Abstract
Values of the mass transfer product, k La , have been determined using unsteady state measurements of oxygen dissolution rates in water, in 0.60 m 3 and 0.043 m 3 baffled mixing vessels fitted with geometrically similar flat-bladed turbines and spargers. It was seen that the assumption of quasi steady-state in the gas phase, as often practised hitherto, can lead to large errors in k La . A correlation for the scale-up of aerated mixing vessels is proposed.
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