Authors: A. Lanza a, M. A. Islam a, and H. de Lasa a
a Chemical Reactor Engineering Centre, Faculty of Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
Source: Lanza, A.; Islam, M. A.; de Lasa, H. CPFD Modeling and Experimental Validation of Gas–Solid Flow in a down Flow Reactor. Computers & Chemical Engineering 2016, 90, 79–93.
Abstract: This manuscript reports the fluid dynamics in the developed flow region of a cocurrent gas–solid down flow fluidized bed unit. Gas–solid flows are simulated using a Computational Particle Fluid Dynamics (CPFD) numerical scheme and experimental data from the CREC-GS-Optiprobes. This model represents clusters in a downer unit. It is hypothesized that in downers, clusters are formed via a Random Particle-Selection Method (RPSM) ensuring cluster dynamic stability. To accomplish this, a statistical particle-selection of clusters (SPSC) method is developed. This hybrid model is validated with experimental data obtained in a 2 m height and 2.57 cm diameter column. Observed time-averaged axial and radial velocities and solid concentration profiles are successfully simulated by the Hybrid CPFD/CREC–GS–Optiprobes Data Model. These findings support: (a) a narrow distribution of particle cluster residences, (b) the relatively flat radial solid concentrations and solid cluster velocities, and (c) a valuable approach for establishing slip velocities in downer units.
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