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Title: Simulation of the hydrodynamics and drying in a spouted bed dryer
Authors: Zhonghua, W. 
Mujumdar, A.S. 
Keywords: Drying
Eulerian model
Gas-particle flow
Heat transfer
Kinetic-frictional model
Mass transfer
Issue Date: Jan-2007
Citation: Zhonghua, W., Mujumdar, A.S. (2007-01). Simulation of the hydrodynamics and drying in a spouted bed dryer. Drying Technology 25 (1) : 59-74. ScholarBank@NUS Repository.
Abstract: Gas-particle flow behavior in a spouted bed of spherical particles was simulated using the Eulerian-Eulerian two-fluid modeling approach, incorporating a kinetic-frictional constitutive model for dense assemblies of the particulate solid. The interaction between gas and particles was modeled using the Gidaspow drag model and the predicted hydrodynamics is compared with published experimental data. To investigate drying characteristics of particulate solids in axisymmetric spouted beds, a heat and mass transfer model was developed and incorporated into the commercial computational fluid dynamics (CFD) code FLUENT 6.2. The kinetics of drying was described using the classical and diffusional models for surface drying and internal moisture drying, respectively. The overall flow patterns within the spouted bed were predicted well by the model; i.e., a stable spout region, a fountain region, and an annular downcomer region were obtained. Calculated particle velocities and concentrations in the axisymmetric spouted bed were in reasonable agreement with the experimental data of He et al. (Can. J. Chem. Eng. 1994a, 72:229; 1994b, 72:561). Such predictions can provide important information on the flow field, temperature, and species distributions inside the spouted bed for process design and scale-up.
Source Title: Drying Technology
ISSN: 07373937
DOI: 10.1080/07373930601160775
Appears in Collections:Staff Publications

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