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Related Experiment Videos

Bulk electroconvection in electrolyte.

Tamara Pundik1, Isaak Rubinstein, Boris Zaltzman

  • 1DSEEP, Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 21, 2006
PubMed
Summary
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Bulk electroconvection in strong electrolytes is stable, with no instability arising from uniform charge selective solids. However, nonuniform surfaces can induce fully developed bulk electroconvection flows.

Area of Science:

  • Electrochemistry
  • Fluid Dynamics
  • Physical Chemistry

Background:

  • Bulk electroconvection involves flow induced by electric fields acting on space charges in electrolytes.
  • A long-standing debate exists regarding the stability of electric conduction across charge selective solids and the development of bulk electroconvection.
  • Previous linear stability analyses suggested nonexistence of bulk electroconvective instability.

Purpose of the Study:

  • To investigate the stability of bulk electroconvection at uniform charge selective solids.
  • To determine if bulk electroconvection can develop into a fully fledged flow at nonuniform charge selective solids.

Main Methods:

  • Numerical simulations were employed to analyze bulk electroconvection.
  • The study confirmed previous linear stability analysis results.

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Main Results:

  • Numerical results confirmed the nonexistence of bulk electroconvective instability at uniform charge selective solids.
  • Bulk electroconvection was shown to develop into a fully fledged flow at nonuniform charge selective solids, specifically on the length scale of surface nonuniformity.

Conclusions:

  • Quiescent electric conduction into uniform charge selective solids is stable with respect to bulk electroconvection.
  • Nonuniformities on charge selective solid surfaces can drive significant bulk electroconvection flows.