DEM simulation and analysis of the effects of adhesive forces and rotations of admixed particles on improving main particle flowability

Mikio Yoshida, Ryota Takatsuki, Genta Sakamoto, Jun Oshitani, Kuniaki Gotoh

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

One technique for improving particle flowability is the admixture of nano-particles to the main particles. However, the mechanisms by which this technique improves flowability are not yet fully understood. In this study we examined compressed packing, which is affected by particle flowability. In order to investigate the mechanism of improvement, discrete element method (DEM) simulation was used to investigate the effects of adhesion forces and rotations of admixed particles on packing fraction. We conducted two types of calculations: (1) compressed packing behavior of a particle bed, and (2) particle behavior in a simple model of the relative motion of two of the main particles. The main and admixed particles were given diameters of 400 and 20 nm, respectively. The physical properties of the particles were set based on silica and glass materials. The Hamaker constant of the main particles was kept constant while that of the admixed particle was varied from 2 × 10−27 to 1 × 10−20 J. Simulations were also conducted both allowing and not allowing rotation of admixed particles. In the packing behavior calculations, the results for the packing fraction of the main particles and the compression velocity exhibited peaks at a Hamaker constant of approximately 10−23 J for the admixed particles under 43.8 Pa compression pressure, regardless of the degree of rotation of the admixed particles. This showed that rotation of the admixed particles was not the main reason for the improvement in main particle flowability, and this peak tendency was determined by the Hamaker constant of the admixed particles. In addition, an improvement in the particle flowability via different numbers of layers of admixed particles was explained using a linked rigid-3-bodies model. This implies that the improvement in the flowability is due to a decrease in the resistance of particle movement by changing the configuration to a linked rigid-3-bodies model.

Original languageEnglish
Pages (from-to)2084-2093
Number of pages10
JournalAdvanced Powder Technology
Volume27
Issue number5
DOIs
Publication statusPublished - Sep 1 2016

Fingerprint

Finite difference method
Adhesives
Silicon Dioxide
Adhesion
Physical properties
Silica
Glass

Keywords

  • Admixture of nano-particles
  • Compressed particle bed
  • DEM simulation
  • Packing fraction

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanics of Materials

Cite this

DEM simulation and analysis of the effects of adhesive forces and rotations of admixed particles on improving main particle flowability. / Yoshida, Mikio; Takatsuki, Ryota; Sakamoto, Genta; Oshitani, Jun; Gotoh, Kuniaki.

In: Advanced Powder Technology, Vol. 27, No. 5, 01.09.2016, p. 2084-2093.

Research output: Contribution to journalArticle

@article{9f25b2f7289340ab8d47fc949e4ae4f4,
title = "DEM simulation and analysis of the effects of adhesive forces and rotations of admixed particles on improving main particle flowability",
abstract = "One technique for improving particle flowability is the admixture of nano-particles to the main particles. However, the mechanisms by which this technique improves flowability are not yet fully understood. In this study we examined compressed packing, which is affected by particle flowability. In order to investigate the mechanism of improvement, discrete element method (DEM) simulation was used to investigate the effects of adhesion forces and rotations of admixed particles on packing fraction. We conducted two types of calculations: (1) compressed packing behavior of a particle bed, and (2) particle behavior in a simple model of the relative motion of two of the main particles. The main and admixed particles were given diameters of 400 and 20 nm, respectively. The physical properties of the particles were set based on silica and glass materials. The Hamaker constant of the main particles was kept constant while that of the admixed particle was varied from 2 × 10−27 to 1 × 10−20 J. Simulations were also conducted both allowing and not allowing rotation of admixed particles. In the packing behavior calculations, the results for the packing fraction of the main particles and the compression velocity exhibited peaks at a Hamaker constant of approximately 10−23 J for the admixed particles under 43.8 Pa compression pressure, regardless of the degree of rotation of the admixed particles. This showed that rotation of the admixed particles was not the main reason for the improvement in main particle flowability, and this peak tendency was determined by the Hamaker constant of the admixed particles. In addition, an improvement in the particle flowability via different numbers of layers of admixed particles was explained using a linked rigid-3-bodies model. This implies that the improvement in the flowability is due to a decrease in the resistance of particle movement by changing the configuration to a linked rigid-3-bodies model.",
keywords = "Admixture of nano-particles, Compressed particle bed, DEM simulation, Packing fraction",
author = "Mikio Yoshida and Ryota Takatsuki and Genta Sakamoto and Jun Oshitani and Kuniaki Gotoh",
year = "2016",
month = "9",
day = "1",
doi = "10.1016/j.apt.2016.07.021",
language = "English",
volume = "27",
pages = "2084--2093",
journal = "Advanced Powder Technology",
issn = "0921-8831",
publisher = "Elsevier BV",
number = "5",

