Mass transfer in parallel plate electrode cells

Ferreira, Olga Ferraz (1979) Mass transfer in parallel plate electrode cells. University of Southampton, Doctoral Thesis.

Abstract

This thesis describes an investigation of the macroscopic and microscopic environment in parallel plate electrochemical reactors. Measurements of the fluid velocity field and of the distribution of mass transfer were carried out under steady and unsteady conditions. Unsteadiness was achieved, in otherwise laminar flow, by the introduction of vortex generators inside the test section. A laser-Doppler anemometer was used to measure the mean and fluctuating components of local flow velocities. In addition, an array of microelectrodes embedded in the cathode was used to measure local currents, i.e. the local mass transfer coefficients. These techniques permitted the determination of spatial and temporal distributions. The fluctuating signals from the laser-Doppler anemometer and the microelectrodes were processed statistically. Correlation and power spectrum analyses were applied to investigate the mechanisms of mass transfer in the cell, in the presence and absence of vortex generators. The effect of local fluctuations on processes such as metal deposition and organosynthesis are briefly discussed.

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