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通过实验和数值模拟研究了竖直振动管中颗粒的受激运动.将一直管插入静止的颗粒料层中,并在管内预填充一定高度的颗粒,对直管施加竖直振动.振动强度较弱时,管内的颗粒在重力作用下向下运动;当振动达到一定的强度时,管内颗粒不下降反而克服重力的作用向上运动,随着振动强度的进一步提高,即使不在管内预填充高于颗粒床层的颗粒,颗粒也会沿着振动管逆重力向上运动.颗粒的上升高度与运动速度强烈依赖于振动强度.通过高速相机记录颗粒和直管在单个振动周期内的运动,并结合离散元(DEM)法模拟管内颗粒的受力变化规律,给出了颗粒上升的机理.此研究对实现散体物料的定向输运提供了一种新方法.
The excited motion of the particles in the vertical vibrating tube was studied through experiments and numerical simulations, inserting the straight tube into the stationary granular material layer and pre-filling a certain height of the particles in the tube to exert vertical vibration on the straight tube. When the vibration reaches a certain intensity, the particles in the tube do not fall but overcome the action of gravity to move upwards. With the further increase of the vibration intensity, even if the tube is not pre-filled with particles higher than the particles Particles and particles in the bed will also move upwards along the vibrating tube against gravity. The rising height and moving speed of the particles strongly depend on the vibration intensity. The movement of the particles and the straight tube in a single vibration cycle is recorded by a high-speed camera, (DEM) was used to simulate the force variation of the particles in the tube, and the mechanism of particle ascending was given. This study provided a new method for the directional transport of bulk materials.