Investigation of particle-wall interaction in a pseudo-2D fluidized bed using CFD-DEM simulations
Investigation of particle-wall interaction in a pseudo-2D fluidized bed using CFD-DEM simulations作者机构：National Energy Technology Laboratory Morgantown WV26507 USA AECOM Morgantown WV 26507 USA State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China Universidad Carlos III of Madrid Department of Thermal and Fluid Engineering Av. de la Universidad 30 28911 Leganes Madrid Spain
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2016年第14卷第2期
页 面：10-22页
核心收录：
学科分类：0711[理学-系统科学] 07[理学] 08[工学] 09[农学] 070105[理学-运筹学与控制论] 0901[农学-作物学] 081101[工学-控制理论与控制工程] 071101[理学-系统理论] 0811[工学-控制科学与工程] 0701[理学-数学]
主 题：Gas solid tlow Fluidized bed Computational fluid dynamics Discrete element method Particle wall interaction Two dimensional flow
摘 要：We report on discrete element method simulations of a pseudo-two-dimensional （pseudo-2D） fluidized bed to investigate particle-wall interactions. Detailed information on macroscopic flow field variables, including solids pressure, granular temperature, and normal and tangential wall stresses are analyzed. The normal wall stress differs from the solids pressure because of the strong anisotropic flow behavior in the pseudo-2D system. A simple linear relationship exists between normal wall stress and solids pressure. In addition, an effective friction coefficient can be derived to characterize particle-wall flow interaction after evaluating the normal and tangential wall stresses. The effects of inter-particle and particle-wall friction coefficients are evaluated. Strong anisotropic flow behavior in the pseudo-2D system needs to be considered to validate the two-fluid model where the boundary condition is usually developed based on an isotropic assumption. The conclusion has been confirmed by simulation with different particle stiffnesses. Assumptions in the newly developed model for 2D simulation are further examined against the discrete element method simulation.
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