Mixing and dispersion behaviours of ellipsoid particles in a bubbling fluidized bed

doi:10.1016/j.powtec.2021.10.036

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	Mixing and dispersion behaviours of ellipsoid particles in a bubbling fluidized bed
	Yang, Shiliang ; Hu, Site 3; Zhang WT(张炆涛)
刊名	POWDER TECHNOLOGY
	2022-01
卷号	396 页码:210
关键词	Non-spherical particles Discrete element method Solid mixing Solid dispersion Fluidized bed
ISSN号	0032-5910
DOI	10.1016/j.powtec.2021.10.036
英文摘要	Fluidization of non-spherical particles is widely practised in chemical engineering processes. In this work, the mixing and dispersion behaviours of non-spherical particles in a bubbling fluidized bed (BFB) are explored by a computational fluid dynamics-discrete element method (CFD-DEM) featuring a super-quadric model to describe particle morphology. After model validation, the general flow patterns, solid mixing, and solid dispersion of ellipsoid particles are studied, together with the discussion of the effect of aspect ratio (AR) on fluidization behaviours. The results show that minimum fluidization velocity increases with the aspect ratio. Bed permeability depends on bed porosity and particle shape. Bubbles place a significant role in determining flow patterns, which induce a double-recirculation pattern where particles mainly move from the wall region to the central region in the lower bed and oppositely in the upper bed. Ellipsoid particles with higher sphericity (e.g., AR = 0.75 and 1.5) show a smaller mixing index in the bed. The magnitudes of solid dispersion coefficients in x,y, and z directions are about similar to 10(-3) m(2)/s, similar to 10(-5) m(2)/s, and similar to 10(-2) m(2)/s, respectively. Ellipsoid particles with higher sphericity show larger solid dispersion intensity. These findings shed light on the fundamental understanding of the particle shape on fluidization dynamics. (C) 2021 Elsevier B.V. All rights reserved.
学科主题	Engineering, Chemical
分类号	二类/Q1
语种	英语
WOS记录号	WOS:000722586000001
资助机构	Applied Basic Research Project of Yunnan Province, China [202001AU070030]
其他责任者	Zhang, WT (corresponding author), Midea Corp Res Ctr, Foshan 528311, Guangdong, Peoples R China.
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/90215]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
作者单位	1.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China 2.Midea Corp Res Ctr, Foshan 528311, Guangdong, Peoples R China 3.Kunming Univ Sci & Technol, State Key Lab Complex Nonferrous Met Resources Cl, Kunming 650093, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Yang, Shiliang,Hu, Site,Zhang WT. Mixing and dispersion behaviours of ellipsoid particles in a bubbling fluidized bed[J]. POWDER TECHNOLOGY,2022,396:210.
APA	Yang, Shiliang,Hu, Site,&张炆涛.(2022).Mixing and dispersion behaviours of ellipsoid particles in a bubbling fluidized bed.POWDER TECHNOLOGY,396,210.
MLA	Yang, Shiliang,et al."Mixing and dispersion behaviours of ellipsoid particles in a bubbling fluidized bed".POWDER TECHNOLOGY 396(2022):210.