Vortices of electro-osmotic flow in heterogeneous porous media
Name
PhysRevFluids.5.103701.pdf
Description
Published version
Size
5.61 MB
Format
Adobe PDF
Checksum (MD5)
bfc377ca60991d9c0e15868d00decfc8
Author(s)
Mirzadeh, Mohammad
Zhou, Tingtao
Amooie, Mohammad Amin
Fraggedakis, Dimitrios
Ferguson, Todd R
Bazant, Martin Z
Date Issued
2020
Journal
Physical Review Fluids
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 American Physical Society. Traditional models of electrokinetic transport in porous media are based on homogenized material properties, which neglect any macroscopic effects of microscopic fluctuations. This perspective is taken not only for convenience but also motivated by the expectation of irrotational electro-osmotic flow, proportional to the electric field, for uniformly charged surfaces (or constant ζ potential) in the limit of thin double layers. Here, we show that the inherent heterogeneity of porous media generally leads to macroscopic vortex patterns, which have important implications for convective transport and mixing. These vortical flows originate due to competition between pressure-driven and electro-osmotic flows, and their sizes are characterized by the correlation length of heterogeneity in permeability or surface charge. The appearance of vortices is controlled by a single dimensionless control parameter, defined as the ratio of a typical electro-osmotic velocity to the total mean velocity.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Mathematics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevFluids.5.103701
