Numerical study of the formation and stability of a pair of particles of different sizes in inertial microfluidics

Krishnaveni Thota, Benjamin Owen, Timm Krüger*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The formation of pairs and trains of particles in inertial microfluidics is an important consideration for device design and applications, such as particle focusing and separation. We study the formation and stability of linear and staggered pairs of nearly rigid spherical particles of different sizes in a pressure-driven flow through a straight duct with a rectangular cross section under mild inertia. An in-house lattice-Boltzmann-immersed-boundary-finite-element code is used for three-dimensional simulations. We find that the stability and properties of pairs of heterogeneous particles strongly depend on particle sizes and their size ratio, while the formation of the pairs is also determined by the initial lateral position and the axial order of the particles. Our findings imply that perturbations of particle trajectories caused by other particles, as they are expected to happen even in dilute suspensions, can be important for the formation of stable pairs in inertial microfluidics.

Original languageEnglish
Article number032001
JournalPhysics of Fluids
Issue number3
Early online date1 Mar 2023
Publication statusPublished - Mar 2023

Keywords / Materials (for Non-textual outputs)

  • Inertial microfluidics
  • Heterogeneous size pairs
  • lattice Boltzmann method
  • Immersed Boundary Method
  • particle pairs
  • Featured Article


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