### 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 language | English |
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Article number | 03079 |

Journal | EPJ Web of Conferences |

Volume | 140 |

DOIs | |

Publication status | Published - 30 Jun 2017 |

Event | 8th International Conference on Micromechanics on Granular Media, Powders & Grains 2017 - Montpellier, France Duration: 3 Jul 2017 → 7 Jul 2017 Conference number: 8 http://pg2017.org/en/ |

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*EPJ Web of Conferences*,

*140*, [03079]. https://doi.org/10.1051/epjconf/201714003079

}

*EPJ Web of Conferences*, vol. 140, 03079. https://doi.org/10.1051/epjconf/201714003079

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

Research output: Contribution to journal › Article › Academic › peer-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 -