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Quantifying the non-equilibrium characteristics of heterogeneous gas-solid flow of smooth, inelastic spheres using a computational fluid dynamics-discrete element method

文献类型：期刊论文

作者Wang, Jing1,2; Chen, Xizhong1,2; Bian, Wei1,2; Zhao, Bidan1,2; Wang, Junwu1,2
刊名JOURNAL OF FLUID MECHANICS
出版日期2019-05-10
卷号866页码:776-790
关键词fluidized beds granular media particle fluid flow
ISSN号0022-1120
DOI10.1017/jfm.2019.156
英文摘要Continuum modelling of dense gas-solid flows strongly depends on the constitutive relations used, including the interphase drag force, particle phase stress and the boundary condition for particle-wall interactions. The lack of scale separation is usually claimed to cause the breakdown of the Navier-Stokes (NS) order continuum theory. In this study, computational fluid dynamics-discrete element method (CFD-DEM) simulations of bubbling, turbulent and fast fluidization of smooth, inelastic spheres were conducted to systematically analyse the valid range of NS theory. An entropy-based criterion I-s and Knudsen numbers defined using different characteristic length scales ( Kn(frac) , Kngran and Kn(vel) ) were quantified. It was found that (i) except at the centre of bubbles where the solid concentration is quite low, NS theory for discrete particles was valid for bubbling fluidization irrespective of the breakdown criterion. Even at the boundary of the bubbles, values of I-s and Kn were small; and (ii) the conclusion depended on the criterion used in turbulent and fast fluidization. If Kn(frac) was used, NS theory would be generally valid. If I-s was chosen, NS theory would be still valid but with lower confidence. However, if Kn(vel) or Kn(gran) was selected, NS theory broke down. Because I-s includes the non-equilibrium effects caused by the gradient of hydrodynamic fields and particle inelasticity, we may conclude that NS theory was valid for all tested cases. This means that the continuum description of discrete particles is not the main source of the breakdown of NS theory.
WOS关键词THEORY-BASED PREDICTIONS ; NUMERICAL-SIMULATION ; EULERIAN SIMULATION ; MULTISCALE METHOD ; 2-FLUID MODEL ; CONTINUUM ; BEDS ; PARTICLES ; EQUATIONS ; GELDART
资助项目National Natural Science Foundation of China[91834303] ; Key Research Program of Frontier Science, Chinese Academy of Sciences[QYZDJ-SSW-JSC029] ; 'Transformational Technologies for Clean Energy and Demonstration', the Strategic Priority Research Program of the Chinese Academy of Sciences[XDA21030700]
WOS研究方向Mechanics ; Physics
语种英语
WOS记录号WOS:000462632600004
出版者CAMBRIDGE UNIV PRESS
资助机构National Natural Science Foundation of China ; Key Research Program of Frontier Science, Chinese Academy of Sciences ; 'Transformational Technologies for Clean Energy and Demonstration', the Strategic Priority Research Program of the Chinese Academy of Sciences
源URL[http://ir.ipe.ac.cn/handle/122111/28205]  
专题中国科学院过程工程研究所
通讯作者Wang, Junwu
作者单位1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, POB 353, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Jing,Chen, Xizhong,Bian, Wei,et al. Quantifying the non-equilibrium characteristics of heterogeneous gas-solid flow of smooth, inelastic spheres using a computational fluid dynamics-discrete element method[J]. JOURNAL OF FLUID MECHANICS,2019,866:776-790.
APA Wang, Jing,Chen, Xizhong,Bian, Wei,Zhao, Bidan,&Wang, Junwu.(2019).Quantifying the non-equilibrium characteristics of heterogeneous gas-solid flow of smooth, inelastic spheres using a computational fluid dynamics-discrete element method.JOURNAL OF FLUID MECHANICS,866,776-790.
MLA Wang, Jing,et al."Quantifying the non-equilibrium characteristics of heterogeneous gas-solid flow of smooth, inelastic spheres using a computational fluid dynamics-discrete element method".JOURNAL OF FLUID MECHANICS 866(2019):776-790.

入库方式： OAI收割

来源：过程工程研究所

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