To
reveal the local percolation characteristics of a binary particle
mixture in a rectangular hopper with inclined bottom, the discrete
element method (DEM) is used to simulate the discharging process.
A local percolation evaluation method is proposed, and the percolation
strength grid maps are drawn. The effects of geometric parameters,
particle properties, and interaction parameters on percolation are
investigated. Apart from the free surface, percolation is mainly concentrated
near the wall and at the bottom. With the increase in the orifice
width, the average local percolation strength index (ALPSI) of the
near-wall region increases and that of the bottom region decreases.
The effect of the angle on percolation in the near-wall region can
be ignored. The effect of friction on local percolation is significant.
Increasing the fine particle mass fraction and reducing the difference
in particle size can effectively avoid percolation.
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