A study of bubble dynamics and mass transfer in stagnant liquid systems
Wade, Dennis E.
Doctor of Philosophy thesis
The purpose of this investigation was to study the effect of physical properties and system dimensions on the mass transfer between a gas bubble and the parent liquid for the case of stagnant liquid. The study was divided into two parts; (1) the effect of these variables on the bubbling and (2) the effect of these variables on the mass transfer. The bubbling data were found to correlate to within 25% on a dimensionless plot. For Reynolds numbers above 100 the resulting equation is: fDg 1/2 mmH2O 0.05=0.27Re 0.06 For the three orifices which produced similar results the same plot correlated the data to within 12%. The equation for the data for Re above 1000 is: fDg 1/2 mmH2O 0.05=0.22Re 0.06 A mechanism for the formation of the bubbles based on the break-up of a jet is proposed. On the basis of this mechanism the shape and break point in the curve of frequency versus orifice velocity may be predicted. In the mass transfer study the approach to equilibrium was above 90% for the systems studied. This was found to be independent of the physical properties and system dimensions. It is shown that this result is predicted by the penetration theory. This theory is applied to an operating column.