The enhancing effect of gas bubbles generated at an anode, on the ionic mass transport rate at the associated cathode is analysed by means of an experimental laboratory-scale copper electrowinning cell in which the bubbles were (a) permitted to rise freely in the entire cell and (b) restricted in their motion by a copper baffle-plate placed between the two electrodes. The improvement in mass transfer observed in the unrestricted case has been correlated via statistical regression analysis to the intensity of bubble motion and pertinent cell parameters.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
- b :
Distance of anode-cathode separation; m
- D :
Electrolyte diffusivity, m2 s−1
- D e :
Cell equivalent diameter; m
- F :
Faraday constant; 9.6487×104C mol−1
- g :
Acceleration due to gravity, m s−2
- h :
Active electrode height, m
- i :
Limiting current density; Ī average limiting current density; Am−2
- L :
Electrode width, m
- n a :
Number of electrons involved in the anode reaction for production of one mole of gas
- p a :
Atmospheric pressure, Pa
- Q :
Volumetric gas bubble rate, m3 s−1
- (Re g):
Gas-phase Reynolds number defined in Equation 4
Schmidt number; (Sc)=vD −1
Sherwood number; (Sh)=ih/n c FDc o;n c number of electrons involved in cathode reaction,c 0 bulk electrolyte concentration, mol m−3
- T :
Electrolyte temperature, K
- Z :
Co-ordinate along electrode height, m
- α, Β, γ :
Regression coefficients in Equation 5
- v :
Electrolyte kinematic diffusivity, m2s−1
Denotes experimental conditions where the electrodes are separated by a conducting baffle-plate
N. Ibl,Chem.-Ing.-Tech. 43 (1971) 202.
I. Roušar, V. Cezner,Electrochim. Acta 20 (1975) 289.
Idem ibid,20 (1975) 294.
W. W. Harvey, M. R. Randlett and K. I. Bangenskis, Paper presented at the 102nd AIME meeting, Chicago, (1973).
V. A. Ettel, B. V. Tilak and A. S. Gendron,J. Electrochem. Soc. 121 (1974) 867.
D. J. Pickett and B. R. Stanmore,J. Appl. Electrochem. 2 (1972) 151.
R. G. Deissler,NACA Technical Note (1954) 3145.
T. K. Sherwood,Chem. Eng. Progr., Symp. 55 (1959) 71.
About this article
Cite this article
Mohanta, S., Fahidy, T.Z. The effect of anodic bubble formation on cathodic mass transfer under natural convection conditions. J Appl Electrochem 7, 235–238 (1977). https://doi.org/10.1007/BF00618990
- Mass Transfer
- Mass Transport
- Natural Convection
- Transport Rate