Modelling turbulent fluidized bed reactors: tracer and fibre optic probe studies |
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| Affiliation: | 1. Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan City 333, Taiwan;2. Division of Pediatric Allergy, Asthma and Rheumatology, Department of Pediatrics, Chang Gung Memorial Hospital Linkou Branch, Taoyuan City 333, Taiwan;3. Artificial Intelligence Research Center, Chang Gung University, Taoyuan City 333, Taiwan;4. Center for Green Technology, Chang Gung University, Taoyuan City 333, Taiwan |
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| Abstract: | Phenomenological models for turbulent fluidized beds are presented in this study. These models are based on a “core-annulus” representation of the turbulent fluidized bed.Three flow regions are considered: (1) gas flows through a dense annular region and is either perfectly mixed or in plug flow; (2) gas circulates in the core as bubbles in plug flow; (3) gas is perfectly mixed in a dense emulsion phase, also in the core zone. The models also account for mass transfer between different regions by assuming various possible gas exchange paths.A new technique which combines novel reflective fibre optic probes and statistical signal treatment is used to measure local flow properties. Results from fibre optic experiments coupled with those from an inert non-adsorbing tracer (helium) allow for mass transfer parameter assessment.These data demonstrate the importance of incorporating an annular region in the simulation of the main bed section of turbulent fluidized beds. Modelling results of this work strongly suggest the critical importance of gas exchange between bubbles in the core and a pseudo-homogeneous annular region. |
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