The role of rotational inertia in the dynamics of vibrofluidised granular gases
School of Physics and Astronomy, University of Birmingham - Edgbaston, Birmingham B15 2TT, UK
Received: 21 August 2014
Accepted: 20 November 2014
The effect of particle shape on the properties of granular systems is a matter of great relevance to many diverse fields, yet remains incompletely understood. While the geometry of a particle determines a number of its physical properties, in this study, we isolate the influence of the moment of inertia possessed by a particle on its dynamical behaviour. Through the application of positron emission particle tracking, we experimentally investigate vibrofluidised granulates comprising particles of varying rotational inertia. We demonstrate that beds composed of particles with greater rotational inertia consistently obtain higher translational kinetic energies than those comprising particles with lower angular mass. This observation is shown to be robust over a range of system parameters, and a mechanism explaining the newly observed behaviour is proposed.
PACS: 81.05.Rm – Porous materials; granular materials / 45.70.-n – Granular systems / 34.50.Ez – Rotational and vibrational energy transfer
© EPLA, 2014