The evolution mechanism of discharge velocity profiles and force chain distribution of maize particles in silos was studied based on the interaction between internal and external rolling friction of particles. Through EDEM, the silo and maize grain models were established for unloading simulation, whose flow pattern was compared with the silo unloading test to verify the rationality of the simulation. By slice observation, we compared and analyzed the time evolution rules of particle mesoscopic parameters under different friction conditions. The results show that the larger the interparticle friction coefficient is, the longer the total discharge time is and the smaller the coefficient of rolling friction between particles, the earlier the particle flow from mass flow to funnel flow. For silos with the funnel, the reduction of interparticle friction will change the limit between the mass flow and the funnel flow, thus increasing the area of the funnel flow. When the coefficient of rolling friction increases, the vertical velocity and angular velocity of the particle near the silo middle increase. However, the effects of internal and external friction coupling on the vertical velocity of the side particle, the horizontal velocity of the whole particle, and the spatial distribution and probability distribution of the force chain are more significant.

中文翻译：

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摩擦耦合对筒仓中玉米颗粒流速分布和力链分布的影响

基于颗粒内，外滚动摩擦的相互作用，研究了筒仓中玉米颗粒出料速度分布和力链分布的演化机理。通过EDEM，建立了筒仓和玉米谷物模型用于卸载模拟，将其流型与筒仓卸载试验进行了比较，以验证模拟的合理性。通过切片观察，比较和分析了不同摩擦条件下颗粒介观参数的时间演化规律。结果表明，颗粒间摩擦系数越大，总排出时间越长，颗粒间的滚动摩擦系数越小，颗粒从质量流向漏斗流的时间越早。对于带有漏斗的筒仓，颗粒间摩擦的减小将改变质量流和漏斗流之间的界限，从而增加漏斗流的面积。当滚动摩擦系数增加时，筒仓中部附近颗粒的垂直速度和角速度增加。但是，内部和外部摩擦耦合对侧粒子的垂直速度，整个粒子的水平速度以及力链的空间分布和概率分布的影响更为显着。