Fig. 4
From: Enhanced voltage generation through electrolyte flow on liquid-filled surfaces
Parametrization and modeling of charged fluid–solid surfaces. a The surface charge density (σ) of an air-filled surface (AFS) varies between zero (at the air) and a finite value at the solid, while a nominally planar liquid-filled surface (LFS) maintains a larger value of the σ . The electrokinetics on the LFS was considered in terms of a superposition of b hydrodynamic flow, with fluid slip over electrically neutral surfaces, and c an electrokinetic flow, with no-slip fluid flow over electrically charged surfaces, and solving the coupled Nernst–Planck–Poisson (NPP) equation along with the Stokes Equation to determine the d velocity profile, as well as the volumetric charge density (ρ) profiles. The insets indicate the computed variation of the ρ at the top poly-dimethyl siloxane (PDMS) surface and the bottom LFS
