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Numerical Study on Thermal Characteristics in Fluidized Beds Using DEM-CFD

[+] Author Affiliations
Fengguo Tian

Purdue University Calumet, Hammond, IN; Shanghai Jiaotong University, Shanghai, China

Mingchuan Zhang, Bin Wu, Dong Fu

Purdue University Calumet, Hammond, IN

Paper No. HT2009-88253, pp. 81-87; 7 pages
doi:10.1115/HT2009-88253
From:
  • ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences
  • Volume 3: Combustion, Fire and Reacting Flow; Heat Transfer in Multiphase Systems; Heat Transfer in Transport Phenomena in Manufacturing and Materials Processing; Heat and Mass Transfer in Biotechnology; Low Temperature Heat Transfer; Environmental Heat Transfer; Heat Transfer Education; Visualization of Heat Transfer
  • San Francisco, California, USA, July 19–23, 2009
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4358-1 | eISBN: 978-0-7918-3851-8
  • Copyright © 2009 by ASME

abstract

This work used a pseudo three-dimensional discrete element method (DEM) to study the way gas supply patterns affect the thermodynamics characteristics in fluidized beds. During the simulations, gas-to-particle and particle-to-particle heat transfers were considered. Results indicate that there is a lateral temperature gradient of particles in fluidized bed using horizontal air distributor incorporated with even gas supply; nevertheless, in the case of inclined air distributor together with uneven gas supply, it takes a short time for particle phase to achieve a homogenous temperature field. Hydrodynamics analysis and comparison of solid fluxes between the two cases reveal that the bubbles’ lateral movement are reduced due to even gas supply, and the particle-to-gas heat transfer is localized; however, there is an global circulating solids stream in the bed with uneven gas supply, which is thought to expand the particles’ movement range and enhance the thermal transport performance of the fluidizing system.

Copyright © 2009 by ASME
Topics: Fluidized beds

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