Micromixing simulation of novel large-double-blade impeller

作者：Liu, Baoqing; Zhang, Yikun; Zheng, Yijun; Huang, Bolin; Chen, Xiaoge; Jin, Zhijiang^*

来源：Journal of the Taiwan Institute of Chemical Engineers, 2016, 66: 62-69.

DOI：10.1016/j.jtice.2016.06.029

• Novel large-double-blade impeller
• Micromixing
• Segregation index
• Numerical simulation

The novel large-double-blade impeller spans a wide range of industrial application areas owing to its obvious advantages in the rapid reactions. So it is indeed necessary to have a profound understanding of microrriixing characteristics about the novel large-double-blade impeller. This paper establishes a model to analyze the three main factors' effect on the segregation index through the numerical simulation which is used to research the performance of novel large-double-blade impeller. The three main factors are separately feed discretization number, feeding location and agitation speed. Through the analysis above, the turbulent energy dissipation rate and concentration distribution of H+, I-3(-) would be deduced. Meanwhile, it compared with the Fullzone (FZ) impeller and double ribbon (DHR) impeller. The results show that (1) when the feed discretization number is over 35, the segregation index would tend to be the fixed specific value. And only in that situation, the effect of macro mixture could be ignored. (2) The optimized feeding location is in the blade area with a vast, turbulent energy dissipation rate to achieve a better micromixing performance, which is demonstrate by the consumption curve of H+ and the generation contour of I3(-). (3) The main spot of the consumption of H+ and the generation of I-3- is on the one side of the feeding location. Besides, compared with FZ impeller and DHR impeller in the same scale and operating condition, novel large-double-blade impeller has a better micromixing performance.

• 出版日期2016-9
• 单位浙江大学