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Título:
Electrodeposition in highly viscous media: Experiments and Simulations
Autor/es:
S. GUTMAN, G. DIAZ CONSTANZO, A. SOBA, G.A. GONZÁLEZ, G. MARSHALL
Lugar:
Argentina
Reunión:
Simposio; ISEHD2006 International Symposium of Electrohidrodinamic; 2006
Institución organizadora:
IEEE
Resumen:
AbstractElectrolyte viscosity plays an important role in ion
transport. Here we study the effects of high viscosity variations in
thin-layer electrochemical deposition (ECD) under galvanostatic
conditions through experimental measurements and theoretical
modelling. The viscosity was varied through glycerol and polymer
additions and the tracking of convective fronts was performed
through the use of optical and particle image velocimetry
techniques with micron sized particles. The theoretical model,
written in terms of dimensionless quantities, describes diffusive,
migratory and convective ion transport in a fluid under galvanostatic
conditions. Experiments reveal that as viscosity increases,
convection decreases, while concentration gradients increase.
These effects are more pronounced when the current increases.
Theory and simulations predict that as viscosity increases, the
Poisson and Reynolds numbers decrease whereas the Peclet and
electric Grashof numbers increase. Therefore, electroconvection
becomes more relevant.