Chaotic mixing behavior of non-Newtonian fluid intensified by multilayer rigid-flexible impeller induced flow field interface instability

LIU Zuohua; YANG Linrong; XIONG Xia; TAO Changyuan; WANG Yundong; CHENG Fangqin

doi:10.11949/0438-1157.20200315

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Chaotic mixing behavior of non-Newtonian fluid intensified by multilayer rigid-flexible impeller induced flow field interface instability

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Chaotic mixing behavior of non-Newtonian fluid intensified by multilayer rigid-flexible impeller induced flow field interface instability
- CIESC Journal Vol. 71, Issue 12, Pages: 5470-5478(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：10.11949/0438-1157.20200315
  CLC： TQ 027.2
- Received：25 March 2020，
  
  Revised：2020-05-18，
  
  Online First：17 December 2020，
  
  Published：05 December 2020
- 稿件说明：
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刘作华, 杨林荣, 熊黠, 陶长元, 王运东, 程芳琴. 多层刚柔组合桨诱发流场界面失稳强化非牛顿流体混沌混合行为[J]. 化工学报, 2020, 71(12): 5470-5478

LIU Zuohua, YANG Linrong, XIONG Xia, TAO Changyuan, WANG Yundong, CHENG Fangqin. Chaotic mixing behavior of non-Newtonian fluid intensified by multilayer rigid-flexible impeller induced flow field interface instability[J]. CIESC Journal, 2020, 71(12): 5470-5478
刘作华, 杨林荣, 熊黠, 陶长元, 王运东, 程芳琴. 多层刚柔组合桨诱发流场界面失稳强化非牛顿流体混沌混合行为[J]. 化工学报, 2020, 71(12): 5470-5478 DOI： 10.11949/0438-1157.20200315.

LIU Zuohua, YANG Linrong, XIONG Xia, TAO Changyuan, WANG Yundong, CHENG Fangqin. Chaotic mixing behavior of non-Newtonian fluid intensified by multilayer rigid-flexible impeller induced flow field interface instability[J]. CIESC Journal, 2020, 71(12): 5470-5478 DOI： 10.11949/0438-1157.20200315.

摘要

传统多层刚性桨用于假塑性非牛顿流体混合搅拌死区较大，流场界面稳定，混合效率低。提出多层刚柔组合桨诱发流场界面失稳强化非牛顿流体混沌混合的方法。实验以羧甲基纤维素钠为非牛顿流体体系，通过扭矩传感器测量功率特性，酸碱中和脱色法测定混合时间，并利用Matlab 软件编程计算最大Lyapunov 指数，分析了非牛顿流体混合过程中的混沌特性及其混合性能。结果表明，组合方式为RF-（PBTD+PBTD+DT）、桨叶排列方式

=60°、柔性片长度安装比例

=0.8、1.2时，混沌程度较高，混合性能较好。多层刚柔组合桨可以产生多股螺旋流，并在层间柔性片扰动频率差下实现流场界面失稳，搅拌死区减小，在较低转速下使体系进入混沌状态（多层刚柔组合桨体系

88 r/min时LLE

0，多层刚性桨体系

125 r/min时LLE

0）；在相同转速下，多层刚柔组合桨混合速率、单位体积功率高于多层刚性桨，而单位体积混合能大致相同。

Abstract

The traditional multilayer rigid impeller has large dead zone for the mixing of pseudoplastic non-Newtonian fluid

stable flow field interface and low mixing efficiency. A method for enhancing the chaotic mixing of non-Newtonian fluid by multilayer rigid-flexible impeller induced flow field interface instability was proposed. In the experiment

sodium carboxymethylcellulose was used as the non-Newtonian fluid system. The power characteristics were measured by the torque sensor. The mixing time was determined by the acid-base neutralization and decolorization method. The

largest Lyapunov exponents were calculated by using Matlab software programming. The chaotic characteristics and mixing performance in the mixing process are analyzed. The results show that when the combination mode was RF-(PBTD+PBTD+DT)

the impeller arrangement mode

=60°

and the flexible sheet length installation ratio

=0.8

1.2

the degree of chaos was higher and the mixing performance was better. Multilayer rigid-flexible impeller can generate multiple spiral flows

and realize the flow field interface instability under the disturbance frequency difference of the flexible sheet between the layers

the stirring dead zone was reduced

and the system enters a chaotic state at a lower speed (when the multilayer rigid-flexible impeller system

88 r/min

LLE

0; when the multilayer rigid impeller system

125 r/min

LLE

0). At the same speed

the mixing rate and power per unit volume of the multilayer rigid-flexible combined impeller are higher than that of the multilayer rigid impeller

but the mixing energy per unit volume is approximately the same.

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references

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