Analysis of convective mass transfer by potential relaxation

A noncontact experimental method for determining mass-transfer boundary layer thicknesses in electrochemical systems has been examined. The technique is based on the premise that the relaxation in concentration overpotential after current interruption is an accurate measure of liquid-phase mass-tran...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1989-06, Vol.136:6
Main Authors: Anantharaman, V., Pintauro, P.N., Nanis, L.
Format: Article
Language:English
Subjects:
30 DIRECT ENERGY CONVERSION
300505 - Fuel Cells- Electrochemistry, Mass Transfer & Thermodynamics
400400 - Electrochemistry
BOUNDARY LAYERS
CATHODES
CHEMICAL COMPOSITION
CHEMISTRY
CONVECTION
COPPER
CORRELATIONS
CURRENT DENSITY
DATA
DIMENSIONS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
ELEMENTS
ENERGY TRANSFER
EXPERIMENTAL DATA
FLUIDS
GRASHOF NUMBER
HEAT TRANSFER
INFORMATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LAYERS
LIQUIDS
MASS TRANSFER
METALS
NATURAL CONVECTION
NUMERICAL DATA
PHASE STUDIES
THICKNESS
TRANSITION ELEMENTS
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Summary:A noncontact experimental method for determining mass-transfer boundary layer thicknesses in electrochemical systems has been examined. The technique is based on the premise that the relaxation in concentration overpotential after current interruption is an accurate measure of liquid-phase mass-transfer resistance. Experimental overpotential decay data were fitted to a theoretical surface concentration decay model. Boundary layer thicknesses were determined by matching the real time scale of the experimental data and the dimensionless time scale of the theoretical analysis. Over potential relaxation experiments were performed at a vertical flat plate copper cathode with natural convection stirring. The effects of electrode height, current density, and electrolyte composition on mass-transfer boundary layer thicknesses were examined and correlated. The results are presented.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2097000