颗粒-流体密度比对两相流动不稳定性影响的格子-Boltzmann方法模拟

doi:10.7523/j.issn.2095-6134.2017.02.012

中国科学院大学学报 ›› 2017, Vol. 34 ›› Issue (2): 198-203.DOI: 10.7523/j.issn.2095-6134.2017.02.012

颗粒-流体密度比对两相流动不稳定性影响的格子-Boltzmann方法模拟

刘国栋¹, YIN Xiaolong², 王帅¹, 陆慧林¹, 张亚男¹

1 哈尔滨工业大学能源科学与工程学院, 哈尔滨 150001;
2 Petroleum Engineering Department of Colorado School of Mines, Golden 80401

收稿日期:2016-05-25 修回日期:2016-09-06 发布日期:2017-03-15
通讯作者: 刘国栋,E-mail:gdliu@hit.edu.cn
基金资助:
国家自然科学基金（51106039）和黑龙江省自然科学基金（E201205）资助

Lattice-Boltzmann simulation of the effect of particle-fluid density ratio on instability of two-phase flow

LIU Guodong¹, YIN Xiaolong², WANG Shuai¹, LU Huilin¹, ZHANG Yanan¹

1 School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2 Petroleum Engineering Department of Colorado School of Mines, Golden 80401, USA

Received:2016-05-25 Revised:2016-09-06 Published:2017-03-15

摘要/Abstract

摘要： 采用格子-Boltzmann方法模拟周期性边界计算域内的颗粒流化。计算采用的流化系统Archimedes数为1 432，对应于颗粒终端Reynolds数为30。研究模拟颗粒浓度为25% ，颗粒-流体密度比为2~1 000时，密度比对流体-颗粒流动不稳定性的影响。密度比的范围对应由液固到气固的两相流动。颗粒与颗粒之间的碰撞采用弹性碰撞。研究获得颗粒平均速度、速度方差、偏度及峰度随密度比变化的规律。结合结构因子的分析，因密度比变化使颗粒-流体流动由稳定转变为不稳定的过程中颗粒速度特性变化与聚团形成的关系被确定，也确定了不稳定流动产生时所对应的密度比范围。

关键词: 格子-Boltzmann方法, 颗粒-流体密度比, 流动不稳定性

Abstract: A lattice-Boltzmann method is used to simulate the hydrodynamic property of particles in a periodic domain. An Archimedes number of 1 432 is used for the system corresponding to the terminal Reynolds number of 30. Simulations are carried out when the average solid volume fraction is 25[WTB4]%[WTBZ], and the density ratio ranges from 2 to 1 000 (from liquid-particle density ratio to gas-particle density ratio). Investigation of the effect of density ratio on stability of the fluid-particle flow system is carried out. The collision among particles is consideved to be elastic. The variations regulations of mean particle velocity, variance, skewness and kurtosis are obtained and analyzed. By combining with the structure factor analysis, the relationships between particle velocity properties and dynamic clusters are determined at different density ratios when the stable-unstable transition occurs, and the density ratio range is also determined.

Key words: lattice-Boltzmann method, particle-fluid density ratio, flow instability

中图分类号:

TK224

刘国栋, YIN Xiaolong, 王帅, 陆慧林, 张亚男. 颗粒-流体密度比对两相流动不稳定性影响的格子-Boltzmann方法模拟[J]. 中国科学院大学学报, 2017, 34(2): 198-203.

LIU Guodong, YIN Xiaolong, WANG Shuai, LU Huilin, ZHANG Yanan. Lattice-Boltzmann simulation of the effect of particle-fluid density ratio on instability of two-phase flow[J]. , 2017, 34(2): 198-203.

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颗粒-流体密度比对两相流动不稳定性影响的格子-Boltzmann方法模拟

Lattice-Boltzmann simulation of the effect of particle-fluid density ratio on instability of two-phase flow

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