### Abstract

Inertial focusing in a pressure-driven flow refers to the positioning of particles transverse to the mean flow direction that occurs as a consequence of a finite particle Reynolds number. In channels with rectangular cross-sections, and for a range of channel aspect ratios and particle confinement, experimental results are presented to show that both the location and the number of focusing positions depend on the number of particles per unit length along the channel. This axial number density is a function of both the channel cross-section and the particle volume fraction. These results are rationalized using simulations of the particle-laden flow to show the manner in which hydrodynamic interactions set the preferred locations in these confined flows. A criterion is presented for the occurrence of a stepwise transition from one to two or more trains of particles.

Original language | English (US) |
---|---|

Article number | 081703 |

Journal | Physics of Fluids |

Volume | 22 |

Issue number | 8 |

DOIs | |

State | Published - Aug 2010 |

### All Science Journal Classification (ASJC) codes

- Computational Mechanics
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Fluid Flow and Transfer Processes

## Fingerprint Dive into the research topics of 'Axial and lateral particle ordering in finite Reynolds number channel flows'. Together they form a unique fingerprint.

## Cite this

*Physics of Fluids*,

*22*(8), [081703]. https://doi.org/10.1063/1.3478311