Meso-scale statistical properties of gas-solid flowa direct numerical simulation (DNS) study | |
Liu, Xiaowen; Wang, Limin; Ge, Wei | |
2017 | |
会议日期 | JUN 12-15, 2016 |
会议地点 | Minneapolis, MN |
关键词 | Direct Numerical Simulation Circulating Fluidized-bed Meso-scale Structure Discrete Particle Simulation Statistical Analysis Structure-dependent Drag Gas-solid Flow Velocity Fluctuations Fluidization Granular Assemblies Kinetic-theory Slip Velocity Cfb Riser Systems Dynamics |
卷号 | 63 |
DOI | 10.1002/aic.15489 |
页码 | 3 |
英文摘要 | 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 |
会议录 | Article; Proceedings Paper |
WOS记录号 | WOS:000390272500002 |
内容类型 | 会议论文 |
源URL | [http://ir.ipe.ac.cn/handle/122111/28941] |
专题 | 中国科学院过程工程研究所 |
推荐引用方式 GB/T 7714 | Liu, Xiaowen,Wang, Limin,Ge, Wei. Meso-scale statistical properties of gas-solid flowa direct numerical simulation (DNS) study[C]. 见:. Minneapolis, MN. JUN 12-15, 2016. |
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