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Asymmetric rectified electric fields generate flows that can dominate induced-charge electrokinetics

Aref Hashemi, Gregory H. Miller, and William D. Ristenpart
Phys. Rev. Fluids 5, 013702 – Published 8 January 2020

Abstract

We derive a generalized induced-charge electrokinetic (ICEK) velocity around a conducting object placed in an arbitrary multimodal electric field. The generalized model allows consideration of asymmetric rectified electric fields (AREFs), which have recently been established to occur in liquids where the ions present have unequal mobilities. Including the AREF yields fluid velocities in which both the direction and the magnitude depend sensitively on the applied potential, frequency, ionic type and strength, and even the exact placement of the object between parallel electrodes. The results provide an explanation for the long-standing question of flow reversals observed in ICEK systems.

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  • Received 16 July 2019
  • Corrected 14 May 2021

DOI:https://doi.org/10.1103/PhysRevFluids.5.013702

©2020 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Corrections

14 May 2021

Correction: Minor errors in Eqs. (23a) and (23c) have been fixed.

Authors & Affiliations

Aref Hashemi, Gregory H. Miller*, and William D. Ristenpart

  • Department of Chemical Engineering, University of California Davis, Davis, California 95616, United States

  • *grgmiller@ucdavis.edu
  • wdristenpart@ucdavis.edu

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Issue

Vol. 5, Iss. 1 — January 2020

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