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Hydrodynamic transfer function associated to a Rotating Disk Electrode in the presence of a viscosity gradient

doi: 10.6062/jcis.2013.04.01.0067


N.A. Leite, O.E. Barcia, O.R. Mattos, J. Pontes and N. Mangiavacchi


This work investigates the behaviour of the hydrodynamic transfer function of Rotating Disk Electrode (RDE) obtained with the hydrodynamic and mass transfer equations coupled through the dependency of the viscosity on the concentration of a chemical species in the electrolyte, which originates from the dissolution of iron electrodes in the 1MH2SO4 electrolyte solution. The results are compared with those obtained for constant viscosity and for the case where a viscosity profile depending on the distance to the electrode surface is imposed, decoupling the hydrodynamic and mass transfer equations. The results show that the existence of a viscosity gradient in the neighborhood of the RDE affects the hydrodynamic transfer function and changes increase with the increase of the perturbation frequency imposed to the angular velocity of the electrode. The coupling between the concentration and the hydrodynamic fields introduces a dependency of the transfer function on the Schmidt number. And higher viscosity gradients, or Schmidt numbers reduce the phase angle delay of the transfer function for a given perturbation frequency p, in comparison with systems with constant viscosity.


corrosion, electro-hydrodynamic impedance, rotating disk electrode.


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