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Abstract

Kahkeshani et al. (J. Fluid Mech., vol. 786, 2016, R3) have studied particle ordering in suspension flow in a rectangular microchannel. Experiments and numerical simulations reveal that inertial focusing and hydrodynamic interactions result in long-lived ‘trains’ of regularly spaced particles. The preferred spacing is frustrated at sufficient particle concentration, an important feature for applications.

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      High-speed trains: in microchannels?
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Copyright
Corresponding author
Email address for correspondence: morris@ccny.cuny.edu
References
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Anna S. L, Bontoux N. & Stone H. A. 2003 Formation of dispersions using ‘flow focusing’ microchannels. Appl. Phys. Lett. 82, 364366.
Chun B. & Ladd A. J. C. 2006 Inertial migration of neutrally buoyant particles in a square duct: an investigation of multiple equilibrium positions. Phys. Fluids 18, 031704.
Ho B. P. & Leal L. G. 1974 Inertial migration of rigid spheres in two-dimensional unidirectional flows. J. Fluid Mech. 65, 365400.
Humphry K. J., Kulkarni P. M., Weitz D. A., Morris J. F. & Stone H. A. 2010 Axial and lateral ordering in finite Reynolds number channel flows. Phys. Fluids 22, 081703.
Hur S. C., Henderson-MacLenna N. K., McCabe E. R. B. & Di Carlo D. 2011 Deformability-based cell classification and enrichment using inertial microfluidics. Lab on a Chip 11, 911920.
Kahkeshani S., Haddadi H. & Di Carlo D. 2016 Preferred interparticle spacings in trains of particles in inertial microchannel flows. J. Fluid Mech. 786, R3.
Ladd A. J. C. 1994 Numerical simulations of particulate suspensions via a discretized Boltzmann equation. Part 1. Theoretical foundation. J. Fluid Mech. 271, 285309.
Matas J.-P., Glezer V., Morris J. F. & Guazzelli É. 2004 Trains of particles in finite-Reynolds number pipe flow. Phys. Fluids 16, 41924195.
Miura K., Itano T. & Sugihara-Seki M. 2014 Inertial migration of neutrally buoyant spheres in a pressure-driven flow through square channels. J. Fluid Mech. 749, 320330.
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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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Keywords:

Type Description Title
VIDEO
Movies

Morris supplementary movie
Video microscopy taken at the end of channel (at 3 cm from inlet) at channel Reynolds number $Re = 30$ showing ordered arrangement.

 Video (1.7 MB)
1.7 MB
VIDEO
Movies

Morris supplementary movie
Typical video microscopy taken at the inlet of channel showing entry from one arm, with random particle arrangement.

 Video (972 KB)
972 KB
VIDEO
Movies

Morris supplementary movie
Video microscopy taken at the end of channel (at 3 cm from inlet) at channel Reynolds number $Re = 90$ of channel showing ordered arrangement at average separation smaller than in the case of $Re=30$ (shown in Movie 2).

 Video (2.9 MB)
2.9 MB
VIDEO
Movies

Morris supplementary movie
Video microscopy taken at the end of channel (at 3 cm from inlet) at channel Reynolds number $Re = 30$ showing ordered arrangement.

 Video (285 KB)
285 KB
VIDEO
Movies

Morris supplementary movie
Typical video microscopy taken at the inlet of channel showing entry from one arm, with random particle arrangement.

 Video (3.2 MB)
3.2 MB
VIDEO
Movies

Morris supplementary movie
Video microscopy taken at the end of channel (at 3 cm from inlet) at channel Reynolds number $Re = 90$ of channel showing ordered arrangement at average separation smaller than in the case of $Re=30$ (shown in Movie 2).

 Video (779 KB)
779 KB

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