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论文类型：期刊论文

发表时间：2014-03-01

发表刊物：CHINESE JOURNAL OF CHEMICAL ENGINEERING

收录刊物：SCIE、EI、ISTIC

卷号：22

期号：3

页面范围：261-266

ISSN号：1004-9541

关键字：contraction-expansion; helical pipe; mixing; laminar flow

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.