Journal
CHEMICAL ENGINEERING SCIENCE
Volume 144, Issue -, Pages 201-215Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2016.01.041
Keywords
Discrete element method; Heat transfer; Ellipsoids; Effective thermal conductivity; Fluidized beds
Categories
Funding
- Australian Research Council
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Particle shape can affect the flow and thermal behavior significantly in particle-fluid flow systems. In this work, the combined approach of discrete element method (DEM) and computational fluid dynamics (CFD) is extended to study the heat transfer in packed and fluidized beds of ellipsoids. The aspect ratio of ellipsoids varies from 0.25 to 3.5, representing disk-type and cylinder-type particles, respectively. The conductive heat transfer models for ellipsoids are proposed first, and then the effect of aspect ratio on the bed thermal properties is investigated. It is revealed that aspect ratio affects the effective thermal conductivity of packed beds significantly due to the increased particle-particle contact number and area. The study of bed heating process indicates that compared with spheres, ellipsoids have lower convective heat transfer rate but higher conductive heat transfer rate. In fluidized beds, the convective heat transfer coefficients of prolate particles are larger than those of spheres and oblate particles. The model offers an effective method to examine the effect of particle shape on heat transfer in fluid bed reactors at a particle scale. (C) 2016 Elsevier Ltd. All rights reserved.
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