Journal article

Effect of wall permittivity on electroviscous flow through a contraction

JD Berry, MR Davidson, RP Bharti, DJE Harvie

Biomicrofluidics | AMER INST PHYSICS | Published : 2011

Abstract

The electroviscous flow at low Reynolds number through a two-dimensional slit contraction with electric double-layer overlap is investigated numerically for cases where the permittivity of the wall material is significant in comparison with the permittivity of the liquid. The liquid-solid interface is assumed to have uniform surface-charge density. It is demonstrated that a finite wall permittivity has a marked effect on the distribution of ions in and around the contraction, with a significant build-up of counter-ions observed at the back-step. The development length of the flow increases substantially as the wall permittivity becomes significant, meaning that the electric double-layers req..

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