Collect. Czech. Chem. Commun. 1997, 62, 397-419

Dynamics of Electrodiffusion Friction Probes. I. Shape-Dependent Potentiostatic Transient

Ondřej Wein and Václav Sobolík

Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic,165 02 Prague 6-Suchdol, Czech Republic


An exact theory is given of the voltage-step transient under limiting diffusion conditions for an electrodiffusion friction probe of arbitrary convex shape. The actual transient courses are given for the strip, circular, elliptic, triangular, and rectangular probes of any orientation with respect to the flow direction. A simple formula for any probe with a single working electrode of convex shape is suggested to facilitate the calibration of electrodiffusion probes based on the voltage-step transient.

Keywords: Unsteady diffusion layer; Limiting diffusion current; Wall shear rate.