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Mass transfer at vertical cylinders under forced convection induced by the counter electrode gases

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Abstract

Mass transfer coefficients were measured for the deposition of copper from acidified copper sulphate solution at a vertical cylinder cathode stirred by oxygen evolved at a horizontal lead anode placed below the cylinder. Variables studied were: oxygen discharge rate, electrolyte concentration and cylinder height. The mass transfer coefficient was found to increase by a factor of 1.8–2.6 depending on oxygen discharge rate and cylinder height. The mass transfer coefficient was related to oxygen discharge rate and cylinder height by the equation:

$$K = 65.8 \times 10^{ - 4} \frac{{V^{0.358} }}{{h^{0.29} }}$$

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Abbreviations

K :

mass transfer coefficient (cm s−1)

V :

oxygen discharge rate (cm3 cm−2 s−1)

I :

limiting current (A cm−2)

i :

anodic current density (A cm−2)

Z :

number of electrons involved in the reaction

F :

Faraday's constant

h :

electrode height (cm)

R :

gas constant

T :

temperature (K)

A :

anode area (cm2)

P :

oxygen pressure (atm)

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Authors and Affiliations

  1. Chemical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt

    G. H. Sedahmed

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  1. G. H. Sedahmed
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Sedahmed, G.H. Mass transfer at vertical cylinders under forced convection induced by the counter electrode gases. J Appl Electrochem 10, 351–355 (1980). https://doi.org/10.1007/BF00617210

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