Abstract
Simultaneous heat and mass transfer at horizontal cylinder electrodes in free convection has been investigated experimentally using the electrochemical limiting diffusion current technique, in the situation where the concentration and thermal buoyancy effects are opposed. The ferri-ferrocyanide redox system was used for the mass transfer measurements, the electrolyte system being equimolar potassium ferri-ferrocyanide with 0.5 M NaOH as supporting electrolyte. The chosen concentrations were 0.01, 0.02, 0.05, 0.10 and 0.2 M. Two different nickel cylinders of diameter of 33.2 and 21.3 mm were used, each 100 mm in length. The surface temperature of the cylinder varied from 20°C (isothermal) to 85°C. Results for the opposed upward and downward convection was correlated using a combined Grashof number for mass transfer in the range 10 8 < GR m Sc < 10 11. The Schlieren technique of flow visualisation was used for observation of the flow structure.
Published Version
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