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Discharge flow of a bidisperse granular media from a silo
M Benyamine1, M Djermane1, B Dalloz-Dubrujeaud2
1Laboratoire FIMAS, Université de Béchar, Boîte Postale 417, Béchar 08000, Algeria.
Abstract:
The discharge flow in a cylindrical and a rectangular silo using both monodisperse and bidisperse mixtures of spherical glass beads is studied experimentally. The flow rate is measured using a precision balance for a large range of particle diameters, size ratios, and outlet diameters. A simple physical model is proposed to describe the flow of bidisperse mixtures. It gives an expression for the flow rate and predicts that the bulk velocity follows a simple mixture law. This model implies that a mixture diameter cannot be simply defined. Moreover it is shown that bidisperse granular media allow for the transport of coarse particles below their jamming conditions.
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