Numerical investigations on gas-solid flow in circulating fluidized bed risers using a new cluster-based drag model  

作　　者：Zeneng Sun Chao Zhang Jesse Zhu 

机构地区：[1]Department of Chemical and Biochemical Engineering.The University of Western Ontario,London,Ontario,N6A 3K7,Canada [2]Department of Mechanical and Materials Engineering,The University of Western Ontario,London,Ontario,N6A 3K7,Canada

出　　处：《Particuology》2022年第4期9-23,共15页颗粒学报（英文版）

摘　　要：A cluster-based drag model is proposed for the gas-solid circulating fluidized bed(CFB)riser by including the cluster information collected from image processing and wavelet analysis into the calculation of system drag.The performance of the proposed drag model is compared with some commonly used drag models.A good agreement with the experimental data is achieved by the proposed cluster-based drag model.Error analysis of the proposed cluster-based drag model based on the local distributions of solids holdup and particle velocity is conducted.The clustering phenomenon in the low-density and high-density CFB risers and the effect of the cluster size on the simulation accuracy are also numerically studied by the proposed drag model.

关 键 词：Drag model Clustering effect Gas-solid flow structures Circulating fluidized bed 

分 类 号：O35[理学—流体力学]