Related Experiment Video
Updated: May 6, 2026

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
Published on: September 7, 2018
Ionic flows through a single homogeneous membrane : A thermodynamic analysis
1Institute of Physiology, Aarhus University, Aarhus, Denmark.
Abstract:
The Kedem-Katchalsky equation for the flow of a mono-monovalent salt through a highly charged permselective membrane is given as a first order expansion of a single integral of the Kirkwood-Bearman-Spiegler equations. The integration is performed under the assumption that the partial frictional coefficientsζ ij are concentration independent. Conditions for the validity of the expansion are presented. A close relationship to the Goldman equation is demonstrated. If impermeable salts are present in the bathing solutions, the Kedem-Katchalskypractical parameters ω, σ, and τ1 may be ill-defined. Nevertheless, an ionic flow equation of similar form, but of significant difference, can be derived for this situation. The Kedem-Katchalsky equation for salt flow is a special case of this more general equation.
More Related Videos
08:06Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
Published on: February 23, 2017
10:19Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing
Published on: February 13, 2016
Related Concept Videos
Steady, Laminar Flow Between Parallel Plates
Couette Flow
Irrotational Flow
Steady Flow of a Fluid Stream
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
Steady, Laminar Flow in Circular Tubes
Equation of Continuity