Mass Transfer at the Confining Wall of an Electrochemical Cell in the Presence of Twisted Tapes
The IUP Journal of Chemical Engineering, Vol. III, No. 1, pp. 23-34, March 2011
Posted: 4 Jul 2011
Date Written: July 4, 2011
Mass transfer coefficients between a liquid and column wall of an electrochemical cell were computed from the limiting current measurements made at the point electrodes fixed flush with the inner surface of the column wall. Twisted tapes of varying width and pitch served as insert promoter elements. The employed test section, which acted as electrochemical cell, consisted of a perspex tube of 6.73 cm inner diameter. 34 point electrodes were fixed to the test section. The liquid used was an electrolyte belonging to the Ferri-Ferrocyanide redox system. Addition of Carboxy Methyl Cellulose (CMC) sodium sulphate increased the viscosity of the solution. Analysis of the data obtained revealed that an increase in tape width increased the mass transfer coefficient. A decrease in mass transfer coefficient was observed with increase in tape pitch and CMC concentration. The data were correlated using regression analysis.
Keywords: Liquid-wall mass transfer, Ionic mass transfer, Twisted tape, Turbulent promoter
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