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Electrophoretic slip-tuned particle migration in microchannel viscoelastic fluid flows

Di Li and Xiangchun Xuan*

  • Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634-0921, USA

  • *xcxuan@clemson.edu
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Phys. Rev. Fluids 3, 074202 – Published 5 July, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.074202

Abstract

Particle migration is the underlying mechanism for continuous-flow focusing, trapping, and sorting of various types of particles in microfluidic devices. We present in this work an experimental investigation of the cross-stream migration of spherical polystyrene particles in a combined pressure- and electric field-driven flow of viscoelastic fluid through a straight rectangular microchannel. We find that particles migrate toward the centerline of the channel if they are leading the hydrodynamic flow due to positive electrophoresis. Conversely, lagging particles due to negative electrophoresis migrate toward the walls of the channel. These migrations are found to be exactly opposite to those in a Newtonian fluid in our control experiment. We attribute this phenomenon to the shear-induced extra lift in a viscoelastic fluid that has been recently predicted to arise from the nonlinear coupling of the electrophoretic particle motion with the local flow field. The effects of hydrodynamic flow rate and electric field magnitude on the bidirectional particle migrations are studied, which can both be reasonably explained using the theoretical formula of the electrophoretic motion-induced extra lift in a viscoelastic shear flow.

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Phys. Rev. Fluids 3, 074202– Published 5 July, 2018
  • Received 15 January 2018
Article part of CHORUS
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