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Electrochemical mass transfer at a fixed bed of spheres under forced convection induced by counterelectrode gas bubbles
Author(s) -
Sedahmed G. H.
Publication year - 1986
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450640111
Subject(s) - mass transfer , anode , cathode , electrochemistry , spheres , natural convection , convection , materials science , mechanics , electrode , thermodynamics , container (type theory) , heat transfer , analytical chemistry (journal) , chemistry , composite material , chromatography , physics , astronomy
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.