Abstract
Electrodialysis using ion-exchange membranes is a means of producing dilute and condensate under the influence of an applied electric potential difference of saltwater. In this study, we have investigated the transport process of ions in the electrodialysis stack under the influence of an applied electric field. Under a limiting current density, the ion concentration totally vanishes at the exit of the diluate channel so that the electric resistance goes infinity toward the diluate side of the cation exchange membrane, which is referred to as concentration polarization. The effect of the flow field on this limiting current density, which is one of the most important design parameters in the electrodialysis stacks, have been investigated by measurement of the electric resistance and concentration.
