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Electrokinetics meets electrohydrodynamics

Published online by Cambridge University Press:  30 September 2015

Martin Z. Bazant
Martin Z. Bazant*
Affiliation:
Departments of Chemical Engineering and Mathematics, Massachusetts Institute of Technology, MA, USA
*
†Email address for correspondence: bazant@mit.edu
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Abstract

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Despite studying the same subject – electrically induced flow – the fields of electrokinetics (EK) and electrohydrodynamics (EHD) have developed separately, for different types of fluids and interfaces. In colloids or porous media, EK phenomena derive from the electro-osmotic slip of a liquid electrolyte across the neutral electric double layer on a solid surface. On the other hand, EHD phenomena involve poorly conducting neutral fluids and solids, whose interfaces acquire net charge in response to electric fields. Over the past decade, combined theories of EK and EHD have emerged for fluid/solid interfaces, and now Schnitzer & Yariv (J. Fluid Mech., vol. 773, 2015, pp. 1–33) have taken a major step towards unifying EK and EHD for fluid/fluid interfaces. Following previous work by Baygents and Saville, they derive the classical Taylor–Melcher model of droplet EHD as the large-field thin-double-layer limit of the electrokinetic equations, thus elucidating the ubiquitous ‘leaky dielectric’ approximation. Future work could consider the secondary electro-osmotic flow and electrophoretic motion of the drop (neglected here as small perturbations) and allow for more general EK models.

JFM classification

Drops and Bubbles: Drops and Bubbles Drops and Bubbles: Electrohydrodynamic effects

Information

Type
Focus on Fluids
Information
Journal of Fluid Mechanics , Volume 782 , 10 November 2015 , pp. 1 - 4
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Copyright
© 2015 Cambridge University Press 

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