TY - JOUR
T1 - CFD-DEM modelling of mixing and segregation of binary mixtures of ellipsoidal particles in liquid fluidizations
AU - Molaei, Esmaeil Abbaszadeh
AU - Yu, Aibing
AU - Zhou, Zongyan
N1 - Publisher Copyright:
© 2019, China Ship Scientific Research Center.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Solid-liquid fluidized beds of binary mixtures are widely used in many industries. Particle segregation may occur as particles can differ in size, density, or shape. Extensive studies have been conducted in the past to understand the effects of particlesize and density on the mixing and segregation, but the effect of particle shape has not been well addressed. Therefore, in the present work, CFD-DEM approach is employed to perform a numerical analysis of the effect of particle shape on the particle mixing and segregation phenomenon in liquid fluidization system. Different particle shapes from oblate to prolate are produced by varying aspect ratio of ellipsoids from 0.25 to 3, and eight binary mixtures of spheres and ellipsoids are examined. The results show that when oblate or prolate particles are added to spheres, the segregation takes place. The segregation degree increases with particle aspect ratio diverging from 1.0 and also liquid superficial velocity. The relationship of mixing index with aspect ratio under different liquid velocities is established, and a detailed explanation is given. It is revealed that increasing the projected area and hence the drag force results in the separation of ellipsoidal particles from spheres.
AB - Solid-liquid fluidized beds of binary mixtures are widely used in many industries. Particle segregation may occur as particles can differ in size, density, or shape. Extensive studies have been conducted in the past to understand the effects of particlesize and density on the mixing and segregation, but the effect of particle shape has not been well addressed. Therefore, in the present work, CFD-DEM approach is employed to perform a numerical analysis of the effect of particle shape on the particle mixing and segregation phenomenon in liquid fluidization system. Different particle shapes from oblate to prolate are produced by varying aspect ratio of ellipsoids from 0.25 to 3, and eight binary mixtures of spheres and ellipsoids are examined. The results show that when oblate or prolate particles are added to spheres, the segregation takes place. The segregation degree increases with particle aspect ratio diverging from 1.0 and also liquid superficial velocity. The relationship of mixing index with aspect ratio under different liquid velocities is established, and a detailed explanation is given. It is revealed that increasing the projected area and hence the drag force results in the separation of ellipsoidal particles from spheres.
KW - binary mixture
KW - CFD-DEM
KW - ellipsoids
KW - liquid fluidization
KW - Mixing
KW - segregation
UR - https://www.scopus.com/pages/publications/85076483680
U2 - 10.1007/s42241-019-0019-z
DO - 10.1007/s42241-019-0019-z
M3 - 文章
AN - SCOPUS:85076483680
SN - 1001-6058
VL - 31
SP - 1190
EP - 1203
JO - Journal of Hydrodynamics
JF - Journal of Hydrodynamics
IS - 6
ER -