Abstract
A “constant volume” technique is described for measuring the instantaneous rates of solution of rising gas bubbles in liquids; this simultaneously determines the bubble shape, area and rising velocity at the instant of measurement. The method has been tested using carbon dioxide bubbles in water and is seen to give excellent results which have been extended to include carbon dioxide bubbles in two viscous Newtonian aqueous solutions of glycerol and in a non-Newtonian viscoelastic pseudoplastic aqueous solution of polyethylene oxide (“polyox”). Results covering a wide range of bubble sizes (0·2–6·0 cm equivalent spherical diameter) are reported. The observed changes in bubble shape with size in each liquid are documented, and detailed comparisons of the collected data with existing theoretical models relating to bubble rise velocity and overall mass transfer coefficient are carried out. A new theory for mass transfer in the bubble wake is developed and found to agree with observation to a first approximation.
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