CONICET | Buscador de Institutos y Recursos Humanos

tWe performed experiments to determine the critical moment for movement initiation of a millimeterbead on a rotating rough surface. The corresponding critical angular velocities were measured for glassand stainless-steel ball bearings over two different rough surfaces with glued glass beads. A basic the-oretical analysis was developed to explain the observed results. Although the expectation of a simpleapproach with the presence of the obstacles offered by a rough surface could be sufficient to describe theproblem, we prove here that the sole consideration of these obstacles, and even friction, are insufficientto explain the results in the range of a few-millimeter glass particles. Where the thermodynamic workof adhesion between surfaces is significant, the adhesion forces must be considered in the force balancefor particle detachment. This effect is a determinant for describing theoretically and numerically thedynamics of millimeter particles.

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