Low Mach number fluctuating hydrodynamics model for ionic liquids
Abstract
We present a new mesoscale model for ionic liquids based on a low Mach number fluctuating hydrodynamics formulation for multicomponent charged species. The low Mach number approach eliminates sound waves from the fully compressible equations leading to a computationally efficient incompressible formulation. The model uses a Gibbs free energy functional that includes enthalpy of mixing, interfacial energy, and electrostatic contributions. These lead to a new fourth-order term in the mass equations and a reversible stress in the momentum equations. We calibrate our model using parameters for [DMPI+][F6P-], an extensively-studied room temperature ionic liquid (RTIL), and numerically demonstrate the formation of mesoscopic structuring at equilibrium in two and three dimensions. In simulations with electrode boundaries the measured double layer capacitance decreases with voltage, in agreement with theoretical predictions and experimental measurements for RTILs. Finally, we present a shear electroosmosis example to demonstrate that the methodology can be used to model electrokinetic flows.
- Authors:
-
[1];
[1];
[1];
[2];
[3]
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of California, Los Angeles, CA (United States)
- San Jose State Univ., CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- OSTI Identifier:
- 1670129
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Fluids (Online)
- Additional Journal Information:
- Journal Name: Physical Review Fluids (Online); Journal Volume: 5; Journal Issue: 9; Journal ID: ISSN 2469-990X
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Klymko, Katherine, Nonaka, Andrew, Bell, John B., Carney, Sean P., and Garcia, Alejandro L. Low Mach number fluctuating hydrodynamics model for ionic liquids. United States: N. p., 2020.
Web. doi:10.1103/physrevfluids.5.093701.
Klymko, Katherine, Nonaka, Andrew, Bell, John B., Carney, Sean P., & Garcia, Alejandro L. Low Mach number fluctuating hydrodynamics model for ionic liquids. United States. https://doi.org/10.1103/physrevfluids.5.093701
Klymko, Katherine, Nonaka, Andrew, Bell, John B., Carney, Sean P., and Garcia, Alejandro L. Fri .
"Low Mach number fluctuating hydrodynamics model for ionic liquids". United States. https://doi.org/10.1103/physrevfluids.5.093701. https://www.osti.gov/servlets/purl/1670129.
@article{osti_1670129,
title = {Low Mach number fluctuating hydrodynamics model for ionic liquids},
author = {Klymko, Katherine and Nonaka, Andrew and Bell, John B. and Carney, Sean P. and Garcia, Alejandro L.},
abstractNote = {We present a new mesoscale model for ionic liquids based on a low Mach number fluctuating hydrodynamics formulation for multicomponent charged species. The low Mach number approach eliminates sound waves from the fully compressible equations leading to a computationally efficient incompressible formulation. The model uses a Gibbs free energy functional that includes enthalpy of mixing, interfacial energy, and electrostatic contributions. These lead to a new fourth-order term in the mass equations and a reversible stress in the momentum equations. We calibrate our model using parameters for [DMPI+][F6P-], an extensively-studied room temperature ionic liquid (RTIL), and numerically demonstrate the formation of mesoscopic structuring at equilibrium in two and three dimensions. In simulations with electrode boundaries the measured double layer capacitance decreases with voltage, in agreement with theoretical predictions and experimental measurements for RTILs. Finally, we present a shear electroosmosis example to demonstrate that the methodology can be used to model electrokinetic flows.},
doi = {10.1103/physrevfluids.5.093701},
journal = {Physical Review Fluids (Online)},
number = 9,
volume = 5,
place = {United States},
year = {Fri Sep 18 00:00:00 EDT 2020},
month = {Fri Sep 18 00:00:00 EDT 2020}
}
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