Abstract
The flow field in front of and around hydrogen- or oxygen-evolving electrodes of different shapes has been investigated by Laser-Doppler anemometry. A strong influence of geometrical parameters on the structure of the flow field has been found. The vertical velocity component in front of a plane electrode decreases with distance. Due to the resulting pressure gradient a well-defined bubble curtain is formed at such electrodes. Gas voidage data derived from experimental velocity data are in close agreement with the predictions of the coalescence barrier model which is valid for electrolyte solutions.
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