Oil-water biphase chaotic mixing enhanced by punched rigid-flexible combination impeller in mixer-settler

LIU Zuohua; XU Chuanlin; HE Muchuan; GU Deyin; XU Huiqin; HE Haixian; TAO Changyuan; WANG Yundong

doi:10.11949/j.issn.0438-1157.20160750

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Oil-water biphase chaotic mixing enhanced by punched rigid-flexible combination impeller in mixer-settler

更新时间：2025-12-10

- Oil-water biphase chaotic mixing enhanced by punched rigid-flexible combination impeller in mixer-settler
- CIESC Journal Issue 2, Pages: 637-642(2017)
- 作者机构：
  
  1. 重庆大学化学化工学院,重庆,400044
  2. 化学工程联合国家重点实验室, 清华大学化学工程系,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160750
  CLC： Q027.2
- Online First：05 February 2017，
  
  Published：05 February 2017
- 稿件说明：
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LIU Zuohua, XU Chuanlin, HE Muchuan, et al. Oil-water biphase chaotic mixing enhanced by punched rigid-flexible combination impeller in mixer-settler[J]. CIESC Journal, 2017, (2): 637-642.
DOI：

LIU Zuohua, XU Chuanlin, HE Muchuan, et al. Oil-water biphase chaotic mixing enhanced by punched rigid-flexible combination impeller in mixer-settler[J]. CIESC Journal, 2017, (2): 637-642. DOI： 10.11949/j.issn.0438-1157.20160750.

摘要

运用LabView和Matlab软件分别采集和处理穿流式刚-柔组合搅拌桨扰动澄清槽中油-水两相流体内部的压力脉动信号，得出的最大Lyapunov指数（LLE）和多尺度熵（MSE），反映流体内部的混沌程度；同时采用流场可视化技术观测流体混合状态。结果表明，相比于刚性组合桨，穿流式刚-柔组合搅拌桨通过穿流孔与柔性部分的共同作用改变流场的结构和能量耗散方式，使流体的混沌程度和混合状态都优于刚性组合桨。当转速为88 r·min-1时，流体的混沌混合都达到最佳状态，各实验条件下的LLE均大于零，表明流场混合体系已进入混沌状态，且穿流式刚-柔组合搅拌桨体系的MSE明显高于刚性组合桨体系，说明穿流式刚-柔组合搅拌桨的混合效果优于刚性组合桨。另外，柔性片上穿流孔的数目和柔性桨叶的厚度对流场的混沌特性也有明显的影响。

Abstract

Signal of punched rigid-flexible combination impeller disturbance of oil-water biphase pressure fluctuation in the mixer-settler were collected and processed by LabView

plus Matlab software. The largest Lyapunov exponent (LLE) and multiscale entropy (MSE) reflected the degree of the chaos in the fluid field. At the same time

the fluid field's visualization technology was adopted to observe fluid mixing performance. It indicated that compared with the rigid combination impeller

with utilizing punched rigid-flexible combination impeller

the fluid field's structure

coupled with the way of energy dissipation was controlled by the synergetic effect of punch hole and flexible impeller. Furthermore

the chaos of fluid and mixing performance were superior to the rigid combination impeller. At rotation speed 88 r·min-1

the chaotic mixing of fluids was at the optimal state

and the LLE was over zero

testifying the fluid mixing system in chaotic state. Punched rigid-flexible combination impeller system of MSE was significantly higher than that of the rigid combination impeller

indicating mixing performance of punched rigid-flexible combination impeller superior to the rigid combination impeller system. The number of punched holes on the flexible and the thickness of flexible blade had obvious influence on the chaotic mixing performance.

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