MASS-TRANSFER RATES IN AN ELECTROCHEMICAL-CELL

Local mass transfer conditions in an electrochemical cell were obtained at various spatial locations with turbulence created by electrolyte circulation, or by an impeller, or by employing both simultaneously. For the cell with electrolyte circulation both the limiting current density and mass transfer coefficient varied with the cathode heights and three zones for their distribution in the cell were obtained. An empirical equation correlating mass transfer coefficient with residence time is proposed. The mass transfer coefficient has been correlated with specific power. Three hydrodynamic zones were also obtained where the turbulence was created by an impeller. An equation for correlating the mass transfer coefficient with the impeller speed is suggested.