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Driving factors of electro-convective instability in concentration polarization

Ramadan Abu-Rjal*, Isaak Rubinstein†, and Boris Zaltzman‡

  • Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 8499000, Israel

  • *aborgela@post.bgu.ac.il
  • †robinst@bgu.ac.il
  • ‡boris@bgu.ac.il
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Phys. Rev. Fluids 1, 023601 – Published 8 June, 2016

DOI: https://doi.org/10.1103/PhysRevFluids.1.023601

Abstract

Until recently, based on the analysis pertaining to a perfectly charge selective interface, electro-convective instability in concentration polarization was attributed to the nonequilibrium mechanism related to the extended space charge which forms next to that of the electric double layer near the limiting current. More recently it was shown that imperfect charge selectivity of the interface makes equilibrium instability possible, driven by either equilibrium electro-osmosis or bulk electro-convection, or both. In this paper we identify and analyze the major surface and bulk factors affecting the electro-convective instability. These factors, some known previously under the names of diffusio-osmosis, electro-osmosis, or bulk electro-convection, and some newly identified in this paper are manifestations of the electric force and pressure gradient, balanced by the viscous force acting in various locations in solution. The contribution of these factors to hydrodynamic stability in concentration polarization is analyzed for a varying charge selectivity of the interface.

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Outline

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Phys. Rev. Fluids 1, 023601– Published 8 June, 2016
  • Received 26 January 2016

©2016 American Physical Society

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