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Communication Dans Un Congrès Année : 2024

Flow of a granular material through a forest of obstacles

Résumé

The inclined plane configuration is ideal for studying the rheology of granular materials under imposed-pressure conditions. We investigate this situation when a forest of obstacles is present in the path of the grains and thus affects the global flow properties of the material. Our experimental set-up consists of a plane which includes a forest of cylindrical pillars planted perpendicular to the plane and positioned at regular intervals. We quantified the influence of the inter-pillar distance on the stationary flow rate of the grains for different layer thicknesses and different angles of inclination. We observe that when the inter-pillar distance is reduced, the flow rate of the grains decreases and reaches a new regime where the flow rate is practically independent of the thickness of the grain layer. In order to rationalize these observations, we develop a model that is based on a depth-averaged approximation associated with the µ(I)-rheology and that considers the average force exerted by the pillars on the granular layer. This approach yields an effective rheology of the system composed by grains and obstacles and that depends on the ratio between the distance between the pillars and their diameter.
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Dates et versions

hal-04544446 , version 1 (12-04-2024)

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  • HAL Id : hal-04544446 , version 1

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Baptiste Darbois Texier. Flow of a granular material through a forest of obstacles. Annual European Rheology Conference 2024, European Society of Rheology, Apr 2024, Leeds, United Kingdom. ⟨hal-04544446⟩
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