Abstract
Axial mixing in the fluid phases of liquid and gas-liquid fluidised beds has been examined by the imperfect pulse method, using radioactive isotopes as tracers. The intensity of mixing is strongly dependent on the particle size of the ballotini and the flow rate of the fluid phases. In beds of 6 mm particles mixing may be neglected except at very high superficial gas velocities, whereas beds of 1 mm particles are characterised by a high degree of mixing in the liquid phase. A new method of data reduction possessing some advantages over the normally used method of moments is applied and discussed.
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