Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session D07: Electrokinetics: General
2:30 PM–4:40 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B212
Chair: William Ristenpart, University of California, Davis
Abstract ID: BAPS.2018.DFD.D07.5
Abstract: D07.00005 : Electrokinetic flows and energy conversion in nanofluidic channels: Assessing continuum predictions via molecular dynamics*
3:22 PM–3:35 PM
Presenter:
Carlos E Colosqui
(State Univ of NY - Stony Brook)
Authors:
Carlos E Colosqui
(State Univ of NY - Stony Brook)
Amir M. Rahmani
(State Univ of NY - Stony Brook)
Antonio Checco
(State Univ of NY - Stony Brook)
The flow of electrolyte solutions in nanoscale channels can convert mechanical forces into electrical power. High efficiencies (> 50%) are predicted by the classical Poisson-Boltzmann and Navier-Stokes equations. Employing molecular dynamics (MD) we assess the accuracy of such continuum-level descriptions for slit channels with small nanoscale heights (h ∼ 10 nm) where there is significant overlap of the electric double layers at the wall-fluid interface. We study nanochannels with atomically smooth surfaces and periodic geometric features. The hydrodynamic slip length and ion solvation energy are varied over a moderate range, which is found to significantly affect the nanochannel hydrodynamic and electrical resistance, and thus the conversion efficiency. Despite steric effects, nanoscale hydration layers, and localized charge heterogeneities, the employed continuum model predicts with reasonable accuracy electrokinetic coupling coefficients and conversion efficiencies from MD simulations. Our results support the application of conventional continuum descriptions with minor modifications to design nanofluidic devices for electrokinetic energy conversion with high efficiencies.
*This work is supported by the Office of Naval Research under Award No. N00014-16-1-3178
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D07.5
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