Mass Transfer in Laminar Flow at a Rotating Disk Electrode in Suspensions of Inert Particles: I . Experimental Investigation on the Influence of the Electrode, the Medium, and the Particle

Abstract

The influence of suspended particles on mass transfer is investigated on the basis of the limiting diffusion current for the reduction of an electroactive species ( or ferricyanide anion) over a wide range of rotation speeds Ω and for numerous parameters inherent in the RDE (nature, roughness, electric charge, diameter), the medium (diffusing species, viscosity, temperature), and the particle (nature, size, volume concentration, size distribution). Contrarily to the one‐phase medium (the supernatant), for which a single straight line is observed in vs. coordinates, the suspended particles give rise to four, three, or two linear sections whose slopes and transition speeds depend on the various parameters investigated. The influence of each of the parameters is shown to be closely related to those of the others.