DEM simulation of silo discharge of wet granular materials based on liquid bridge model
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Abstract:
This paper presented two numerical methods(contact constitutive model and user-defined constitutive model)to simulate the liquid bridge force of wet granular materials with small amount of liquid during silo discharge. The discrete element methods was employed to analyze the impact of liquid bridge force and moisture content on the granular fluidity. By the analysis of the differences of the macro-features between dry particles and wet particles, according to the observations of the peak pressure at the bottom of the silo and the jamming probability of particles, we came to the conclusion that the peak pressure at the bottom of the silo appeared during the discharge process and the peak pressure of dry particles was higher than that of wet particles. In the process of silo discharge, the jamming probability of particles with uniform particle size distribution was greater than that of single particle size, and the jamming probability of wet particles was larger than that of dry particles. And the liquid bridge force had a hindrance to the particle flow. The results demonstrate the feasibility and effectiveness of the proposed methods for modeling the flow behaviors of the wet granular materials.
