Axial dispersion of Brownian colloids in microfluidic channels

Michael P. Howard, Aishwarya Gautam, Athanassios Z. Panagiotopoulos, Arash Nikoubashman

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We present a complete theoretical framework for the axial dispersion of a Brownian colloidal suspension confined in a parallel plate channel, extending the Taylor-Aris treatment to particles with diameters comparable to the channel width. The theoretical model incorporates the effects of confinement on the colloid distribution, corrections to the velocity profile due to the effects of colloid concentration on the suspension viscosity, and position-dependent diffusivities. We test the theoretical model using explicit-solvent molecular dynamics simulations that fully incorporate hydrodynamic correlations and thermal fluctuations and obtain good quantitative agreement between theory and simulations. We find that the nonuniform colloid distributions that arise in confinement due to excluded volume between the colloids and channel walls significantly impact the axial dispersion.

Original languageEnglish (US)
Article number044203
JournalPhysical Review Fluids
Volume1
Issue number4
DOIs
StatePublished - Aug 19 2016

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Modeling and Simulation
  • Fluid Flow and Transfer Processes

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