摘要
通过对圆形搅拌容器内部流场的数值模拟,从湍流速度场、湍动耗散率和湍动能3个角度来分析该容器内的二维空间流态变化,及其对混凝过程中颗粒碰撞和絮体成长的影响,针对其不足之处,提出改进模型:方形、圆形挡板、多边形、圆角和方形导流板模型,并分别比较各模型在不同转速下的内部流场的变化。结果表明,在相同截面积的条件下,圆角模型更有利于颗粒的碰撞粘结和絮体的成长。
Through the numerical simulation of internal flow field for the round mixing container, the turbu- lence velocity field, turbulent dissipation rate and turbulence kinetic energy were analyzed for the flow changes of two-dimensional space in the container, the influence of particle coagulation collisions and the floe growth in the mixing process. For the round mixing container＇ s shortcomings, the experiment put forward a series of improved models： circular baffle, square glass, polygon glass, round angle glass and square spoiler model, then compared their internal flow field changes under different rotating speed. The results show that under the same cross-sec- tional area, the round angle model is more conducive to collision of particles bond and the growth of floe.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第7期2215-2220,共6页
Chinese Journal of Environmental Engineering
基金
国家"863"高技术研究发展计划项目(2006BAC19B02)
关键词
絮凝动力学
数值模拟
圆形模型
改进模型
flocculation kinetics
numerical simulation
round model
improved models
