穿孔对穿孔型Kenics静态混合器混合性能的影响OA北大核心CSTPCD

In order to improve the mixing effect of the traditional Kenics static mixer,a perforated Kenics static mixer was designed by introducing a perforated structure into the traditional helical insert belt structure.The coefficient of concentration variation(COV)was used to evaluate the effects of inner diameter of perforation(d),spacing of perforation(S),and length-to-diameter ratio of mixed elements(Ar)on the mixing performance of the perforated static mixer.The simulation results show that the set perforated structure can significantly change the flow state of the fluid and produce accelerated flow in the perforation area,thus improving the mixing performance of the mixer.With the increase in d,the convection and exchange between the fluids are gradually enhanced,and the mixing effect is gradually strengthened.However,with the continuous increase in d,the spiral channel inside the mixer is destroyed,and the mixing effect is weakened.Only changing S has no obvious effect on the mixing effect.For the mixer of the same length,the decrease in Ar leads to more mixed components,enhanced torsion and shear effect between liquids,and better mixing effect of the mixer.