Agglomeration of wet particles in dense granular flows

Vo, Tam; Nezamabadi, Saeid; Mutabaruka, Patrick; Delenne, Jean‐Yves; Izard, Edouard; Pellenq, Roland J.‐M.; Radjaï, Farhang

doi:10.1140/epje/i2019-11892-9

Cited by 18 publications

(4 citation statements)

References 79 publications

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“…During the agglomeration process, the initial stage of nucleation and consolidation of an agglomerate involves the diffusion and redistribution of the liquid [59]. Once an agglomerate is formed, it can be assumed that the liquid is mainly carried by wet particles [15]. Consistently, the particles are assumed to be covered by the liquid so that the contact angle equals zero independently of liquid viscosity.…”

Section: A Numerical Methodsmentioning

confidence: 99%

“…Once nucleated, the agglomerates interact with their surrounding granular material. The evolution of the agglomerates and their effect on the soil or powder behavior depends on the nature of these interactions [3,[9][10][11][12][13][14][15]. There are two limit cases: (i) The agglomerate survives by keeping its shape and primary particles if its internal cohesion σ c is high due to strong cohesive bonds as compared to the forces exerted by dry granular flow around the agglomerate, and (ii) the agglomerate spontaneously disintegrates if the cohesive bonds are weak.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of wet agglomerates inside inertial shear flow of dry granular materials

Mutabaruka

Nezamabadi

et al. 2020

Phys. Rev. E

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We use particle dynamics simulations to investigate the evolution of a wet agglomerate inside homogeneous shear flows of dry particles. The agglomerate is modeled by introducing approximate analytical expressions of capillary and viscous forces between particles in addition to frictional contacts. During shear flow, the agglomerate may elongate, break, or be eroded by loss of its capillary bonds and primary particles. By systematically varying the shear rate and surface tension of the binding liquid, we characterize the rates of these dispersion modes. All the rates increase with increasing inertial number of the flow and decreasing cohesion index of the agglomerate. We show that the data points for each mode collapse on a master curve for a dimensionless scaling parameter that combines the inertial number and the cohesion index. The erosion rate vanishes below a cutoff value of the scaling parameter. This leads to a power-law borderline between the vanishing erosion states and erosion states in the phase space defined by the inertial number and the cohesion index.

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Section: A Numerical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution of wet agglomerates inside inertial shear flow of dry granular materials

Mutabaruka

Nezamabadi

et al. 2020

Phys. Rev. E

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“…Wet granular materials are omnipresent in nature, industrial processes, and engineering applications [1][2][3]. In which, wet granules or cohesive power mixtures are known as products of mixing water or adhesives and raw materials with different material properties such as size polydispersity, density, and roughness [4][5][6][7][8]. Basically, the increase of the size polydispersity leads to the enhancement of the granule strength [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effects of the size polydispersity and friction coefficient on the compressive strength of wet granular materials

Nguyen

2023

STCE

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We numerically study the effects of the size polydispersity and the friction coefficient on the compressive strength of wet granules under a diametrical compression test by using discrete element simulations. The nu-merical method is coupled with the capillary cohesion law which is enhanced by the cohesive forces between grains in the pendular regime. The wet granules are composed of primary spherical particles whose size poly-dispersity is varied from1 to 10 and the friction coefficient between grains is varied from0.1 to 1.0. By applying a constant compression velocity on the top plate in quasi-static regime, the granule is deformed but does not abruptly rupture due to the cohesive effects between grains and the rearrangement of primary particles. This no abrupt rupture is characterized by the appearance of the peak compressive stress in a long vertical strain before the onset failure of the granule. The compressive strength of the granule increases with increasing the friction coefficient for all cases of the size polydispersity but seemly declines for low values of the size polydispersity and almost level-off for high-size polydispersity with the friction coefficient larger than 0.5.

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“…4. As an in-house Discrete Element Method (DEM) code program, which is originally built by P. Mutabaruka, then developed and improved by the authors to investigate the physical and mechanical responses of granular materials in nature and industry [12][13][14]. In DEM, each grain is considered as rigid particle and interacts with its surrounding particles under the frictional elastic interaction force law [15].…”

Section: Introductionmentioning

confidence: 99%

Linking dynamics between anchors and granular materials

Vo,

Nguyen

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The research quantitatively explores the linking properties between the circular plate anchor and the granular assembly during the failure process under the subject of a specified pullout force given to the anchor using three-dimensional discrete particle simulations. This circular anchor is created as a hard cluster of spherical grains and is initially buried at a depth in the granular assembly. The numerical method is constructed based on the frictional interaction force law. The linking dynamic is characterized by the variation of the drag force acting on such anchor due to interaction with grains at the bottom of the frustum which is formed during the uplifting movement of the anchor. The results show that the drag force acting on the anchor first reaches a nearly constant value corresponding to the loading phenomenon at small anchor movement, reflecting the plastic deformation of granular bed as a result of particle rearrangement, and then fluctuates in a wide range, this range increases with increasing the anchor movement as a result of the unloading/reloading events. These loading/unloading/reloading events provide evidence for the linking properties between the anchor movement and granular assembly, which are highlighted by the density and intensity of force network within the frustum.

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Agglomeration of wet particles in dense granular flows

Cited by 18 publications

References 79 publications

Evolution of wet agglomerates inside inertial shear flow of dry granular materials

Evolution of wet agglomerates inside inertial shear flow of dry granular materials

Effects of the size polydispersity and friction coefficient on the compressive strength of wet granular materials

Linking dynamics between anchors and granular materials

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