Mass transfer in fluidized beds of inert particles. Part I: The role of collision currents in mass transfer to the electrode

The effect of particle-wall collision on the mass transfer rate mechanism i n liquid fluidized bed electrochemical cells was studied. Collision frequen cies and currents were measured at microelectrodes set in the bed wall. It is postulated that, at each particle-electrode collision, a specific microv olume of bulk concentration electrolyte is introduced into the near-electro de diffusion layer during particle movement towards the electrode causing a n enhancement of the limiting diffusion current. Based on measurements made at microelectrodes calculations of the contribution of the particle collis ion mechanism to total mass transfer to a planar electrode are attempted an d are in good agreement with experimental values.