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Granular flow transitions on sinusoidal surfaces

Published online by Cambridge University Press:  24 May 2006

CARLOS E. CAICEDO-CARVAJAL ,
BENJAMIN J. GLASSER  and
TROY SHINBROT
CARLOS E. CAICEDO-CARVAJAL
Affiliation:
Department of Biomedical Engineering, Rutgers University, Piscataway, NJ 08855, USA
BENJAMIN J. GLASSER
Affiliation:
Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway, NJ 08855, USA
TROY SHINBROT
Affiliation:
Department of Biomedical Engineering, Rutgers University, Piscataway, NJ 08855, USA
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Abstract

We report on a newly discovered bifurcation that occurs in dry grains flowing down a chute with a wavy bottom. We find that the bifurcation outwardly resembles the long-known fluid analogue of inviscid channel flow over a wavy bottom reported in 1886 by Lord Kelvin; however, in detail, the two situations differ significantly. We compare three distinct states seen in the granular system: a ‘regular’ flow in phase with the bottom wave; an ‘antiregular’ flow that is out of phase; and a ‘flat’ flow in which the surface slides nearly uniformly downhill. Additionally, we discuss evidence that sustained subsurface circulation in the granular bed, accompanied by strong fluctuations in flow velocities, can appear in granular flows over wavy surfaces.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 556 , 10 June 2006 , pp. 253 - 269
Copyright
© 2006 Cambridge University Press

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