Abstract
The convective diffusion problem near small electrodes is solved numerically using finite volume method (direct problem). The results obtained are first used to define the limits of the quasi-steady state Leveque solution for a rectangular and circular probe. After, the algorithm is integrated to an inverse sequential method in order to obtain the wall shear rate from the measurements of the limiting diffusion currents. The results are compared with the classical techniques of calculation of wall shear rate as the quasi-steady solution, transfer function methods and the Leveque solution with transient correction.