}

TY - JOUR

T1 - DEM simulation and analysis of the effects of adhesive forces and rotations of admixed particles on improving main particle flowability

AU - Yoshida, Mikio

AU - Takatsuki, Ryota

AU - Sakamoto, Genta

AU - Oshitani, Jun

AU - Gotoh, Kuniaki

PY - 2016/9/1

Y1 - 2016/9/1

N2 - One technique for improving particle flowability is the admixture of nano-particles to the main particles. However, the mechanisms by which this technique improves flowability are not yet fully understood. In this study we examined compressed packing, which is affected by particle flowability. In order to investigate the mechanism of improvement, discrete element method (DEM) simulation was used to investigate the effects of adhesion forces and rotations of admixed particles on packing fraction. We conducted two types of calculations: (1) compressed packing behavior of a particle bed, and (2) particle behavior in a simple model of the relative motion of two of the main particles. The main and admixed particles were given diameters of 400 and 20 nm, respectively. The physical properties of the particles were set based on silica and glass materials. The Hamaker constant of the main particles was kept constant while that of the admixed particle was varied from 2 × 10−27 to 1 × 10−20 J. Simulations were also conducted both allowing and not allowing rotation of admixed particles. In the packing behavior calculations, the results for the packing fraction of the main particles and the compression velocity exhibited peaks at a Hamaker constant of approximately 10−23 J for the admixed particles under 43.8 Pa compression pressure, regardless of the degree of rotation of the admixed particles. This showed that rotation of the admixed particles was not the main reason for the improvement in main particle flowability, and this peak tendency was determined by the Hamaker constant of the admixed particles. In addition, an improvement in the particle flowability via different numbers of layers of admixed particles was explained using a linked rigid-3-bodies model. This implies that the improvement in the flowability is due to a decrease in the resistance of particle movement by changing the configuration to a linked rigid-3-bodies model.

AB - One technique for improving particle flowability is the admixture of nano-particles to the main particles. However, the mechanisms by which this technique improves flowability are not yet fully understood. In this study we examined compressed packing, which is affected by particle flowability. In order to investigate the mechanism of improvement, discrete element method (DEM) simulation was used to investigate the effects of adhesion forces and rotations of admixed particles on packing fraction. We conducted two types of calculations: (1) compressed packing behavior of a particle bed, and (2) particle behavior in a simple model of the relative motion of two of the main particles. The main and admixed particles were given diameters of 400 and 20 nm, respectively. The physical properties of the particles were set based on silica and glass materials. The Hamaker constant of the main particles was kept constant while that of the admixed particle was varied from 2 × 10−27 to 1 × 10−20 J. Simulations were also conducted both allowing and not allowing rotation of admixed particles. In the packing behavior calculations, the results for the packing fraction of the main particles and the compression velocity exhibited peaks at a Hamaker constant of approximately 10−23 J for the admixed particles under 43.8 Pa compression pressure, regardless of the degree of rotation of the admixed particles. This showed that rotation of the admixed particles was not the main reason for the improvement in main particle flowability, and this peak tendency was determined by the Hamaker constant of the admixed particles. In addition, an improvement in the particle flowability via different numbers of layers of admixed particles was explained using a linked rigid-3-bodies model. This implies that the improvement in the flowability is due to a decrease in the resistance of particle movement by changing the configuration to a linked rigid-3-bodies model.

KW - Admixture of nano-particles

KW - Compressed particle bed

KW - DEM simulation

KW - Packing fraction

UR - http://www.scopus.com/inward/record.url?scp=84992580428&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84992580428&partnerID=8YFLogxK

U2 - 10.1016/j.apt.2016.07.021

DO - 10.1016/j.apt.2016.07.021

M3 - Article

AN - SCOPUS:84992580428

VL - 27

SP - 2084

EP - 2093

JO - Advanced Powder Technology

JF - Advanced Powder Technology

SN - 0921-8831

IS - 5

ER -