Attraction and repulsion between objects in a granular flow
Por:
Caballero-Robledo, G. A., Acevedo-Escalante, M. F., Mandujano, F., Malaga, C.
Publicada:
13 ago 2021
Resumen:
The objective of this work is the understanding of lift forces exerted
on two side-by-side intruders within a granular flow that is uniform
upstream. To this end, we have performed experiments that reveal
long-range attraction and repulsion depending on flow velocity and the
distance between intruders. We found an interesting correlation between
the asymmetry of flow velocity around the obstacles and the lift force,
although the understanding of this correlation rests as an open question
for future work. Additionally, a hydrodynamic model based on kinetic
theory for inelastic particles was solved numerically. The model
reproduces remarkably well the general qualitative features of the
experiments which shows that the system behaves similarly to a pair of
hot intruders immersed in a liquid of temperature-dependent viscosity.
However, quantitative discrepancies suggest that better constitutive
relations are needed.
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