Abstract
Motivated by an application to nuclear safety, we studied the effect of an imposed gas over-pressure on the discharge flow of granular media from a cylindrical silo. The size and type of particles and surrounding fluid where discharge occurs were varied, using air and water to test a coolant fluid for nuclear safety. Particle and air flow rates are found to increase during discharge with constant over-pressure conditions. A two-phase continuum model is used with a frictional rheology for particle-particle interactions. This model is solved numerically and we propose a simple quasi-steady analytical model with the air-pressure gradient at the orifice as a driving force in addition to gravity.
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