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Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Sep;72(3 Pt 1):031307. Epub 2005 Sep 28.

Archimedes' principle in fluidized granular systems.

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Departamento de Física Aplicada, CINVESTAV-Mérida, A. P. 73 Cordemex, Mérida, Yucatán 97310, Mexico.


We fluidize a granular bed in a rectangular container by injecting energy through the lateral walls with high-frequency sinusoidal horizontal vibrations. In this way, the bed is brought to a steady state with no convection. We measured buoyancy forces on light spheres immersed in the bed and found that they obey Archimedes' principle. The buoyancy forces decrease when we reduce the injected energy. By measuring ascension velocities as a function of gamma, we can evaluate the frictional drag of the bed; its exponential dependence agrees very well with previous findings. Rising times of the intruders ascending through the bed were also measured, they increase monotonically as we increase the density.


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