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.
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]. Journal of University of Chinese Academy of Sciences, 2017
, 34(2)
: 198
-203
.
DOI: 10.7523/j.issn.2095-6134.2017.02.012
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