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New patterns in high-speed granular flows

Published online by Cambridge University Press:  16 March 2015

Nicolas Brodu ,
Renaud Delannay ,
Alexandre Valance  and
Patrick Richard
Nicolas Brodu*
Affiliation:
Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes 1, Campus de Beaulieu, Bâtiment 11A, 263 Avenue Général Leclerc, 35042 Rennes CEDEX, France
Renaud Delannay
Affiliation:
Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes 1, Campus de Beaulieu, Bâtiment 11A, 263 Avenue Général Leclerc, 35042 Rennes CEDEX, France
Alexandre Valance
Affiliation:
Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes 1, Campus de Beaulieu, Bâtiment 11A, 263 Avenue Général Leclerc, 35042 Rennes CEDEX, France
Patrick Richard
Affiliation:
L’UNAM Université, IFSTTAR, GPEM, Site de Nantes, Route de Bouaye, 44344 Bouguenais CEDEX, France
*
†Email address for correspondence: nicolas@brodu.net
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Abstract

We report on new patterns in high-speed flows of granular materials obtained by means of extensive numerical simulations. These patterns emerge from the destabilization of unidirectional flows upon increase of mass holdup and inclination angle, and are characterized by complex internal structures, including secondary flows, heterogeneous particle volume fraction, symmetry breaking and dynamically maintained order. In particular, we evidenced steady and fully developed ‘supported’ flows, which consist of a dense core surrounded by a highly energetic granular gas. Interestingly, despite their overall diversity, these regimes are shown to obey a scaling law for the mass flow rate as a function of the mass holdup. This unique set of three-dimensional flow regimes raises new challenges for extending the scope of current granular rheological models.

JFM classification

Granular media: Granular media Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows Phase change: Phase change
Type
Papers
Information
Journal of Fluid Mechanics , Volume 769 , 25 April 2015 , pp. 218 - 228
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Copyright
© 2015 Cambridge University Press 

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