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Electrochemical mass transfer at a fixed bed of spheres under forced convection induced by counterelectrode gas bubbles

1986; Wiley; Volume: 64; Issue: 1 Linguagem: Inglês

10.1002/cjce.5450640111

1939-019X

G.H. Sedahmed,

Metallurgical Processes and Thermodynamics

Abstract Rates of mass transfer were measured at a cathode consisting of a fixed single layer of spheres stirred by oxygen evolved at a horizontal disc anode placed below. The rate of mass transfer was found to increase by a factor of 2–6.5 over the natural convection value, depending on the operating conditions. A mathematical model based on the surface renewal theory was formulated to explain the mechanism of mass transfer at gas stirred electrodes. A new electrochemical reactor built of a series of cells arranged vertically in a cylindrical container, each cell consisting of a screen gas‐evolving counterelectrode placed below a fixed bed working electrode, is proposed as offering an efficient way of stirring with no external stirring power consumption.