Electro-osmoticallv induced convection at a charge-selective membrane

摘要

The paper is concerned with convection induced by nonequilibrium elec-troosmosis at an ion exchange electrodialysis membrane, as a source of overlimiting conductance through the membrane. Derivation of nonequilibrium electroosmotic slip condition is recapitulated along with the results of linear stability analysis of quiescent electrodiffusion through a fiat ion exchange membrane. Results of numerical calculation pertaining to nonlinear convection, developing from the respective instability, are reported along with those of recent experiments with modified membranes. These latter rule in favor of surface versus bulk origin of overlimiting conductance through ion exchange membranes.