Incompressible-compressible transition in falling granular jets

PRADO, , Gaël; AMAROUCHENE, Yacine; KELLAY, Hamid

doi:10.1209/0295-5075/102/24006

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PRADO, , Gaël
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

AMAROUCHENE, Yacine
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

KELLAY, Hamid
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Ce document a été publié dans

EPL - Europhysics Letters. 2013, vol. 102, n° 2, p. 2406

European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing

Résumé en anglais

Through a systematic experimental investigation of the behavior of falling granular jets under the action of gravity for different particle sizes, funnel diameters and ambient air pressures, necessary conditions to obtain incompressible granular jets are identified. A transition from compressible (characterized by a significant density decrease along the propagation) to incompressible granular jets (characterized by a constant density) is observed. This transition depends solely on the aspect ratio between the diameter of the particles and the diameter of the funnel. Surprisingly, the incompressible liquid-like behavior observed here seems to find its origin in the balance between the heat flux and the dissipation in the funnel independently of the ambient fluid pressure. A simple granular hydrodynamic model provides a good description of the transition.< Réduire

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