Vibratory Agitation to Enhance Mass Transfer in Electrodeposition
Abstract
A study has been carried out employing a vibratory motor, offering amplitudes of 0·4–4 mm at 50 Hz in acid copper sulphate as a model electrolyte in which α‐Al2O3 particles are suspended for co‐deposition, yielding a composite electrodeposit. Using a horizontal disc vibrator at the bottom of the container, perforated discs have been shown to give superior agitation and a laminar/turbulent transition has been identified. Incorporation of particles is a maximum at the transition. In the laminar regime Sh‐Re0·037 and in the turbulent regime Sh‐Re0·82. Mass transport enhancement was measured for a variety of disc and tank diameters and enhancement factors for electrodeposition of 3–40 times were obtained. In these circumstances a modified Reynolds number Re1 was employed Re1 = 100 ad2(d1−d2)/υd2 and, assuming a conventional dependence upon Sc, a full correlation of the type Sh1 = constant Re1a Sc0·33 was obtained where the constant took values of 10–40 and ‘a’ took values of 0·83–1·1 depending upon precise location within the tank of the mass transfer probe.
Citation
Kalantary, M.R., Amadi, S.A. and Gabe, D.R. (1989), "Vibratory Agitation to Enhance Mass Transfer in Electrodeposition", Circuit World, Vol. 15 No. 4, pp. 39-42. https://doi.org/10.1108/eb044008
Publisher
:MCB UP Ltd
Copyright © 1989, MCB UP Limited