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有别于以往对颗粒团聚问题宏观而粗略的研究,提出从微观受力的角度探索颗粒团聚及破碎的机理。对循环流化床内运动颗粒的全受力分析表明,一般流化条件下,影响颗粒团聚及破碎最主要的作用力为弹性力和vanderWaals力。通过建立基本的Newton运动学方程并结合材料力学可以推导出碰撞变形过程中弹性力和vanderWaals力随碰撞时间的变化规律;进一步对比两者在碰撞过程中的相对大小可对颗粒团聚和破碎的趋势进行力学解释。
Different from the previous macroscopic and rough research on the particle agglomeration problem, the mechanism of particle agglomeration and fracture is explored from the perspective of microscopic force. The full force analysis of moving particles in a circulating fluidized bed shows that under the normal fluidization conditions, the main forces affecting the particle agglomeration and crushing are elastic forces and van der Waals forces. Through the establishment of the basic Newton kinematics equation combined with the material mechanics, the variation law of elastic force and van der Waals forces with the collision time during the collision deformation process can be deduced. By comparing the relative sizes of the two during collision, the tendency of the particles to agglomerate and crush For mechanics explanation.