Hydrodynamic actions leading to the electrodeposition of AuCu/B4C composites have been investigated experimentally and theoretically. Translation and rotation of cylindrical cathodes have been studied. Embedding of particles into disk electrodes rotating at various speeds has been analysed. The dependence of volume fraction of embedded particles on fluidisation conditions has been investigated. Higher volume fractions correlate with higher mass transport rate to the cathode and are found in points on which flow lines are closer to normal to the cathode surface (stagnation points), irrespectively of the overall flow sign. Hydrodynamic classification of particles diameters has also been observed: lower fluidisation velocities and tangential (to cathode surface) fluid flow components correlate with larger particles whilst higher fluidisation velocities and normal fluid flow components correlate with smaller particles. These effects have been modelled analytically on the basis of a hydrodynamic treatment of interactions among fluid flow, electrode surface and particles. Effects of the cathode roughness - and related local flow conditions - on particle embedding have also been disclosed and explained with the above-mentioned hydrodynamic model. (C) 2000 Elsevier Science Ltd. All rights reserved.
Hydrodynamic problems related to the electrodeposition of AuCu/B4C composites / Benedetto, Bozzini; Bruno, Brevaglieri; Pietro Luigi, Cavallotti; Giuseppe, Giovannelli; Natali, Stefano. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - 45:20(2000), pp. 3431-3438. (Intervento presentato al convegno 50th Annual Meeting of the International-Society-of-Electrochemistry (ISE) tenutosi a PAVIA, ITALY nel SEP 05-10, 1999) [10.1016/s0013-4686(00)00441-2].
Hydrodynamic problems related to the electrodeposition of AuCu/B4C composites
NATALI, Stefano
2000
Abstract
Hydrodynamic actions leading to the electrodeposition of AuCu/B4C composites have been investigated experimentally and theoretically. Translation and rotation of cylindrical cathodes have been studied. Embedding of particles into disk electrodes rotating at various speeds has been analysed. The dependence of volume fraction of embedded particles on fluidisation conditions has been investigated. Higher volume fractions correlate with higher mass transport rate to the cathode and are found in points on which flow lines are closer to normal to the cathode surface (stagnation points), irrespectively of the overall flow sign. Hydrodynamic classification of particles diameters has also been observed: lower fluidisation velocities and tangential (to cathode surface) fluid flow components correlate with larger particles whilst higher fluidisation velocities and normal fluid flow components correlate with smaller particles. These effects have been modelled analytically on the basis of a hydrodynamic treatment of interactions among fluid flow, electrode surface and particles. Effects of the cathode roughness - and related local flow conditions - on particle embedding have also been disclosed and explained with the above-mentioned hydrodynamic model. (C) 2000 Elsevier Science Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
