穿流-柔性组合桨强化搅拌槽中流体混沌混合特性

doi:10.11949/j.issn.0438-1157.20151054

化工学报 ›› 2015, Vol. 66 ›› Issue (12): 4736-4742.DOI: 10.11949/j.issn.0438-1157.20151054

穿流-柔性组合桨强化搅拌槽中流体混沌混合特性

刘仁龙¹, 李爽¹, 刘作华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

收稿日期:2015-07-03 修回日期:2015-09-09 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: 刘仁龙
基金资助:
国家重点基础研究发展计划项目(2012CBA01203);国家自然科学基金项目(51274261, 21576033);清华大学化学工程联合国家重点实验室开放课题(SKL-ChE-15A02)。

Chaotic mixing enhanced by punched-flexible impeller in stirred vessel

LIU Renlong¹, LI Shuang¹, LIU Zuohua¹, 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:2015-07-03 Revised:2015-09-09 Online:2015-12-05 Published:2015-12-05
Supported by:
supported by the National Basic Research Program of China(2012CBA01203), the National Natural Science Foundation of China(51274261, 21576033) and the State Key Laboratory of Chemical Engineering (SKL-ChE-15A02).

摘要/Abstract

摘要：

刚性搅拌桨在搅拌混合过程中得到广泛的应用,在搅拌容器内容易形成两种不同的混合区域:混沌混合区和混合隔离区。强化流体混合的有效途径是合理设计搅拌桨,从而调控流体混沌混合行为。实验运用Labview和Matlab软件采集和处理流体内部压力脉动信号,并获取流体混沌特性参数Kolmogorov熵,对穿流-柔性组合桨体系的Kolmogorov熵随转速的变化规律进行了研究。结果表明,相比传统刚性桨,穿流桨对Kolmogorov熵影响不大。穿流-柔性组合桨通过穿流孔与柔性部分的共同作用调控流场结构,使流体混沌混合的效果最好,在转速为180 r·min^-1时流体的混沌混合达到最佳状态,穿流-柔性组合桨体系的Kolmogorov熵为0.285,而传统刚性桨体系的Kolmogorov熵只为0.125;穿流-柔性组合桨体系的混合时间明显低于传统刚性桨体系,当转速为120 r·min^-1时穿流-柔性组合桨体系的混合时间比传统刚性桨体系缩短了17%。

关键词: 搅拌容器, 混沌, 混合, 穿流-柔性组合桨, Kolmogorov熵, 混合时间

Abstract:

Rigid impeller is widely used in stirring mixer. Two mixing regions are usually generated easily: chaotic mixing region and isolated mixing region. Reasonable design of impeller is an effective way to enhance fluid mixing, so that the behavior of chaotic mixing can be regulated. In this study, the signal of pressure fluctuation in the fluid and the chaotic characteristic parameter of Kolmogorov entropy are managed by Labview and Matlab software, and the variation of Kolmogorov entropy with revolving speed in punched impeller system is investigated. The results indicate that the punched impeller system has a negligible influence on Kolmogorov entropy comparing to the traditional rigid impeller system. With punched-flexible impeller, the flow field structure can be regulated efficiently by the co-effect between punch hole and flexible impeller, resulting in excellent chaotic mixing in fluid field with the best effect at 180 r·min^-1. Simultaneously, the Kolmogorov entropy of punched-flexible impeller system achieves 0.285, while the value is 0.125 for the traditional rigid impeller system. Obviously, the mixing time in punched-flexible impeller system is superior to that in traditional rigid impeller system, which is decreased by about 17% at revolving speed of 120 r·min^-1.

Key words: stirred vessel, chaos, mixing, punched-flexible impeller, Kolmogorov entropy, mixing time

中图分类号:

TQ027.2

刘仁龙, 李爽, 刘作华, 陶长元, 王运东. 穿流-柔性组合桨强化搅拌槽中流体混沌混合特性[J]. 化工学报, 2015, 66(12): 4736-4742.

LIU Renlong, LI Shuang, LIU Zuohua, TAO Changyuan, WANG Yundong. Chaotic mixing enhanced by punched-flexible impeller in stirred vessel[J]. CIESC Journal, 2015, 66(12): 4736-4742.

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穿流-柔性组合桨强化搅拌槽中流体混沌混合特性

Chaotic mixing enhanced by punched-flexible impeller in stirred vessel

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