oa South African Journal of Chemical Engineering - Hydrodynamics of fluidization in an annular space

Volume 19, Issue 3
  • ISSN : 1026-9185



The hydrodynamics of fluidization in a vertically orientated annulus, manufactured from Perspex tubes, was measured optically. Air was used for the fluidization of sieved river sand using multiple air injectors orientated tangentially to the annulus walls. Instead of achieving the desired induced rotation of the fluid bed, jet formation and spouted bed behaviour at superficial gas velocities above the minimum fluidization velocity was observed. To study the hydrodynamic behaviour of the annular fluidized bed in more detail, a representative 2D computational fluid dynamics (CFD) model was developed using COMSOL Multiphysics. It was concluded that although the 2D CFD model could be used as a first estimate, the hydrodynamics of the annular fluidized bed should rather be more accurately modelled in 3D.

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