TY - JOUR
T1 - Granular axial band formation in rotating tumblers
T2 - A discrete element method study
AU - Chen, Pengfei
AU - Ottino, Julio M.
AU - Lueptow, Richard M.
PY - 2011/5
Y1 - 2011/5
N2 - The onset mechanism for band formation of a granular mixture in long rotating tumblers is still largely unresolved. We study this issue for axial segregation of binary mixtures having different size particles, using discrete element method simulations. Endwalls initiate axial segregation via an axial flow due to friction. The non-uniform distribution of axial velocity in the flow together with simultaneous radial segregation via percolation results in the axial flow rate of the two types of particles differing in the upstream and downstream portions of the flowing layer. Thus, small particles are driven further from the endwalls, while large particles accumulate at the endwalls. Once this occurs, a cascading mechanism begins so that other bands form due to the gradient in particle concentration near the endwalls. A small axial flow between segregated bands of small and large particles persists even after the bands are fully developed.
AB - The onset mechanism for band formation of a granular mixture in long rotating tumblers is still largely unresolved. We study this issue for axial segregation of binary mixtures having different size particles, using discrete element method simulations. Endwalls initiate axial segregation via an axial flow due to friction. The non-uniform distribution of axial velocity in the flow together with simultaneous radial segregation via percolation results in the axial flow rate of the two types of particles differing in the upstream and downstream portions of the flowing layer. Thus, small particles are driven further from the endwalls, while large particles accumulate at the endwalls. Once this occurs, a cascading mechanism begins so that other bands form due to the gradient in particle concentration near the endwalls. A small axial flow between segregated bands of small and large particles persists even after the bands are fully developed.
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U2 - 10.1088/1367-2630/13/5/055021
DO - 10.1088/1367-2630/13/5/055021
M3 - Article
AN - SCOPUS:79958863357
SN - 1367-2630
VL - 13
JO - New Journal of Physics
JF - New Journal of Physics
M1 - 055021
ER -