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Received October 23, 2014
Accepted February 9, 2015
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Microscopic flow characteristics in fluidized bed of cylinder-shaped particles
College of Energy & Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 1Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
chunhuawang@nuaa.edu.cn
Korean Journal of Chemical Engineering, December 2015, 32(12), 2384-2393(10), 10.1007/s11814-015-0033-y
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Abstract
IBM (Immersed boundary method) and DEM (Discrete element method) coupling method were used to simulate the flow of cylinder-shaped particles in a fluidized bed. The greatest advantage of IBM-DEM is that it can reveal the microscopic characteristics of dense-phase gas-particle flow in Cartesian grids. Large cylinder-shaped particles are very difficult to fluidize, and slugging flow can be observed even if the static bed height is low. The gas flow field around the particle in fluidized bed is analyzed, and the formation and development of vortex behind the particle is affected obviously by the neighboring particles. Particle trajectory is obtained, and the effect of gas phase on particle rotation becomes active as particle size increases. Compared with the experimental results, the gas-solid force in simulation results is higher. This calculation error may be reduced by decreasing the grid size.
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