Shear-induced diffusion of platelike particles in microchannels

Roberto Rusconi; Howard A. Stone

doi:10.1103/PhysRevLett.101.254502

Shear-induced diffusion of platelike particles in microchannels

Roberto Rusconi, Howard A. Stone

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

We exploit the recent developments of microfluidic technologies to investigate the collective shear-induced diffusion in suspensions of micron-sized particles. Whereas spherical particles do not diffuse on the time scale of our experiments, the results with platelike clay particles show a strong cross-stream shear-induced diffusivity at low volume fraction (0≤0.01). Moreover, we find a linear dependence of the collective diffusion coefficient with the average shear rate (in the range 102-104s-1) and the particle concentration. These data are in good agreement with previous experimental and theoretical results for spheres when rescaled with the particle number density.

Original language	English (US)
Article number	254502
Journal	Physical review letters
Volume	101
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.101.254502
State	Published - Dec 15 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.101.254502

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abstract = "We exploit the recent developments of microfluidic technologies to investigate the collective shear-induced diffusion in suspensions of micron-sized particles. Whereas spherical particles do not diffuse on the time scale of our experiments, the results with platelike clay particles show a strong cross-stream shear-induced diffusivity at low volume fraction (0≤0.01). Moreover, we find a linear dependence of the collective diffusion coefficient with the average shear rate (in the range 102-104s-1) and the particle concentration. These data are in good agreement with previous experimental and theoretical results for spheres when rescaled with the particle number density.",

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AB - We exploit the recent developments of microfluidic technologies to investigate the collective shear-induced diffusion in suspensions of micron-sized particles. Whereas spherical particles do not diffuse on the time scale of our experiments, the results with platelike clay particles show a strong cross-stream shear-induced diffusivity at low volume fraction (0≤0.01). Moreover, we find a linear dependence of the collective diffusion coefficient with the average shear rate (in the range 102-104s-1) and the particle concentration. These data are in good agreement with previous experimental and theoretical results for spheres when rescaled with the particle number density.

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Shear-induced diffusion of platelike particles in microchannels

Abstract

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