Abstract
The flow in the annulus of a water spouted bed of small glass particles 0.574mm and 0.964mm in diameter is studied in a cylindrical half-column 90 mm in diameter. An axisymmetric model of flow, which assumes Darcy flow in the annulus and uses the experimental spoutannulus interfacial boundary condition, predicts the annulus fluid streamlines of fine particle beds well. The model calculations show that the average fluid velocity at the top of the annulus decreases as particle size and bed height decrease and the fluid residence time distribution in the annulus is broad. Particles are observed entering the spout primarily near the spout inlet in agreement with the predicted axial voidage profile in the spout.
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