Electroosmosis is an electro-kinetic phenomenon where bulk solution in the micro-channel moves along the movement of charge towards opposite voltage source (polarity) due to the viscous coupling between moving charge and liquid. The main driving force in electroosmosis is coulomb force exerted on mobile charges. Electroosmotic flow (EOF) is more pronounced in smaller channels, electrical-based system with buffer solution or un-neutralized water. The phenomenon of EOF can also be explained by double layer charge formation. Double layer can be sub-divided into rigid layer and diffuse layer. Unlike rigid layer, diffuse layer has loose cations which moves as soon as the voltage source is applied across, resulting EOF.
In this COMSOL Multiphysics simulation, I have used electroosmosis as wall condition for creeping flow system. This simulation gives useful insights on how the direction and magnitude of flow changes with change in voltage, frequency, time, and electrical properties of the fluid. To learn more about electroosmosis, please read this review paper Electroosmosis — an overview | ScienceDirect Topics
If you are interested in this simulation, please reach me at Kishor Kaphle | LinkedIn or kishor.kaphle@ndus.edu
