Figure 2.

Salt concentration and electrostatic potential across an unimpeded pore of aspect ratio w=a∕d=0.1. (a) The salt density Σ(ξ) as a function of the axial coordinate for various EOF velocities U and salt ratio Σ_L=3. (b) The normalized potential Φ(ξ)∕V for various salt ratios Σ_L. The flat segments in both plots correspond the hemispherical cap regions in which all quantities are approximated as constant. The errors introduced in the quantities outside the caps with such an approximation are of order w².