深海矿物随机粗颗粒碰撞破碎仿真研究

NUMERICAL STUDY ON COLLISION AND FRACTURE MECHANISM OF RANDOM COARSE PARTICLES OF DEEP-SEA MINERAL

  • 摘要: 为揭示深海采矿水力输运过程中粗颗粒的冲击破碎机理及规律,实现输运参数优化,本文通过Python程序对颗粒进行随机几何数值重构,开展了颗粒冲击破碎全过程仿真。利用校准后的数值模型研究了撞击速度、角度、粒径对颗粒破碎的影响,确定了典型的颗粒破碎形貌和质量损失率。研究表明:基于I型断裂能的脆性开裂模型可以较准确地模拟颗粒冲击破碎过程,且撞击速度占主要影响,入射角度越大颗粒越容易破碎,细颗粒不易发生破碎,大粒径在低速下也可能产生明显破碎。

     

    Abstract: In order to reveal the collision-induced fragmentation mechanism and law of coarse particles during hydraulic transport of deep sea mining, thus optimizing the transport parameters. In this work, the random geometric numerical reconstruction of coarse particles was carried out based on a Python program, and then the whole process simulation of the collision-induced fragmentation of particle was carried out. The effects of particle impact velocity, impact angle, and particle size on particle fragmentation were studied by the validated numerical model, and the typical particle fracture morphology and mass loss rate were determined. The simulation results show that, the brittle cracking model based on Type I fracture energy can simulate the collision-induced fragmentation process of particle accurately; and the particle fragmentation was mainly influences by impact velocity, and particles are more likely to fragment at higher incidence angles, fine grain are less likely to fragment, while larger sizes may fragment even at low impact velocity.

     

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