Discharge flow of a granular media from a silo: effect of the packing fraction and of the hopper angle Mebirika Benyamine, Pascale Aussillous and Blanche Dalloz-Dubrujeaud EPJ Web Conf., 140 (2017) 03043 Published online: 30 June 2017 DOI: 10.1051/epjconf/201714003043