Electrolytic mass transport at a rotating outer cylinder electrode with developing axial flow in the annulus

Mass transport in an experimental horizontal electrochemical reactor with a rotating outer cylinder and axial flow in the annulus has been investigated, and appropriate dimensionless relationships for the estimation of mass transport rates have been developed by employing statistical regression analysis of experimentally measured flow rates and current density.Nomenclature c_O active ion concentration in electrolyte bulk - c_a supporting electrolyte concentration in electrolyte bulk - D electrolyte diffusivity - d_e equivalent diameter - F Faraday's constant - I electric current - i_c cathodic current density - Nu Nusselt number - L electrode length - Pe Peclet number (Re ·Sc) - R₁ inner cylinder radius (outer) - R₂ outer cylinder radius (inner) - R² square of the multiple correlation coefficient - Re Reynolds number (2(R₂–R₁)/v) - Sc Schmidt number (v/D) - Sh Sherwood number (2i_c(R₂–R₁)/zFDc_o) - Ta_m modified Taylor number (R₂(R₂–R₁^3/2/vR₁^1/2) - axial electrolyte velocity - z valency (z=2 in the current case) - v electrolyte kinematic viscosity - rotation speed