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New description of fluidization regimes

Andreux, Régis and Chaouki, Jamal and Gauthier, Thierry and Simonin, Olivier New description of fluidization regimes. (2005) AIChE Journal, vol. 5 (n° 4). pp. 1125-1130. ISSN 0001-1541

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Official URL: http://dx.doi.org/10.1002/aic.10380

Abstract

Two pressure probes and an intrusive bi-optical probe provide experimental data in the bubbling and turbulent regimes to improve our understanding of the bubbling to fast fluidization regimes transition. Pressure, voidage and bubbling properties assessment allows for new description of turbulent fluidization hydrodynamics. Appreciable changes in the hydrodynamics appear well below the transition criterion Uc determined based on pressure fluctuations: bubbles are fast bubbles below Uc, in bubble-emulsion equilibrium state at Uc, and then become slow bubbles for higher fluidizing velocity; the maximum of the total fluidizing gas fraction in the bubble-phase is reached below Uc and never exceeds 75-80 %. The fluidizing velocity at which major hydrodynamics modifications are observed is lower than Uc. This critical velocity is detected with pressure drop assessment or voidage fluctuations frequency analysis. Moreover, it can be theoretically calculated from the two-phase modeling correlations supplemented with a new criterion deduced from our experiments.

Item Type:Article
Additional Information:The original publication is available on http://www3.interscience.wiley.com/journal/107061889/home
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > IFP Energies Nouvelles - IFPEN (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Ecole Polytechnique de Montréal (CANADA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By: Régis Andreux

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