Settling of particles in liquids: Effects of material properties

Kejun J Dong, Runyu Yang, Ruiping Zou, Aibing Yu

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This article presents a numerical study on the settling of uniform spheres in liquids by means of the discrete element method. The effects of particle and liquid properties, such as particle size, Hamaker constant, liquid density, and viscosity, on the formation of packed beds or cakes were studied in terms of packing fraction, radial distribution function (RDF), and coordination number (CN). The results showed that the packing fraction of a cake increases with increasing particle size but decreases with increasing the Hamaker constant, liquid density, and viscosity. RDF and CN also change correspondingly: packings with lower packing fraction generally have RDFs with fewer peaks and smaller mean CNs. A good correlation between packing fraction and other structural properties was identified. The analysis of the particle-particle and liquid-particle interactions showed that the packing properties are mainly affected by the ratio of the interparticle cohesion to the effective gravity of particles. The previously proposed equation linking packing fraction with the interparticle forces has been extended to incorporate the impact-induced pressure force in a settling process. Based on the modified equation, the effects of key variables on the relationship between packing fraction and particle size were re-examined for general application.
Original languageEnglish
Pages (from-to)1409 - 1421
Number of pages13
JournalAIChE Journal
Volume58
Issue number5
DOIs
Publication statusPublished - 2012
Externally publishedYes

Cite this

Dong, Kejun J ; Yang, Runyu ; Zou, Ruiping ; Yu, Aibing. / Settling of particles in liquids: Effects of material properties. In: AIChE Journal. 2012 ; Vol. 58, No. 5. pp. 1409 - 1421.
@article{801768ab32a54f36bfb57871846c571f,
title = "Settling of particles in liquids: Effects of material properties",
abstract = "This article presents a numerical study on the settling of uniform spheres in liquids by means of the discrete element method. The effects of particle and liquid properties, such as particle size, Hamaker constant, liquid density, and viscosity, on the formation of packed beds or cakes were studied in terms of packing fraction, radial distribution function (RDF), and coordination number (CN). The results showed that the packing fraction of a cake increases with increasing particle size but decreases with increasing the Hamaker constant, liquid density, and viscosity. RDF and CN also change correspondingly: packings with lower packing fraction generally have RDFs with fewer peaks and smaller mean CNs. A good correlation between packing fraction and other structural properties was identified. The analysis of the particle-particle and liquid-particle interactions showed that the packing properties are mainly affected by the ratio of the interparticle cohesion to the effective gravity of particles. The previously proposed equation linking packing fraction with the interparticle forces has been extended to incorporate the impact-induced pressure force in a settling process. Based on the modified equation, the effects of key variables on the relationship between packing fraction and particle size were re-examined for general application.",
author = "Dong, {Kejun J} and Runyu Yang and Ruiping Zou and Aibing Yu",
year = "2012",
doi = "10.1002/aic.12682",
language = "English",
volume = "58",
pages = "1409 -- 1421",
journal = "AIChE Journal",
issn = "0001-1541",
publisher = "John Wiley & Sons",
number = "5",

}

Settling of particles in liquids: Effects of material properties. / Dong, Kejun J; Yang, Runyu; Zou, Ruiping; Yu, Aibing.

In: AIChE Journal, Vol. 58, No. 5, 2012, p. 1409 - 1421.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Settling of particles in liquids: Effects of material properties

AU - Dong, Kejun J

AU - Yang, Runyu

AU - Zou, Ruiping

AU - Yu, Aibing

PY - 2012

Y1 - 2012

N2 - This article presents a numerical study on the settling of uniform spheres in liquids by means of the discrete element method. The effects of particle and liquid properties, such as particle size, Hamaker constant, liquid density, and viscosity, on the formation of packed beds or cakes were studied in terms of packing fraction, radial distribution function (RDF), and coordination number (CN). The results showed that the packing fraction of a cake increases with increasing particle size but decreases with increasing the Hamaker constant, liquid density, and viscosity. RDF and CN also change correspondingly: packings with lower packing fraction generally have RDFs with fewer peaks and smaller mean CNs. A good correlation between packing fraction and other structural properties was identified. The analysis of the particle-particle and liquid-particle interactions showed that the packing properties are mainly affected by the ratio of the interparticle cohesion to the effective gravity of particles. The previously proposed equation linking packing fraction with the interparticle forces has been extended to incorporate the impact-induced pressure force in a settling process. Based on the modified equation, the effects of key variables on the relationship between packing fraction and particle size were re-examined for general application.

AB - This article presents a numerical study on the settling of uniform spheres in liquids by means of the discrete element method. The effects of particle and liquid properties, such as particle size, Hamaker constant, liquid density, and viscosity, on the formation of packed beds or cakes were studied in terms of packing fraction, radial distribution function (RDF), and coordination number (CN). The results showed that the packing fraction of a cake increases with increasing particle size but decreases with increasing the Hamaker constant, liquid density, and viscosity. RDF and CN also change correspondingly: packings with lower packing fraction generally have RDFs with fewer peaks and smaller mean CNs. A good correlation between packing fraction and other structural properties was identified. The analysis of the particle-particle and liquid-particle interactions showed that the packing properties are mainly affected by the ratio of the interparticle cohesion to the effective gravity of particles. The previously proposed equation linking packing fraction with the interparticle forces has been extended to incorporate the impact-induced pressure force in a settling process. Based on the modified equation, the effects of key variables on the relationship between packing fraction and particle size were re-examined for general application.

UR - http://onlinelibrary.wiley.com.ezproxy.lib.monash.edu.au/doi/10.1002/aic.12682/epdf

U2 - 10.1002/aic.12682

DO - 10.1002/aic.12682

M3 - Article

VL - 58

SP - 1409

EP - 1421

JO - AIChE Journal

JF - AIChE Journal

SN - 0001-1541

IS - 5

ER -