摘要
利用计算流体力学软件Fluent对3层错位45°齿型叶轮强力搅拌机固液混合过程进行了数值模拟研究。采用Euler多相流模型以及k-ε湍流模型对固液混合过程进行数值模拟,分析强力搅拌机调浆工艺过程中的固液混合流场特性以及固体颗粒的分布规律,并对其搅拌性能进行研究与讨论。结果表明:在强力搅拌机调浆过程中,颗粒在流场内部形成较为稳定的循环,各部分颗粒体积分数达到平衡,并形成3层稳定的循环流。当转速分别为20,40 rad/s时,搅拌机内颗粒体积分数达到不平衡,但是存在一定的浓度差。当转速分别为60,80,100 rad/s时,搅拌时间分别为8 s、6 s、3 s,流场内颗粒体积分数相等,消除了浓度差。通过对搅拌扭矩值进行模拟计算以及公式计算,研究不同转速下矿物颗粒粒径对搅拌功率的影响,计算结果表明,搅拌功率随矿物颗粒粒径以及转速的增加而增加,并且转速对搅拌功率的影响更明显。
The solid-liquid mixing process of strong mixer with three staggered layers of 45°tooth impellers was numerically simulated by computational fluid dynamics software Fluent.Euler multiphase flow model and k-εturbulence model were used to simulate the solid-liquid mixing process.The flow field characteristics of solid-liquid mixing and the distribution law of solid particles were analyzed in the slurry mixing process of strong mixer,and its mixing performance was discussed.The results show that during the mixing process of the strong mixer,the particles form a relatively stable circulation in the flow field,the volume fraction of each part of the particles reaches equilibrium,and a three-layer stable circulation flow is formed.When the rotating speed is 20 rad/s and 40 rad/s respectively,the particle volume fraction in the mixer can not reach equilibrium,but there is a certain concentration difference.When the rotating speed is 60 rad/s,80 rad/s,and 100 rad/s respectively,the mixing time is 8 s,6 s and 3 s respectively,the particle volume fraction in the flow field is equal,and the concentration difference is eliminated.Through the simulation calculation and formula calculation of the stirring torque value,the influence of mineral particle size on the mixing power at different rotating speeds was studied.The calculation results show that the mixing power increases with the increase of mineral particle size and rotating speed.And the influence of rotating speed on mixing power is more obvious.
作者
苟炳中
孙春宝
寇珏
GOU Bingzhong;SUN Chunbao;KOU Jue(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第3期134-139,共6页
Mining Research and Development
关键词
固液混合
强力搅拌
流场特性
计算流体力学
Solid-liquid mixing
Strong stirring
Flow field characteristics
CFD
