A Contraction-expansion Helical Mixer in the Laminar Regime

doi:10.1016/S1004-9541(14)60035-5

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (3): 261-266.DOI: 10.1016/S1004-9541(14)60035-5

A Contraction-expansion Helical Mixer in the Laminar Regime

梁栋, 张淑芬

State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China

收稿日期:2012-05-22 修回日期:2013-04-10 出版日期:2014-03-28 发布日期:2014-03-05
通讯作者: ZHANG Shufen
基金资助:
Supported by the National Key Technology R&D Program (2011BAE07B01) and the National Natural Science Foundation of China (20836001).

A Contraction-expansion Helical Mixer in the Laminar Regime

LIANG Dong, ZHANG Shufen

State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China

Received:2012-05-22 Revised:2013-04-10 Online:2014-03-28 Published:2014-03-05
Contact: ZHANG Shufen
Supported by:
Supported by the National Key Technology R&D Program (2011BAE07B01) and the National Natural Science Foundation of China (20836001).

摘要/Abstract

摘要： A contraction-expansion helical mixer which combines several features, viz. helical pipes for induction of secondary flows and sudden expansion and contraction array for expansion vortices, has been designed to enhance flow mixing. A fast competitive-consecutive diazo coupling reaction is used to test the mixing efficiency of contraction-expansion helical mixer. Furthermore, an image processing technique is applied for data visualization and monitoring the extent of mixing. The mixing performance is found to be superior in comparison to the regular helical mixer in the range of Reynolds number from 170 to 1540. Moreover, the mixing time of contraction-expansion helical mixer was found to be reduced by more than 25% compared to the regular helical pipe. Finally, a simple correlation is proposed for predicting the mixing time.

关键词: contraction-expansion, helical pipe, mixing, laminar flow

Abstract: A contraction-expansion helical mixer which combines several features, viz. helical pipes for induction of secondary flows and sudden expansion and contraction array for expansion vortices, has been designed to enhance flow mixing. A fast competitive-consecutive diazo coupling reaction is used to test the mixing efficiency of contraction-expansion helical mixer. Furthermore, an image processing technique is applied for data visualization and monitoring the extent of mixing. The mixing performance is found to be superior in comparison to the regular helical mixer in the range of Reynolds number from 170 to 1540. Moreover, the mixing time of contraction-expansion helical mixer was found to be reduced by more than 25% compared to the regular helical pipe. Finally, a simple correlation is proposed for predicting the mixing time.

Key words: contraction-expansion, helical pipe, mixing, laminar flow

梁栋, 张淑芬. A Contraction-expansion Helical Mixer in the Laminar Regime[J]. Chinese Journal of Chemical Engineering, 2014, 22(3): 261-266.

LIANG Dong, ZHANG Shufen. A Contraction-expansion Helical Mixer in the Laminar Regime[J]. Chin.J.Chem.Eng., 2014, 22(3): 261-266.

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A Contraction-expansion Helical Mixer in the Laminar Regime

A Contraction-expansion Helical Mixer in the Laminar Regime

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