Ashworth, Gavin Andrew (1977) Electrochemical capillary gap & pump cells. University of Southampton, Doctoral Thesis.
Abstract
Parameters are investigated which influence the mass transfer and pressure distribution due to radial flow be teen two closely spaced stationary disc electrodes (the capillary gap cell) and for the case when one electrode is rotated (the pump cell).Disc sizes in the range 84 to 230 mm, with various entry diameters were used, interdisc spacir„s un to 0.5 --,n and rotation up to 6000 r'~m.For the capillary gap cell a radial pressure gradient of either sign could be obtained through suitable choice of cell dimensions and flow rates. The occurrence of a reverse transition from turbulent flow with increasing radial ianlacenent and its consequence on mixing properties of fluid within the cell, are discussed. lass transfer diminished towards the nerinhery of the cell and collapsed data shows two distinct flow repines.Rotation of one electrode substantially increased mass transfer towards the perithery of the disc. Reynolds nu^:bers for the radial and tangential flow -,:ere comparable, causing the flow to be under nixed control. In sore uses low pressures close to the cell entry caused a cavitntio- effect; this could be offset b,, increasing the entry diameter. Nass transfer data was collapsed for the range of conditions studied. Pumping power was proportional to W 2P.The porn cell was applied to tae continuous production of dendritic On, Zn and Cuan alloy powder from 10731.1 solution. Fetal ion concentration, _H 3rd potential significantly effected current efficiency which could be 30 - .d'.•tend±.n; on the _metal deposited. Particles of the order of 100 din titer mere nrotuceo.I
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