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A simple demonstration of granular phases

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Uploaded on Feb 6, 2010

Steel spheres move on a plate. The "thermostat " is a vibrating wall, following a sine law with frequency 20 Hz . Weak gravity (the plate has a small angle of inclination) draws the spheres toward the vibrating wall. In 5 minutes, slowly increasing the amplitude, the many "phases" of a granular material are explored, from an almost perfect crystal, through several liquid/turbulent/convective regimes, up to a gas-solid coexistence. (This prototype has been realized by Franco Bagnoli and Alessio Guarino at the Dipartimento di Energetica, Firenze)

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