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Brazilian Journal of Physics

, Volume 49, Issue 1, pp 140–150 | Cite as

Self-assembly of Droplets in a Straight Microchannel

  • Erfan KadivarEmail author
  • Mojtaba Farrokhbin
  • Fatemeh Ghasemipour
Statistical
  • 16 Downloads

Abstract

In this work, self-assembly of periodic zigzag arrangement of monodisperse droplets through a flat microfluidic channel is numerically investigated. Our numerical technique is based on the boundary element method (BEM). It is found that droplets having zigzag arrangement tend to travel to channel centerline. We exhibit that non-deformable droplets do not drift normal to the channel centerline. While, as the capillary number increases, deformable droplets tend to approach more to the center of channel and their vertical velocity component increases. Our numerical results illustrate that droplets are dragged by a constant horizontal velocity component which is governed by the continuous phase flow rate. However, this situation is completely different for the vertical velocity component of droplets. We report how the vertical velocity component of droplet towards the channel centerline depends on control parameters such as droplet size, droplet distance, initial configuration, relative orientation of droplets, and capillary number. This dependency plays an important role in estimating necessary time to reach self-assembly.

Keywords

Droplet migration Deformable droplets Solid particles Microfluidics Boundary element method 

Notes

Acknowledgments

Kadivar acknowledges the support of Shiraz University of Technology Research Council.

Author Contributions

EK designed the research and developed the simulation code. MF and FG ran the simulations. EK analyzed and interpreted the results and wrote the manuscript.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© Sociedade Brasileira de Física 2018

Authors and Affiliations

  • Erfan Kadivar
    • 1
    Email author
  • Mojtaba Farrokhbin
    • 2
  • Fatemeh Ghasemipour
    • 3
  1. 1.Department of PhysicsShiraz University of TechnologyShirazIran
  2. 2.Department of Physics, Faculty of SciencesYazd UniversityYazdIran
  3. 3.Department of PhysicsShahid Beheshti UniversityTehranIran

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