WIAS Preprint No. 2525, (2018)

Models and numerical methods for electrolyte flows



Authors

  • Fuhrmann, Jürgen
  • Guhlke, Clemens
  • Linke, Alexander
    ORCID: 0000-0002-0165-2698
  • Merdon, Christian
  • Müller, Rüdiger
    ORCID: 0000-0003-2643-722X

2010 Mathematics Subject Classification

  • 35Q35 35Q61 78A57 80A17

Keywords

  • Electro-thermodynamics, electroosmosis, ion transport, finite ion size, solvation

DOI

10.20347/WIAS.PREPRINT.2525

Abstract

The most common mathematical models for electrolyte flows are based on the dilute solution assumption, leading to a coupled system of the Nernst--Planck--Poisson drift-diffusion equations for ion transport and the Stokes resp. Navier--Stokes equations for fluid flow. This contribution discusses historical and recent model developments beyond the dilute solution assumption and focuses on the effects of finite ion sizes and solvation. A novel numerical solution approach is presented and verified here which aims at preserving on the discrete level consistency with basic thermodynamic principles and structural properties like independence of flow velocities from gradient contributions to external forces.

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