Granular flow through a vertical axisymmetric pipe

Islam, Mudasir ul; Jenkins, James T.; Das, Sovan Lal

doi:10.1103/physrevfluids.8.l072301

Phys. Rev. Fluids

2023

DOI: 10.1103/physrevfluids.8.l072301

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Granular flow through a vertical axisymmetric pipe

Mudasir ul Islam

James T. Jenkins

Sovan Lal Das

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2024

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Cited by 1 publication

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Elasticity and rheology of auxetic granular metamaterials

Haver,

Acuña,

Janbaz

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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The flowing, jamming, and avalanche behavior of granular materials is satisfyingly universal and vexingly hard to tune: A granular flow is typically intermittent and will irremediably jam if too confined. Here, we show that granular metamaterials made from particles with a negative Poisson’s ratio yield more easily and flow more smoothly than ordinary granular materials. We first create a collection of auxetic grains based on a re-entrant mechanism and show that each grain exhibits a negative Poisson’s ratio regardless of the direction of compression. Interestingly, we find that the elastic and yielding properties are governed by the high compressibility of granular metamaterials: At a given confinement, they exhibit lower shear modulus, lower yield stress, and more frequent, smaller avalanches than materials made from ordinary grains. We further demonstrate that granular metamaterials promote flow in more complex confined geometries, such as intruder and hopper geometries, even when the packing contains only a fraction of auxetic grains. Moreover, auxetic granular metamaterials exhibit enhanced impact absorption. Our findings blur the boundary between complex fluids and metamaterials and could help in scenarios that involve process, transport, and reconfiguration of granular materials.

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Elasticity and rheology of auxetic granular metamaterials

Haver,

Acuña,

Janbaz

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

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Granular flow through a vertical axisymmetric pipe

Cited by 1 publication

References 26 publications

Elasticity and rheology of auxetic granular metamaterials

Elasticity and rheology of auxetic granular metamaterials

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