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Controlling turbulent drag across electrolytes using electric fields

Abstract

Reversible in operando control of friction is an unsolved challenge crucial to industrial tribology. Recent studies show that at low sliding velocities, this control can be achieved by applying an electric field across electrolyte lubricants. However, the phenomenology at high sliding velocities is yet unknown. In this paper, we investigate the hydrodynamic friction across electrolytes under shear beyond the transition to turbulence. We develop a novel, highly parallelised, numerical method for solving the coupled Navier-Stokes Poisson-Nernest-Planck equation. Our results show that turbulent drag cannot be controlled across dilute electrolyte using static electric fields alone. The limitations of the Poisson-Nernst-Planck formalism hints at ways in which turbulent drag could be controlled using electric fields.

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Publication details

The article was accepted on 21 Dec 2016 and first published on 19 Jan 2017


Article type: Paper
DOI: 10.1039/C6FD00247A
Citation: Faraday Discuss., 2017, Accepted Manuscript
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    Controlling turbulent drag across electrolytes using electric fields

    R. Ostilla-Monico and A. Lee, Faraday Discuss., 2017, Accepted Manuscript , DOI: 10.1039/C6FD00247A

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