In a numerical simulation of the solid-liquid two-phase flow in pumps, the conventional approach is to treat solid particles as a kind of quasi-fluid, using the CFD in the multiphase flow case, but in this way, the characteristics of the solid particles, such as the shape and size, the collision, the agglomeration and the separation, can not be reasonably represented. In this paper, the unsteady solid-liquid two-phase flow in an IS type centrifugal pump is simulated numerically, using the discrete element method (DEM) combined with the CFD method. With the coupling of the codes of the EDEM and the Fluent, the motions of the solid particles and their effects on the pump performance are investigated. In the simulation, the solid particles are 1500 kg/m3 in density, 15% in the volume rate at the pump inlet, 1.0-3.0 mm in sizes in a random distribution. Some valuable conclusions are reached, including the time-dependent head, the particle trajectories and the solid volume rate distributions in the centrifugal pump.
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