Granular species segregation under vertical tapping: effects of size, density, friction, and shaking amplitude.
We present extensive molecular dynamics simulations on species segregation in a granular mixture subject to vertical taps. We discuss how grain properties, e.g., size, density, friction, as well as shaking properties, e.g., amplitude and frequency, affect such a phenomenon. Both the Brazil nut effect (larger particles on the top, BN) and the reverse Brazil nut effect (larger particles on the bottom, RBN) are found and we derive the system comprehensive "segregation diagram" and the BN to RBN crossover line. We also discuss the role of friction and show that particles which differ only for their frictional properties segregate in states depending on the tapping acceleration and frequency.
Dipartimento di Scienze Fisiche, Universitá di Napoli Federico II, Coherentia-CNR, INFN, CRdC AMRA, Napoli, Italy. picaciamarra@na.infn.it
Massimo Pica
MP
Ciamarra
Maria Domenica
MD
De Vizia
Annalisa
A
Fierro
Marco
M
Tarzia
Antonio
A
Coniglio
Mario
M
Nicodemi