Concentration polarization, surface currents, and bulk advection in a microchannel.

@article{Nielsen2014ConcentrationPS,
  title={Concentration polarization, surface currents, and bulk advection in a microchannel.},
  author={Christoffer P. Nielsen and Henrik Bruus},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2014},
  volume={90 4},
  pages={043020}
}
We present a comprehensive analysis of salt transport and overlimiting currents in a microchannel during concentration polarization. We have carried out full numerical simulations of the coupled Poisson-Nernst-Planck-Stokes problem governing the transport and rationalized the behavior of the system. A remarkable outcome of the investigations is the discovery of strong couplings between bulk advection and the surface current; without a surface current, bulk advection is strongly suppressed. The… CONTINUE READING
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