TY - JOUR
T1 - Granular flow transitions on sinusoidal surfaces
AU - Caicedo-Carvajal, Carlos E.
AU - Glasser, Benjamin J.
AU - Shinbrot, Troy
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006/6/10
Y1 - 2006/6/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=33744937623&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33744937623&partnerID=8YFLogxK
U2 - 10.1017/S0022112006009542
DO - 10.1017/S0022112006009542
M3 - Article
AN - SCOPUS:33744937623
VL - 556
SP - 253
EP - 269
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
SN - 0022-1120
ER -