The importance of a velocity-dependent friction coefficient in representing the flow behaviour of a blade-driven powder bed

Khala, Marv J.; Hare, Colin; Murtagh, Martin J.; Venugopal, Navin; Freeman, Tim

doi:10.1016/j.powtec.2021.02.060

Cited by 1 publication

(1 citation statement)

References 29 publications

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“…In addition, we found that for the range of velocities possible to impose with the stage, the force curves present insignificant changes (Fig. 2(d-e)) indicating that these experiments are in the quasi-static granular force regime [37][38][39][40] . This observation is consistent with the estimate of the Froude number which is Fr = v/ g(h + D/2) ≈ 0.0040±0.0015 i.e.…”

Section: Methodsmentioning

confidence: 81%

Anisotropic frictional model for an object sliding in a granular media

Zuñiga,

Vasconcellos,

Darbois Texier

et al. 2024

Physics of Fluids

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Several locomotion strategies are based on the anisotropic nature of the forces experienced by the moving body with its environment. We report experiments on the anisotropy of the frictional force experienced by a cylinder moving in a granular medium as a function of the orientation α between the cylinder and its velocity. The component of the force in the direction parallel to the velocity of the cylinder is always higher than the perpendicular component; therefore, the force is anisotropic. While the parallel component increases continuously with the cylinder angle α, we observe that the perpendicular component reaches a maximum value for an orientation of αc≃35°. To rationalize these observations, we have developed a theoretical model, which assumes that the mechanical energy required to move the cylinder is dissipated by friction and establishes a relationship between the parallel and perpendicular force components that is consistent with experiments.

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Section: Methodsmentioning

confidence: 81%