Heat transfer in a pulsed fluidized bed by using coupled CFD-DEM method

被引：38

作者：

Zhang, Kai ^{[1
]}

Wang, Shuai ^{[1
]}

Li, Bowen ^{[1
]}

He, Yurong ^{[1
]}

Zhao, Yunhua ^{[2
]}

机构：

[1] Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Peoples R China

[2] Zhejiang Univ Technol, Coll Mech Engn, Hangzhou 310014, Peoples R China

来源：

POWDER TECHNOLOGY | 2020年 / 367卷

基金：

中国国家自然科学基金;

关键词：

Heat transfer; Fluidized bed; Discrete element model; Pulsed flow; BIOMASS PARTICLES; FLOW; SEGREGATION; SIMULATION; HYDRODYNAMICS; GASIFICATION; MIXTURES; REACTOR;

D O I：

10.1016/j.powtec.2020.04.013

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Heat transfer behaviors in a pulsed fluidized bed are numerically investigated by means of a combined approach of computational fluid dynamics (CFD) and discrete element method (DEM). The effect of pulsation flow on bed heat transfer characteristics is evaluated. It is found that the pulsed gas flow leads to an intense oscillating flow behavior in the bed, enhancing the the cooling rate of hot particles. Three kinds of heat transfer mechanisms arc examined. The results reveal that the particle-fluid convection is dominated. Meanwhile, heat transfer mechanisms in a polydisperse system are also discussed. It is observed that the addition of fine particles promotes the total particle-fluid convection and the fluctuating degree with time becomes evident. (C) 2020 Elsevier B.V. All rights reserved.

引用

页码：497 / 505

页数：9

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