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Spanning the flow regimes: Generic fluidized‐bed reactor model
Author(s) -
Abba I. A.,
Grace J. R.,
Bi H. T.,
Thompson M. L.
Publication year - 2003
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690490720
Subject(s) - fluidization , mechanics , turbulence , flow (mathematics) , classification of discontinuities , annulus (botany) , fluidized bed , work (physics) , range (aeronautics) , two fluid model , statistical physics , thermodynamics , mathematics , materials science , physics , mathematical analysis , composite material
Probabilistic averaging is used to model fluidized‐bed reactors across the three fluidlization flow regimes most commonly encountered in industry (bubbling, turbulent, and fast fluidization), extending earlier work, which introduced this approach to bridge the bubbling and turbulent regimes of fluidization. In extending this concept to the fast fluidization regime, the probabilities of being in each of the three regimes are represented as probability density functions derived from regime boundary transition data. The three regime‐specific models—a generalized version of a two‐phase bubbling bed model at low gas velocities, a dispersed flow model for turbulent beds at intermediate velocities, and a generalized version of a core‐annulus model at higher velocities—are employed, leading to improved predictions compared with any of the individual models, while avoiding discontinuities at the regime boundaries. Predictions from the new integrated model are in good agreement with available ozone decomposition data over the full range of applicability covered elsewhere.