A Dissertation Submitted to the Faculty of engineering
University of the Witwatersrand, Johannesburg
for the Degree of Master of Science in Engineering
Johannesburg 1984 / The rate of mass transfer at gas evolving electrodes has been shown to be
a strong function of the so-called bubble break off diameter of the gas
bubbles leaving the electrode surface. This dissertation shows how the
population balance can be applied to the formation of gas bubbles at gas
evolving electrodes. This analysis provides a means of predicting the
bubble break off aiameter. Experiments were also performed to measure
the bubble break off diameter as well as other parameters, such as the
rate of bubble growth, used in the population balance moce-i>.
The effect of viscosity, electrolyte flowrate and current on the bubble
break off diameter is also investigated. The flowrate and current have
little effect on the bubble bi ak off diameters, whi.e the break - - -
diameters show a decrease in size with increasing viscosity. The bubble
break off diameters predicted by the population balance mode, and those
measured were significantly larger than those reported in the literature
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/18189 |
| Date | 06 August 2015 |
| Creators | Hofman, David Lester |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
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