Abstract
It is shown that five different mechanisms of mass transfer in forming drops and bubbles which have been proposed in the literature, for a sphere growing uniformly with time, can be described by the equation: ▪ where N A is the mass transferred from the drop or bubble in time t, and d f is the drop diameter at the end of the formation period t f . Depending on the particular mechanism the constant assumes different numerical values ranging from 6 7 to 24 7 . The validity of the different mechanisms has been tested by measuring mass transfer from drops formed at a nozzle tip at different rates. Sodium iodide (Na 131I) was extracted from single water drops into isobutyl alcohol and the mass transferred was measured by a radiotracer technique. Drop formation and withdrawal times were varied independently and mass transfer during the formation time was obtained by extrapolation. The results yielded a mean value of 1·32 ± 0·24 (95 per cent confidence level) for the constant which substantiates the value of 1·31 predicted by Ilcovic's mechanism.
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