Experiment and numerical simulation of chaotic mixing performance enhanced by perturbed rigid-flexible impeller in stirred tank

Zuohua LIU; Hongjun WEI; Xia XIONG; Changyuan TAO; Yundong WANG; Fangqin CHENG

doi:10.11949/0438-1157.20200313

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Experiment and numerical simulation of chaotic mixing performance enhanced by perturbed rigid-flexible impeller in stirred tank

Fluid dynamics and transport phenomena | 更新时间：2025-11-25

- Experiment and numerical simulation of chaotic mixing performance enhanced by perturbed rigid-flexible impeller in stirred tank
- CIESC Journal Vol. 71, Issue 10, Pages: 4621-4631(2020)
- 作者机构：
  
  1.重庆大学化学化工学院，重庆 400044
  2.清华大学化学工程系，北京 100084
  3.煤矿灾害动力学与控制国家重点实验室，重庆大学，重庆 400044
  4.山西大学资源与环境工程研究所，山西太原 030006
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20200313
  CLC： TQ 027.2
- Received：24 March 2020，
  
  Revised：2020-04-26，
  
  Published：05 October 2020
- 稿件说明：
移动端阅览
刘作华, 魏红军, 熊黠, 陶长元, 王运东, 程芳琴. 错位刚柔桨强化搅拌槽内流体混合实验及数值模拟[J]. 化工学报, 2020, 71(10): 4621-4631

LIU Zuohua, WEI Hongjun, XIONG Xia, TAO Changyuan, WANG Yundong, CHENG Fangqin. Experiment and numerical simulation of chaotic mixing performance enhanced by perturbed rigid-flexible impeller in stirred tank[J]. CIESC Journal, 2020, 71(10): 4621-4631
刘作华, 魏红军, 熊黠, 陶长元, 王运东, 程芳琴. 错位刚柔桨强化搅拌槽内流体混合实验及数值模拟[J]. 化工学报, 2020, 71(10): 4621-4631 DOI： 10.11949/0438-1157.20200313.

LIU Zuohua, WEI Hongjun, XIONG Xia, TAO Changyuan, WANG Yundong, CHENG Fangqin. Experiment and numerical simulation of chaotic mixing performance enhanced by perturbed rigid-flexible impeller in stirred tank[J]. CIESC Journal, 2020, 71(10): 4621-4631 DOI： 10.11949/0438-1157.20200313.

摘要

为消除搅拌反应器中混合隔离区，对标准刚性桨（R-RT）、错位刚性桨（PR-RT）和错位刚柔桨（PRF-RT）三种桨叶体系的流体混沌特性参数、流场结构以及流体运动速度进行了探讨。采用Matlab软件编程计算最大Lyapunov指数（LLE）和多尺度熵（MSE），通过计算流体力学研究了三种桨叶体系流场结构和流体运动速度的差异。实验及计算结果表明，错位刚柔桨通过柔性桨叶的随机扰动破坏了隔离区介稳态流场边界，较大程度地消除了混合隔离区。PRF-RT的LLE相比于R-RT和PR-RT分别提高了13.29%和7.25%，MSE也较PR-RT和R-RT大；PRF-RT增强了流场不稳定性，形成了不对称性流场结构，减少了隔离区分布范围；PRF-RT强化桨叶能量耗散，提高了搅拌槽底部、顶部液面以及搅拌槽壁区域流体运动速度，减小了流体混合时间。

Abstract

To eliminate the isolated mixing regions in the stirred tank

factors associated with chaotic mixing performance were studied

including flow field structure and fluid velocity of rigid RT impeller (R-RT)

perturbed rigid RT impeller (PR-RT) and perturbed rigid-flexible RT impeller (PRF-RT). The maximum Lyapunov exponent (LLE) and multi-scale entropy (MSE) were calculated by using Matlab software programming

and the differences in flow field structure and fluid velocity of the three blade systems were studied through computational fluid mechanics. The experimental and computational results showed that perturbed rigid-flexible RT impeller could destroy the boundary of the mesostatic flow field in the isolated mixing regions and the symmetry flow in the process of fluid mixing through the random disturbance of the flexible blade

eliminating the isolated mixing regions. At 90 r/min

the LLE of the perturbed rigid-flexible RT impeller is larger than that of rigid RT impeller and perturbed rigid RT impeller. The LLE of the rigid-flexible RT impeller compared with the rigid RT impeller and perturbed rigid RT impeller increases 13.29% and 7.25% respectively and the MSE of the perturbed rigid-flexible RT impeller is also larger than that of rigid RT impeller and perturbed rigid RT impeller. The perturbed rigid-flexible RT impeller enhances the flow field instability

forms an asymmetric flow field structure

and reduces the distribution range of isolated mixing regions. The perturbed rigid-flexible RT impeller enhances the energy dissipation of the blade

improves the fluid velocity at the bottom and top of the tank and the wall of the tank

and reduces the mixing time.

关键词

Keywords

references

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