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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Equilibrium electroconvective instability.

I Rubinstein1, B Zaltzman1

  • 1Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben-Gurion 84993, Israel.

Physical Review Letters
|April 4, 2015
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Summary
This summary is machine-generated.

Hydrodynamic instability in concentration polarization can arise from equilibrium electroconvection, not just nonequilibrium electro-osmosis. Relaxing perfect charge selectivity reveals this equilibrium mechanism, offering a new experimental test.

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Area of Science:

  • Electrochemistry
  • Fluid Dynamics
  • Surface Science

Background:

  • Hydrodynamic instability in concentration polarization at charged interfaces is typically attributed to nonequilibrium electro-osmosis.
  • Previous models assumed perfect charge selectivity, limiting the understanding of instability mechanisms.
  • Neither equilibrium electro-osmosis nor bulk electroconvection were thought to cause instability in perfectly selective solids.

Purpose of the Study:

  • To investigate the role of non-perfect charge selectivity in hydrodynamic instability at charged interfaces.
  • To explore the possibility of equilibrium electroconvective instability.
  • To propose an experimental method for distinguishing between equilibrium and nonequilibrium instability origins.

Main Methods:

  • Theoretical analysis of hydrodynamic instability at a charge-selective interface.
  • Relaxing the assumption of perfect charge selectivity in theoretical models.
  • Analyzing the conditions for equilibrium electroconvective instability.

Main Results:

  • Relaxing the assumption of perfect charge selectivity allows for equilibrium electroconvective instability.
  • This finding challenges the long-held attribution of instability solely to nonequilibrium electro-osmosis.
  • A simple experimental test is proposed to differentiate between equilibrium and nonequilibrium origins.

Conclusions:

  • Hydrodynamic instability in concentration polarization can be driven by equilibrium electroconvection.
  • The degree of charge selectivity at the interface is crucial in determining the instability mechanism.
  • Further experimental validation is needed to confirm the proposed instability mechanisms and diagnostic test.