MASS-TRANSFER AT ROTATING CONE ELECTRODES

Upright and inverted rotating cone electrodes (apex half angle 52-degrees) have been studied using electro-deposition of copper from an acid electrolyte (Sc = 1770) by means of limiting current mass transport techniques. The behaviour suggests that it is appropriate to regard these electrodes as modified disc electrodes. The upright rotating cone electrode exhibits a flow transition at Re = 1 x 10(5). In laminar flow Sh = 4.5Re0.48 and in turbulent flow Sh = 0.04Re0.95. The inverted rotating cone electrode exhibits a flow transition at Re = 6 x 10(4). In laminar flow Sh = 4.5Re0.45 and in turbulent flow Sh = 0.04Re0.88. The data have been interpreted in terms of a coating thickness affected by throwing power effects and the use of a conical cathode cell for control of high speed electrodeposition processes is indicated.