Micromixing and Enhancement Characteristics in Lightnin Static Mixer
YU Yanfang, HE Yuanyuan, MENG Huibo, YAO Yunjuan, WU Jianhua
School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Liaoning Key laboratory of Chemical Technology for Efficient Mixing, Shenyang 110142, China
Abstract：In this paper, the parallel competition reaction of iodide and iodate is selected was the working system, and the microscopic characteristics in Lightnin Static Mixer (LSM) were numerically studied by using the species transport model. The deviation between numerical prediction and experimental results was 6.16%. In the sufficiently turbulent at Reynolds number (Re) was 3 000-7 000, the swirling intensity of the material entering the swirling element was sinusoidal periodic distribution along with the flow and the peak value of the swirling intensity gradually shifted to the right. The centrifugal forced in the flow passage made the reverse-symmetric vortex center on both sides of the element gradually evolve towards the tube wall. The segregation index of micromixing parameter at the ratio of axial distance (z) to mixing element length (l) with z/l=2 was improved by 95.65%-96.18% for in comparison with the hollow tube section. The micromixing effect was better when the inlet size [i.e. the ratio of hydrogen ion H+ inlet diameter (d) to tube diameter (D)] was 0.7. Compared with the micromixing characteristics at volume flow ratio (VB/VA) was 4, it was improved by 6.7%, 10%, 12%, and 13.3% when VB/VA were 6, 8, 10, and 12. The effects of Re, inlet H+ concentration, and inlet size were analyzed based on the orthogonal principle. It was found that the effect of inlet size was greater than the other two factors on the mixing characteristics.
YU Yanfang,HE Yuanyuan,MENG Huibo et al. Micromixing and Enhancement Characteristics in Lightnin Static Mixer[J]. Chemical Reaction Engineering and Technology, 2022, 38(4): 298-309.
