2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28325The dynamics and the transition to the centrifugal regime are studied analytically and numerically for particles in rotating drum. The importance of the particle-wall friction coefficient is demonstrated by studying first the motion of one non-rotating particle where three different regimes are found in the transition to the centrifugal motion. When a few rotating particles are considered, they behave similarly to one non-rotating particle in the low friction limit. A critical particle number is necessary to reach the centrifugal regime for which an analytic expression is derived in the limit of negligible inter-particle friction.12 pages, 6 figures (using provided EPIC and EEPIC macros)Soft Condensed MatterStatistical Mechanicstext