Scale and structure dependent drag in gas-solid flows

被引：39

作者：

Liu, Xiaowen ^{[1
,2
]}

Ge, Wei ^{[1
,2
]}

Wang, Limin ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Chem Engn, Beijing, Peoples R China

来源：

AICHE JOURNAL | 2020年 / 66卷 / 04期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

direct numerical simulation; drag correlation; fluidization; gas-solid flow; structure-dependent drag; DIRECT NUMERICAL-SIMULATION; LATTICE-BOLTZMANN SIMULATIONS; GRANULAR TEMPERATURE; BIDISPERSE ARRAYS; PAST MONODISPERSE; 2-FLUID MODELS; CFD SIMULATION; FLUIDIZED-BEDS; STOKES NUMBER; FORCE;

D O I：

10.1002/aic.16883

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Drag plays a crucial role in hydrodynamic modeling and simulations of gas-solid flows, which is significantly affected by particle Reynolds number, solid volume fraction, heterogeneity, granular temperature, particle-fluid density ratio, and so on. To clarify and quantify the multiscale effects of these factors, large-scale particle-resolved direct numerical simulations of gas-solid flows with up to 115,200 freely moving particles are conducted. Both domain-averaged kinetic properties and local averaged dimensionless drag are sampled and analyzed. It is revealed that the complex scale-dependence of drag is attributed to the multiscale effects of heterogeneous structures and particle fluctuating velocity. The granular temperature and the scalar variance of solid volume fraction are also found to be scale-dependent. On account of these, a new drag correlation as the function of Froude number is proposed with consideration of scale-dependence.

引用

页数：13

共 66 条

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