received funding support from the Natural Sciences and Engineering Research Council of Canada (NSERC) to PR.

Parametric study of droplet size in an axisymmetric flow-focusing capillary device

Mostafa Rahimi¹, Sajad Yazdanparast², Pouya Rezai²

1 Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;
2 Department of Mechanical Engineering, York University, Toronto, ON, Canada

通讯作者: Mostafa Rahimi
基金资助:
This project has received funding support from the Natural Sciences and Engineering Research Council of Canada (NSERC) to PR.

Abstract

Abstract: A conventional technique for microfluidic droplet generation is Co-axial Flow Focusing (CFF) in which a contraction zone is placed downstream of the dispersed phase nozzle. In this contraction zone, the dispersed-phase (dphase) fluid is pinched off by continuous-phase (c-phase) fluid to generate micro-droplets. Studying the influence of multiple parameters such as the fluids velocities and viscosities, the interfacial tension, and nozzle and orifice diameters on the droplet size is of great importance for the design and application of CFF devices. Thus, development of more complete numerical models is required. In this paper, we show our model is compatible with experimental data and then numerically investigate the effects of aforementioned parameters on the droplet generation in a CFF microfluidic device. Simulation results showed that the c-phase flow rate, viscosity and the interfacial tension had great impacts on the droplet size. The effect of the nozzle diameter on the generated droplet size was small compared to that of the orifice in a CFF device. Using the simulation results, a correlation was also developed and suggested which predicts the droplet size with less than 15% error in a wide range of the introduced dimensionless parameters.

Key words: Co-axial Flow Focusing, Microfluidics, Droplet generation, Numerical investigation

摘要： A conventional technique for microfluidic droplet generation is Co-axial Flow Focusing (CFF) in which a contraction zone is placed downstream of the dispersed phase nozzle. In this contraction zone, the dispersed-phase (dphase) fluid is pinched off by continuous-phase (c-phase) fluid to generate micro-droplets. Studying the influence of multiple parameters such as the fluids velocities and viscosities, the interfacial tension, and nozzle and orifice diameters on the droplet size is of great importance for the design and application of CFF devices. Thus, development of more complete numerical models is required. In this paper, we show our model is compatible with experimental data and then numerically investigate the effects of aforementioned parameters on the droplet generation in a CFF microfluidic device. Simulation results showed that the c-phase flow rate, viscosity and the interfacial tension had great impacts on the droplet size. The effect of the nozzle diameter on the generated droplet size was small compared to that of the orifice in a CFF device. Using the simulation results, a correlation was also developed and suggested which predicts the droplet size with less than 15% error in a wide range of the introduced dimensionless parameters.

关键词: Co-axial Flow Focusing, Microfluidics, Droplet generation, Numerical investigation

Mostafa Rahimi, Sajad Yazdanparast, Pouya Rezai. Parametric study of droplet size in an axisymmetric flow-focusing capillary device[J]. Chinese Journal of Chemical Engineering, 2020, 28(4): 1016-1022.

Mostafa Rahimi, Sajad Yazdanparast, Pouya Rezai. Parametric study of droplet size in an axisymmetric flow-focusing capillary device[J]. 中国化学工程学报, 2020, 28(4): 1016-1022.

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Parametric study of droplet size in an axisymmetric flow-focusing capillary device

Parametric study of droplet size in an axisymmetric flow-focusing capillary device

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