Ball-Bearing Effect on Shear Behavior of Binary Granular Mixture

Ueda, Takao; Matsushima, Takashi; Yamaguchi, Yasuo

doi:10.2208/jscejam.68.1

Cited by 3 publications

(2 citation statements)

References 18 publications

(12 reference statements)

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“…[23][24][25], that in large-and-small binary mixtures is also expected to be nearly proportional to the average diameter of the particle in the system as discussed in Ref. [8] in general. The average diameter, d ave , is defined as follows:…”

Section: Model Relating Flow Properties and Particle Contactsmentioning

confidence: 86%

“…Ref. [7,8]) but the results are again rather limited due to the high complexity of such systems, although this might potentially be a useful approach with further improvements of computational speed and modelling techniques in the near future. The current study aims to address the gap between experimental measurements and numerical simulations towards the ultimate goal of an improved understanding of their linkage.…”

Section: Introductionmentioning

confidence: 99%

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A semi-empirical model relating flow properties to particle contacts in fine binary powder mixtures

Kojima

Elliott

2014

Powder Technology

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Binary powder mixtures, consisting of large and small diameter particles, are used in electrophotographic (EP) printing devices where control of the relationship between the flow properties and mixing ratio is of great importance. In this study, we have experimentally investigated the bulk flow properties (i.e. bulk cohesion and internal friction) of large-and-small fine binary powder mixtures (size ratio: d l /d s = 9.17) as a function of the volume ratio of the smaller component, x s . Using polymer spheres as the smaller constituents, whose bulk cohesion was controlled by surface additives, we have obtained systematic data on the effect of the smaller constituent. A semi-empirical model was then developed, in which the total bulk cohesion is expressed as a linear superposition of the numbers of the three types of particle-particle contacts (i.e. large-large, small-small, and largesmall) involved in the shear motion. The model successfully reproduced the experimental data after fitting appropriate values of a parameter representing the adhesion at large-small particle contacts. The rapid increase of the number of particles involved in the shear motion as a function of x s near x s = 0 was also considered in the model. The model clarifies the contributions of the three types of particle-particle contacts to the total bulk flow properties. The effect of large-small particle contacts on the bulk cohesion was observed for almost all values of x s . The value of x s at which the contribution of large-small particle contacts in the total bulk cohesion becomes a maximum shifted in the direction of larger x s when a less cohesive small powder was used. This also resulted in a shift of x s at which the internal friction reached a minimum.

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Section: Model Relating Flow Properties and Particle Contactsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

A semi-empirical model relating flow properties to particle contacts in fine binary powder mixtures

Kojima

Elliott

2014

Powder Technology

View full text Add to dashboard Cite

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Micromechanical observation of kinematics of sheared circular discs

Ali,

Kikumoto,

Cui

et al. 2024

E3S Web of Conf.

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Particle rolling is an essential microscopic mechanism that governs macroscopic behavior. This study conducts biaxial shearing tests on bi-dispersed circular discs at different confining pressures. A novel 2D image analysis technique is employed to measure the rolling of all the particles. It is observed that most of the particles exhibit significant rolling during shearing. Rollings are normally distributed in clockwise and counterclockwise directions, and the net rolling of the granular assembly is almost zero. Generally, the rolling of a particle is accompanied by its neighboring particle’s opposite rolling in a similar magnitude. In some cases, a group of particles is observed to exhibit rolling in the same direction, accompanied by another opposite rolling group in the neighboring regions. Particles inside the shear band tend to show significant rolling. The rolling rate is prominent at the beginning of the shearing and gradually decreases towards the end. Small particles exhibit significantly higher rotations, while larger particles are relatively resistant to rolling. Small particles work as ball bearings between two big particles, reducing the shear strength of the granular materials. The experimental data obtained in this study can be used to perform detailed validation of numerical models to simulate realistic granular behavior such as DEM.

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