Abstract
Growth rates of ammonium alum crystals have been measured at different fluid velocities in a single crystal growth cell and a fluidised bed, and at different stirrer speeds in a turbine agitated vessel. To compare the latter with the former, it is necessary to know the particle-fluid slip velocity as a function of the impeller speed, and the method proposed by Hughmark, using Kolmogoroff's theory of isotopic turbulence to take this prediction, is found to be unsatisfactory in the present case.An alternative method is now proposed in which agitated-vessel crystal dissolution data are used to predict the slip velocity by considering it to be related to the particle terminal velocity, but enhanced by the agitation. By this means, all the crystal growth data are correlated successfully with velocity, although growth rates in the agitated vessel are always somewhat higher. It is postulated that this is due to the effect of turbulence on the adsorption layer.
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