Abstract
Experimental studies of a simple unipolar electrophoretic flow have revealed that, typically, between 10% and 25% of the electrical energy supplied was usefully converted into flow work. Certain experimental uncertainties prevent firm conclusions, but two mechanisms have been proposed to explain low mass transfer efficiency; (i) space charge effects at the collector which reduces the intensity of the 'useful' electric field in the region of the bulk flow and (ii) microscopic shear dissipation arising from the disperse nature of the electrophoretic point forces. The single streamer flows were generated in n-hexane by the localised injection of charge from discs of ion-exchange resin in a parallel plate electrode system. The mass transfer data were collected using a frequency shifted, purpose built laser Doppler anemometer employing specially developed polymethylmethacrylate light-scattering seed particles. Measured velocity profiles within the flow structure provided estimates of mass transfer efficiency at applied field strengths up to 3.75*104 V m-1.
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