Balancing size and density segregation in bidisperse dense granular flows

Deepak R. Tunuguntla, Anthony R. Thornton

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
37 Downloads (Pure)

Abstract

Several experimental studies have illustrated a balance between the segregation forces arising due to size- and density-differences. However, no detailed studies have been carried out to quantify this balance. In 2014, by utilising discrete particle simulations, we presented a simple relationship between the particle size- and density-ratio, $s^a = \hat \rho$, where 'a' determines whether the partial pressure scales with the diameter, surface area or volume of the particle. For a 50:50 mix (in volume) of bidisperse granular mixtures, we found the partial pressure to scale with the volume of the particle, i.e. a = 3. Moreover, there also exists a range of size- and density-ratios that satisfy the relation $s^3 = \hat \rho$, where the bidisperse mixture remains homogeneously mixed. However, in this proceeding, we deviate from the conventional 50:50 mixes and consider a slightly extreme case of mixes, such as the 10:90 (in volume) mixes, which are often found in nature and industries. By doing so we observe that the partial pressure does not scale with the particle volume and, more importantly, the zero-segregation relation is not as simple as $s^a = \hat \rho$. However, there does exist a range of size- and density-ratios for which the mixture weakly segregates.

Original languageEnglish
Article number03079
JournalEPJ Web of Conferences
Volume140
DOIs
Publication statusPublished - 30 Jun 2017
Event8th International Conference on Micromechanics on Granular Media, Powders & Grains 2017 - Montpellier, France
Duration: 3 Jul 20177 Jul 2017
Conference number: 8
http://pg2017.org/en/

Fingerprint

partial pressure
industries
simulation

Cite this

@article{9fd3f4818ee8431a8b9991036cae4b13,
title = "Balancing size and density segregation in bidisperse dense granular flows",
abstract = "Several experimental studies have illustrated a balance between the segregation forces arising due to size- and density-differences. However, no detailed studies have been carried out to quantify this balance. In 2014, by utilising discrete particle simulations, we presented a simple relationship between the particle size- and density-ratio, $s^a = \hat \rho$, where 'a' determines whether the partial pressure scales with the diameter, surface area or volume of the particle. For a 50:50 mix (in volume) of bidisperse granular mixtures, we found the partial pressure to scale with the volume of the particle, i.e. a = 3. Moreover, there also exists a range of size- and density-ratios that satisfy the relation $s^3 = \hat \rho$, where the bidisperse mixture remains homogeneously mixed. However, in this proceeding, we deviate from the conventional 50:50 mixes and consider a slightly extreme case of mixes, such as the 10:90 (in volume) mixes, which are often found in nature and industries. By doing so we observe that the partial pressure does not scale with the particle volume and, more importantly, the zero-segregation relation is not as simple as $s^a = \hat \rho$. However, there does exist a range of size- and density-ratios for which the mixture weakly segregates.",
author = "Tunuguntla, {Deepak R.} and Thornton, {Anthony R.}",
year = "2017",
month = "6",
day = "30",
doi = "10.1051/epjconf/201714003079",
language = "English",
volume = "140",
journal = "EPJ Web of Conferences",
issn = "2100-014X",
publisher = "EDP Sciences",

}

Balancing size and density segregation in bidisperse dense granular flows. / Tunuguntla, Deepak R.; Thornton, Anthony R.

In: EPJ Web of Conferences , Vol. 140, 03079, 30.06.2017.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Balancing size and density segregation in bidisperse dense granular flows

AU - Tunuguntla, Deepak R.

AU - Thornton, Anthony R.

PY - 2017/6/30

Y1 - 2017/6/30

N2 - Several experimental studies have illustrated a balance between the segregation forces arising due to size- and density-differences. However, no detailed studies have been carried out to quantify this balance. In 2014, by utilising discrete particle simulations, we presented a simple relationship between the particle size- and density-ratio, $s^a = \hat \rho$, where 'a' determines whether the partial pressure scales with the diameter, surface area or volume of the particle. For a 50:50 mix (in volume) of bidisperse granular mixtures, we found the partial pressure to scale with the volume of the particle, i.e. a = 3. Moreover, there also exists a range of size- and density-ratios that satisfy the relation $s^3 = \hat \rho$, where the bidisperse mixture remains homogeneously mixed. However, in this proceeding, we deviate from the conventional 50:50 mixes and consider a slightly extreme case of mixes, such as the 10:90 (in volume) mixes, which are often found in nature and industries. By doing so we observe that the partial pressure does not scale with the particle volume and, more importantly, the zero-segregation relation is not as simple as $s^a = \hat \rho$. However, there does exist a range of size- and density-ratios for which the mixture weakly segregates.

AB - Several experimental studies have illustrated a balance between the segregation forces arising due to size- and density-differences. However, no detailed studies have been carried out to quantify this balance. In 2014, by utilising discrete particle simulations, we presented a simple relationship between the particle size- and density-ratio, $s^a = \hat \rho$, where 'a' determines whether the partial pressure scales with the diameter, surface area or volume of the particle. For a 50:50 mix (in volume) of bidisperse granular mixtures, we found the partial pressure to scale with the volume of the particle, i.e. a = 3. Moreover, there also exists a range of size- and density-ratios that satisfy the relation $s^3 = \hat \rho$, where the bidisperse mixture remains homogeneously mixed. However, in this proceeding, we deviate from the conventional 50:50 mixes and consider a slightly extreme case of mixes, such as the 10:90 (in volume) mixes, which are often found in nature and industries. By doing so we observe that the partial pressure does not scale with the particle volume and, more importantly, the zero-segregation relation is not as simple as $s^a = \hat \rho$. However, there does exist a range of size- and density-ratios for which the mixture weakly segregates.

UR - http://www.scopus.com/inward/record.url?scp=85024123973&partnerID=8YFLogxK

U2 - 10.1051/epjconf/201714003079

DO - 10.1051/epjconf/201714003079

M3 - Article

VL - 140

JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

SN - 2100-014X

M1 - 03079

ER -