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Meso-scale statistical properties of gas-solid flowa direct numerical simulation (DNS) study
Liu, Xiaowen1,2; Wang, Limin1; Ge, Wei1
2017
发表期刊AICHE JOURNAL
ISSN0001-1541
卷号63期号:1页码:3-14
摘要Statistical properties of particles in heterogeneous gas-solid flow were numerically investigated based on the results of a three-dimensional large-scale direct numerical simulation (DNS). Strong scale-dependence and local non-equilibrium of these properties, especially the particle fluctuating velocity (PFV) or granular temperature, were observed to be related to the effect of meso-scale structures formed by the compromise in competition between fluid and particle dominated mechanisms. To quantify such effects, the heterogeneous structures were partitioned into a gas-rich dilute phase and a solid-rich dense phase according to the particle-scale voidage defined through the Voronoi tessellation. Non-equilibrium features, such as the deviation of PFV from Gaussian distribution and anisotropy, were found even in phase-specific properties. A new distribution function for the PFV well characterizing these features was obtained by fitting the DNS results, which takes a typical bi-disperse mode, with phase-specific granular temperatures. The implications of these findings to the kinetic theory of granular flow and traditional continuum models of gas-solid flow were also discussed. (c) 2016 American Institute of Chemical Engineers AIChE J, 63: 3-14, 2017
关键词Direct Numerical Simulation Meso-scale Structure Statistical Analysis Gas-solid Flow Fluidization
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1002/aic.15489
收录类别SCI ; ISTP
语种英语
关键词[WOS]CIRCULATING FLUIDIZED-BED ; DISCRETE PARTICLE SIMULATION ; STRUCTURE-DEPENDENT DRAG ; VELOCITY FLUCTUATIONS ; GRANULAR ASSEMBLIES ; KINETIC-THEORY ; SLIP VELOCITY ; CFB RISER ; SYSTEMS ; DYNAMICS
WOS研究方向Engineering
WOS类目Engineering, Chemical
WOS记录号WOS:000390272500002
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21858
专题多相复杂系统国家重点实验室
作者单位1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Liu, Xiaowen,Wang, Limin,Ge, Wei. Meso-scale statistical properties of gas-solid flowa direct numerical simulation (DNS) study[J]. AICHE JOURNAL,2017,63(1):3-14.
APA Liu, Xiaowen,Wang, Limin,&Ge, Wei.(2017).Meso-scale statistical properties of gas-solid flowa direct numerical simulation (DNS) study.AICHE JOURNAL,63(1),3-14.
MLA Liu, Xiaowen,et al."Meso-scale statistical properties of gas-solid flowa direct numerical simulation (DNS) study".AICHE JOURNAL 63.1(2017):3-14.
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