Experimental study on solids circulation patterns and bubble behavior using particle imagevelocimetry combined with digital image analysis

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Laverman, J.A. and Roghair, Ivo and Sint Annaland, M. van and Kuipers, J.A.M. (2008) Experimental study on solids circulation patterns and bubble behavior using particle imagevelocimetry combined with digital image analysis. In: 6th International Conference on Computational Fluid Dynamics in the Oil & Gas, Metallurgical and Process Industries, CFD 2008, 10-12 June 2008, Trondheim, Norway.

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Abstract:The hydrodynamics, viz. the solids circulation patterns and
bubble behavior, of a freely bubbling gas-solid fluidized bed
has been investigated experimentally using Particle Image
Velocimetry (PIV) combined with Digital Image Analysis
(DIA). Coupling of these non-invasive measuring techniques
allows us to obtain information on both the bubble behavior
and emulsion phase circulation patterns simultaneously, in
order to study in detail their intricate interaction. In
particular, the combination of DIA with PIV allows correcting
for the influence of particle raining through the roof of the
bubbles on the time-averaged emulsion phase velocity
profiles. Because of the required visual access, this technique
can only be applied for pseudo-2D fluidized beds.
The bubble rise velocity as a function of the equivalent
bubble diameter and the average bubble diameter as a
function of the position above the distributor were
determined with DIA and compared with literature
correlations. Subsequently, the importance was demonstrated
of filtering the instantaneous emulsion phase velocity profiles
obtained with PIV for particle raining, using DIA, to obtain
the time-averaged emulsion phase velocity profiles. The timeaveraged
solids circulation patterns have been studied as a
function of the superficial gas velocity and bed aspect ratio
Item Type:Conference or Workshop Item
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Link to this item:http://purl.utwente.nl/publications/68590
Organisation URL:http://www.sintef.no/Projectweb/CFD2008
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