Studies of hydrodynamic cavitation in electrochemistry

Abstract

The project involves the study of hydrodynamic cavitation induced by flowing solution through a venturi at high linear flow velocities in the range 3 to 31 m s'\ Visual observation and recording of the noise was used to show that cavitation commenced at linear flow velocities of 18.5 m s'^ and 25.0 m s"' for 1 mm and 2 mm diameter Venturis respectively. An increase in bulk solution temperature was also associated with cavitation. Voltammetry at a platinum microdisc electrode of ferri/ferrocyanide couple mixtures in strontium nitrate / potassium nitrate have been used to investigate the variation of mass transport with position close to the venturi, both the magnitude as well as the spatial distribution. It has been confirmed that very rapid mass transport can be achieved with mass transfer coefficients up to 3 x 10"^ m s'\ Optimum limiting current could be achieved when the microdisc electrode was placed towards the outside of the cavitation zone although interference of the microelectrode structure to the flow pattern may contribute to this observation. It was also found that the bubble cavitation extends to some distance from the venturi so that application of cavitation in electrochemical technology should be possible even when an orifice plate and electrode are spatially separated.

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