Chaotic mixing performance of high-viscosity fluid synergistically intensified by flexible impeller and floating particles

doi:10.3969/j.issn.0438-1157.2013.08.013

CIESC Journal ›› 2013, Vol. 64 ›› Issue (8): 2794-2800.DOI: 10.3969/j.issn.0438-1157.2013.08.013

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Chaotic mixing performance of high-viscosity fluid synergistically intensified by flexible impeller and floating particles

LIU Zuohua¹, YANG Xianyan¹, XIE Zhaoming¹, LIU Renlong¹, TAO Changyuan¹, WANG Yundong²

1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2012-12-16 Revised:2013-04-02 Online:2013-08-05 Published:2013-08-05
Supported by:
supported by the National Basic Research Program of China(2012CDA01203),the New Century Excellent Talents in University(NCET-0552)and the Key Laboratory of Chemical Engineering(SKL-ChE-12A02).

柔性桨与自浮颗粒协同强化高黏度流体混沌混合

刘作华¹, 杨鲜艳¹, 谢昭明¹, 刘仁龙¹, 陶长元¹, 王运东²

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

通讯作者: 刘作华(1973- ),男,博士,副教授。
作者简介:刘作华(1973- ),男,博士,副教授。
基金资助:
国家重点基础研究发展计划项目(2012CDA01203);教育部新世纪优秀人才支持计划项目(NCET-0552);清华大学化学工程联合国家重点实验室开放课题(SKL-ChE-12A02)。

Abstract

Abstract: There are both a chaotic mixing region and an isolated mixing region for the high-viscosity laminar flow mixing system.Increasing chaotic mixing is the effective method to enhance mixing performance.To obtain good mixing performance in the high viscosity fluid mixing system,flexible impeller together with floating particles were used in the glycerol mixing system.The largest Lyapunov exponent(LE_max)was obtained to study the relationship between chaotic mixing degree and power consumption(P_v).It indicated that only adding the floating particles had no effect on LE_max,but the flexible impeller could contribute to enlarging LE_max.When P_v was 2000 W·m^-3,the LE_max of the primary system could be enlarged by 10.29% while using flexible impeller,and when floating particles and flexible impeller worked together,LE_max could be enlarged by 30.86%.At a low P_v(P_v≤2000 W·m^-3),the chaotic mixing of high-viscosity fluid using floating particles synergistically with flexible impeller was much better than the system using the traditional turbine impeller.

Key words: flexible impeller, floating particle, high-viscosity fluid, largest Lyapunov exponent, chaotic mixing

摘要： 高黏度流体混合处于层流状态,存在混沌混合区和隔离区,混沌混合是提高其混合效率的有效方法。为增强高黏度流体的混沌混合,在甘油体系中采用柔性搅拌桨并加入自浮颗粒,实验研究了最大Lyapunov指数(LE_max)随单位体积功耗(P_v)的变化规律。结果表明,只加入固体颗粒对原体系LE_max的影响不大,当P_v=2000 W·m^-3时,使用柔性桨后体系LE_max增加10.29%;柔性桨与固体颗粒协同作用时,可使体系LE_max增加30.86%。在P_v≤2000 W·m^-3时,柔性桨和自浮颗粒协同强化高黏度流体混沌混合的效果最好。

关键词: 柔性搅拌桨, 自浮颗粒, 高黏度流体, 最大Lyapunov指数, 混沌混合

CLC Number:

TQ027.2

LIU Zuohua, YANG Xianyan, XIE Zhaoming, LIU Renlong, TAO Changyuan, WANG Yundong. Chaotic mixing performance of high-viscosity fluid synergistically intensified by flexible impeller and floating particles[J]. CIESC Journal, 2013, 64(8): 2794-2800.

刘作华, 杨鲜艳, 谢昭明, 刘仁龙, 陶长元, 王运东. 柔性桨与自浮颗粒协同强化高黏度流体混沌混合[J]. 化工学报, 2013, 64(8): 2794-2800.

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Chaotic mixing performance of high-viscosity fluid synergistically intensified by flexible impeller and floating particles

柔性桨与自浮颗粒协同强化高黏度流体混沌混合

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