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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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Publication details

The article was received on 04 Mar 2016, accepted on 16 Jun 2016 and first published on 16 Jun 2016


Article type: Paper
DOI: 10.1039/C6LC00314A
Author version available: Download Author version (PDF)
Citation: Lab Chip, 2016,16, 2840-2850
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    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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