混凝搅拌内部流场数值模拟分析

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。

Internal flow numerical simulation analysis of coagulation mixing

Through the numerical simulation of internal flow field for the round mixing container,the turbulence 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 floc 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-sectional area,the round angle model is more conducive to collision of particles bond and the growth of floc.