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Karatay E, Andersen MB, Wessling M, et al. Coupling between Buoyancy Forces and Electroconvective Instability near Ion-Selective Surfaces. Phys Rev Lett. 2016;116(19):194501doi: 10.1103/PhysRevLett.116.194501.
Karatay, E., Andersen, M. B., Wessling, M., & Mani, A. (2016). Coupling between Buoyancy Forces and Electroconvective Instability near Ion-Selective Surfaces. Physical review letters, 116(19), 194501. https://doi.org/10.1103/PhysRevLett.116.194501
Karatay, Elif, et al. "Coupling between Buoyancy Forces and Electroconvective Instability near Ion-Selective Surfaces." Physical review letters vol. 116,19 (2016): 194501. doi: https://doi.org/10.1103/PhysRevLett.116.194501
Karatay E, Andersen MB, Wessling M, Mani A. Coupling between Buoyancy Forces and Electroconvective Instability near Ion-Selective Surfaces. Phys Rev Lett. 2016 May 13;116(19):194501. doi: 10.1103/PhysRevLett.116.194501. Epub 2016 May 12. PMID: 27232024.
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Phys Rev Lett. 2016 May 13;116(19):194501. doi: 10.1103/PhysRevLett.116.194501. Epub 2016 May 12.

Coupling between Buoyancy Forces and Electroconvective Instability near Ion-Selective Surfaces.

Physical review letters

Elif Karatay, Mathias Bækbo Andersen, Matthias Wessling, Ali Mani

Affiliations

  1. Department of Mechanical Engineering, Stanford University and Center for Turbulence Research, Stanford University, Stanford, California 94305, USA.
  2. RWTH Aachen University, Aachener Verfahrenstechnik, 52056 Aachen, Germany.

PMID: 27232024 DOI: 10.1103/PhysRevLett.116.194501

Abstract

Recent investigations have revealed that ion transport from aqueous electrolytes to ion-selective surfaces is subject to electroconvective instability that stems from coupling of hydrodynamics with electrostatic forces. These systems inherently involve fluid density variation set by salinity gradients. However, the coupling between the buoyancy effects and electroconvective instability has not yet been investigated although a wide range of electrochemical systems are naturally prone to these interplaying effects. In this study we thoroughly examine the interplay of gravitational convection and chaotic electroconvection. Our results reveal that buoyant forces can significantly influence the transport rates, otherwise set by electroconvection, when the Rayleigh number Ra of the system exceeds a value Ra∼1000. We show that buoyancy forces can significantly alter the flow patterns in these systems. When the buoyancy acts in the stabilizing direction, it limits the extent of penetration of electroconvection, but without eliminating it. When the buoyancy destabilizes the flow, it alters the electroconvective patterns by introducing upward and downward fingers of respectively light and heavy fluids.

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