An axisymmetric model of flow in the annulus of a spouted bed of coarse particles which takes into account non‐Darcy flow and utilizes a new and general axial pressure boundary condition at the spout‐annulus interface is presented. The pressure boundary condition and the annulus pressure distribution are experimentally verified and the model used to calculate the residence time distribution and the flowrate at the top of the annulus. In addition, the average axial velocity profile in the annulus is calculated and compared with predictions of several one‐dimensional flow models.
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Littman et al. (1985) studied this question.
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