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

Mostafa Rahimi; Sajad Yazdanparast; Pouya Rezai

doi:10.1016/j.cjche.2019.12.026

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

Fluid Dynamics and Transport Phenomena | Updated：2026-01-06

- Parametric study of droplet size in an axisymmetric flow-focusing capillary device
- Chinese Journal of Chemical Engineering Vol. 28, Issue 4, Pages: 1016-1022(2020)
- Affiliations：
  
  1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil,Iran
  2. Department of Mechanical Engineering, York University,, ON,Toronto,Canada
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2019.12.026
  CLC：
- Published：2020
- Accepted：
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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.
DOI：

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. DOI： 10.1016/j.cjche.2019.12.026.

摘要

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.

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