Deionization shock driven by electroconvection in a circular channel
Name
PhysRevFluids.4.113701.pdf
Description
Published version
Size
1.82 MB
Format
Adobe PDF
Checksum (MD5)
c2e3562840f921d65b575fcc4f8371e5
Author(s)
Gu, Zhibo
Xu, Bingrui
Huo, Peng
Rubinstein, Shmuel M
Bazant, Martin Z
Deng, Daosheng
Date Issued
2019
Journal
Physical Review Fluids
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2019 American Physical Society. In a circular channel passing overlimiting current (faster than diffusion), transient vortices of bulk electroconvection are observed in a salt-depleted region within the horizontal plane. The spatiotemporal evolution of the salt concentration is directly visualized, revealing the propagation of a deionization shock wave driven by bulk electroconvection up to millimeter scales. This mechanism leads to quantitatively similar dynamics as for deionization shocks in charged porous media, which are driven instead by surface conduction and electro-osmotic flow at micron to nanometer scales. The remarkable generality of deionization shocks under overlimiting current could be used to manipulate ion transport in complex geometries for desalination and water treatment.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
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.4.113701
