Schaller, F.M.Punzmann, HorstSchröder-Turk, Gerd E.Saadatfar, MohammadRadjai F.Delenne J.Y2020-12-202020-12-203 July 201http://hdl.handle.net/1885/218560In this paper, we report experimental results on granular compaction in a model system made of mono- and bidisperse ellipsoidal packings as well as sand packings with grain size polydispersity. The packings are subject to vertical tapping of varying duration (number of taps) and their internal three-dimensional structure is obtained using x-ray computed tomography. Particles positions and orientations are reconstructed and the global packing densities are computed. The analysis of the vertical and horizontal local packing fraction profiles reveal a homogeneous densification in the ellipsoidal packings, however, sand packings exhibit radial density gradient, possibly linked to the onset of convection.application/pdfen-AU201710.1051/epjconf/2017140060302020-11-23