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Issue 15, 2016
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Direct measurement of particle inertial migration in rectangular microchannels

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Abstract

Particles traveling at high velocities through microfluidic channels migrate from their starting streamlines due to inertial lift forces. Theories predict different scaling laws for these forces and there is little experimental evidence by which to validate theory. Here we experimentally measure the three dimensional positions and migration velocities of particles. Our experimental method relies on a combination of sub-pixel accurate particle tracking and velocimetric reconstruction of the depth dimension to track thousands of individual particles in three dimensions. We show that there is no simple scaling of inertial forces upon particle size, but that migration velocities agree well with numerical simulations and with a two-term asymptotic theory that contains no unmeasured parameters.

Graphical abstract: Direct measurement of particle inertial migration in rectangular microchannels

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Supplementary files

Article information


Submitted
04 Mar 2016
Accepted
16 Jun 2016
First published
16 Jun 2016

Lab Chip, 2016,16, 2840-2850
Article type
Paper
Author version available

Direct measurement of particle inertial migration in rectangular microchannels

K. Hood, S. Kahkeshani, D. Di Carlo and M. Roper, Lab Chip, 2016, 16, 2840
DOI: 10.1039/C6LC00314A

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