Drag in wet granular materials

Artoni, Riccardo; Loro, Giovanni; Richard, Patrick; Gabrieli, Fabio; Santomaso, Andrea C.

doi:10.1016/j.powtec.2019.08.016

Cited by 13 publications

(4 citation statements)

References 26 publications

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“…Several experiments were led in the presence of an interstitial fluid. When the material is not saturated, the velocity dependence on the drag force is similar to the dry case, although mechanisms such as cohesion and contact lubrication have an influence [9]. On the other hand, when the grains are fully immersed, the buoyancy due to the fluid decreases the apparent weight of the grains.…”

Section: Introductionmentioning

confidence: 94%

Numerical analysis of the drag on a rigid body in an immersed granular flow

et al. 2021

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The drag exerted on an object moving in a granular medium is subject to many studies: in dry grains, it depends on the stress -often due to gravity -inside the grains. For Froude numbers less than 10, the drag is independent of the velocity. In immersed grains, it is proportional to the apparent weight of the grains and it depends on both velocity and fluid viscosity. In this paper, the drag on a cylinder in dry and immersed granular flow is simulated with a multi-scale FEM-DEM model. The Janssen stress saturation effect before the flow and velocity independence of the drag are both reproduced. The semi-circular orientation of the stress field supports the hypothesis of a spherical zone of influence of the cylinder. This orientation does not significantly change upon flowing. The results show the velocity independence of the drag is due to particle friction. In the immersed case, the fluid contribution is negligible on its own. A dimensional analysis suggests that shear thickening should be taken into account. The transition between the quasi-static and the fluidized regime is accompanied by a decrease of the stress field downstream of the cylinder and a change in the shape of the shear zone. KeywordsGranular drag • Janssen effect • Nonsmooth contact dynamics • Unresolved model • MigFlow B Nathan Coppin

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Section: Introductionmentioning

confidence: 94%

Numerical analysis of the drag on a rigid body in an immersed granular flow

et al. 2021

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“…One wet case was considered for simplicity, and the amount of water to be added was chosen considering that water induces cohesion, but above a certain amount of liquid, lubrication effects become important, and therefore act in the oppposite sense. Considering the size and shape of the particles, the optimal water amount is around a few percent of the mass of the sample (Artoni et al, 2019). Consequently, tests for mixing and vertical taps were performed by adding 4% water of the total weight of the mixture used.…”

Section: Effect Of Water Additionmentioning

confidence: 99%

Segregation of sand-rubber chips mixtures subject to vertical tapping under confinement

et al. 2021

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“…[12,13] These intrinsic dependences make the mechanical properties of wet particles extremely complicated. [13][14][15][16] When wet particles become saturated, the capillary effects will disappear. The buoyancy of the liquid around saturated particles attenuates the particles' gravity.…”

Section: Introductionmentioning

confidence: 99%

Resistance law of a rod penetrating a multilayer granular raft

Li¹,

Tian²,

Hu³

2023

Chinese Phys. B

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This paper presents an experimental study on the resistance law of a rod vertically penetrating different kinds of multilayer granular rafts with a constant velocity so as to reveal the mechanical properties of the multilayer granular rafts. The resistance was quasi-static under the chosen velocity. Experiments were conducted with different granular thicknesses, rod diameters and combinations of particles and liquids. The study shows that the resistance-displacement relation of the rod has three smooth stages. In the first stage, the resistance rapidly increased. In the second stage, the resistance curve maintained an almost constant slope. In the third stage, the resistance smoothly changed with its slope continuously increasing. Based on the corresponding physical models for each stage, the study reveals the exponential dependence of the load-bearing capacity of the multilayer granular raft on its thickness, and clarifies the capillary effects on the resistance law. The study extends the knowledge of the granular raft from monolayer to multilayer structure.

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Drag in wet granular materials

Cited by 13 publications

References 26 publications

Numerical analysis of the drag on a rigid body in an immersed granular flow

Numerical analysis of the drag on a rigid body in an immersed granular flow

Segregation of sand-rubber chips mixtures subject to vertical tapping under confinement

Resistance law of a rod penetrating a multilayer granular raft

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