CFD-DEM modelling of mixing and segregation of binary mixtures of ellipsoidal particles in liquid fluidizations

Esmaeil Abbaszadeh Molaei, Aibing Yu, Zongyan Zhou

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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 particles size 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.
Original languageEnglish
Number of pages21
JournalJournal of Hydrodynamics
DOIs
Publication statusAccepted/In press - 24 Jan 2019

Cite this

@article{3f685dff3bf84f1f938cfe2f4f1eae90,
title = "CFD-DEM modelling of mixing and segregation of binary mixtures of ellipsoidal particles in liquid fluidizations",
abstract = "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 particles size 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.",
author = "{Abbaszadeh Molaei}, Esmaeil and Aibing Yu and Zongyan Zhou",
year = "2019",
month = "1",
day = "24",
doi = "10.1007/s42241-019-0019-z",
language = "English",
journal = "Journal of Hydrodynamics",
issn = "1878-0342",

}

CFD-DEM modelling of mixing and segregation of binary mixtures of ellipsoidal particles in liquid fluidizations. / Abbaszadeh Molaei, Esmaeil; Yu, Aibing; Zhou, Zongyan.

In: Journal of Hydrodynamics, 24.01.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - CFD-DEM modelling of mixing and segregation of binary mixtures of ellipsoidal particles in liquid fluidizations

AU - Abbaszadeh Molaei, Esmaeil

AU - Yu, Aibing

AU - Zhou, Zongyan

PY - 2019/1/24

Y1 - 2019/1/24

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 particles size 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 particles size 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.

U2 - 10.1007/s42241-019-0019-z

DO - 10.1007/s42241-019-0019-z

M3 - Article

JO - Journal of Hydrodynamics

JF - Journal of Hydrodynamics

SN - 1878-0342

ER -