SK型静态混合器的液液分散数值模拟

Numerical simulation of liquid-liquid dispersion in SK static mixer

为了对静态混合器中的液液分散过程进行深入研究,选用Euler多相流模型和k-ε湍流模型,采用计算流体力学(CFD)的方法,分别计算了单旋和四旋结构的SK型静态混合器的流场。数值模拟结果表明,液液分散过程中四旋结构产生的压降大约是单旋结构的3倍。X<0.04m时,四旋结构湍流强度大,混合效果优于单旋结构;X>0.04m时,单旋结构的旋转强化了对漩涡的作用,混合效果更好。研究发现,在X<0.04m时采用四旋单元,而后采用单旋单元可以取得优秀的混合效果。

In order to study the liquid-liquid dispersion of the static mixer,with Euler multiphase model and standard k-εturbulent model,CFD method is used to simulate the flow field of the SK static mixer with single-turn and four-turn structure.The numerical simulation result shows that the pressure drop of four-turn structure is about triple of the pressure drop of single-turn structure in liquid-liquid dispersion.For X〈0.04 m,turbulent intensity of four-turn structure is bigger than that of single-turn structure,and its mixing effect is better.For X〉0.04 m,rotation effect of single-turn structure strengthens vortex,and its mixing condition is better than that of four-turn structure.Thus,four-turn structure is suggested to be applied at X〉0.04 m,whereas single-turn structure at X0.04 m.