Chaotic mixing and dispersing characteristics of gas-liquid two phases in stirred tank

GU Deyin; LIU Zuohua; ZHANG Jiyizhe; QIU Facheng; LI Jun; TAO Changyuan; WANG Yundong

doi:10.11949/j.issn.0438-1157.20171208

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Chaotic mixing and dispersing characteristics of gas-liquid two phases in stirred tank

更新时间：2025-12-10

- Chaotic mixing and dispersing characteristics of gas-liquid two phases in stirred tank
- CIESC Journal Issue 2, Pages: 625-632(2018)
- 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,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171208
  CLC： Q027.2
- Online First：05 February 2018，
  
  Published：05 February 2018
- 稿件说明：
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GU Deyin, LIU Zuohua, ZHANG Jiyizhe, et al. Chaotic mixing and dispersing characteristics of gas-liquid two phases in stirred tank[J]. CIESC Journal, 2018, (2): 625-632.
DOI：

GU Deyin, LIU Zuohua, ZHANG Jiyizhe, et al. Chaotic mixing and dispersing characteristics of gas-liquid two phases in stirred tank[J]. CIESC Journal, 2018, (2): 625-632. DOI： 10.11949/j.issn.0438-1157.20171208.

摘要

传统Rushton刚性桨常应用于过程工业中搅拌反应器内的气液分散过程，但由于桨叶背后易形成较大的气穴，气液混合效果较差。为了提高搅拌槽内气液两相的混合效果，提出了一种刚柔组合桨强化气液两相的分散过程。利用LabVIEW软件处理刚性桨和刚柔组合桨体系中气液混合过程的压力脉动信号，通过Matlab软件编程计算最大Lyapunov指数（LLE），分析气液混合体系的混沌混合行为，同时，对刚性桨和刚柔组合桨体系中的相对搅拌功耗、整体气含率、局部气含率进行测量。结果表明，在功耗为170 W，通气量为10 m3·h-1条件下，与刚性桨相比，刚柔组合桨能够通过刚-柔-流的耦合作用促进桨叶能量的传递过程，提高搅拌体系的混沌混合程度，刚柔组合桨体系的LLE提高了8.89%。同时，在相同操作条件下，与刚性桨相比，刚柔组合桨能够有效提高相对搅拌功耗以及搅拌槽内的整体气含率和局部气含率，且搅拌槽内气体分散更为均匀。

Abstract

Traditional Rushton rigid impeller is often applied to gas-liquid dispersion process in industrial stirred tank reactors. However

poor gas dispersion capacity is occurred behind impeller blades due to easy formation of gas cavitation. In order to improve gas-liquid mixing performance

a rigid-flexible impeller was proposed to intensify gas dispersion process. Time series data of pressure fluctuation were recorded by LabVIEW and the largest Lyapunov exponent (LLE) was calculated by Matlab to analyze chaotic characteristics of gas-liquid mixing behavior

while relative power demand

total gas holdup

and local gas holdup were measured simultaneously in stirred tank with a rigid impeller or a rigid-flexible impeller. Results showed that

under condition of power consumption at 170 W and gas flowrate at 10 m3·h-1

rigid-flexible impeller could strengthen energy transfer and enhance chaotic mixing through rigid-flexible-flow interaction. LLE value of rigid-flexible impeller system was 8.89% higher than that of rigid impeller system. Rigid-flexible impeller could improve relative power demand

total gas holdup

local gas holdup

and more homogeneously gas dispersion

compared to rigid impeller at the same operating conditions.

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