Solids movement in a spouted bed has been investigated by means of a radioactively marked particle technique, using a scintillation counter as a detector. The average particle velocity in the spout was found to depend on gas flow rate, gas inlet geometry, axial elevation, bed height, and column diameter. The solids circulation rate is shown to be proportional to the gas flow rate and, further, a function of column and gas inlet geometry, density of fluidising gas and particle diameter. Empirical correlations for both the particle velocity in the spout and the solids circulation rate as a function of axial elevation, are presented.
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Velzen et al. (1974) studied this question.
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