An experimental study of the effect of collision properties on spout fluidized bed


Buijtenen, Maureen S. van and Börner, Matthias and Deen, Niels G. and Heinrich, Stefan and Antonyuk, Sergiy and Kuipers, J.A.M. (2009) An experimental study of the effect of collision properties on spout fluidized bed
In: 9th International Symposium on Agglomeration, 22 - 26 June 2009, Shefield, UK.

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Abstract:In this paper we experimentally study the effect of collision properties of different particle systems on
the bed dynamics of a spout fluidized bed. This is done in different flow regimes: the spout-fluidization
regime (case A), the jet-in-fluidized-bed regime (case B) and the spouting-with-aeration regime (case
C). The considered particle systems comprise glass beads, γ-alumina oxide and zeolite 4A particles,
which are all classified as Geldart D. A non-intrusive measurement technique is used, viz. particle
image velocimetry (PIV) to measure the particle flow field in a pseudo two-dimensional (2D) spout
fluidized bed. Additionally, digital images are analyzed using a newly developed digital image analysis
(DIA) algorithm to evaluate the particle volume fraction. It is demonstrated that the new proposed DIA
algorithm provides reliable information on the particle volume fraction, showing that it is a powerful
tool when combined with PIV. The added value of DIA is confirmed by comparing the particle velocity
fields and volumetric particle fluxes.
The particle fluxes display only small differences between the particle systems for each of the
examined flow regimes, with the largest difference in the jet-in-fluidized bed regime. In this regime,
the flow behaviour of the zeolite 4A particles does not show any features of the spout fluidized bed
anymore, but behaviour of an ordinary fluidized bed. This is due to the direct bubble formation above
the bottom plate, which results in a large disturbance near the spout entrance. It seems that zeolite 4A
particles -because of their small restitution coefficient- tend to cluster in a more pronounced way,
producing more bubbles compared to glass beads and γ-alumina oxide particles.
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