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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Mixing performance of a chaotic micro-mixer
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Mixing performance of a chaotic micro-mixer

机译：一个混乱的micro-mixer的混合性能

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摘要

Micro-mixing of liquids is a difficult problem since the mixing performance is governed by the slow diffusive mass transfer.In the present work a novel chaotic micro-mixer,which combines several features,uiz.curved channels for induction of secondary flows,split-and-recombine structures and flow separation due to forward-and backward-facing steps,is investigated.Image processing technique is used to monitor the extent of mixing.In the study by Jiang et al.[Jiang,E,Drese,K.S.,Hardt,S.,Kuepper,M.and Schonfeld,E,2004,Helical flows and chaotic mixing in curved micro channels.AIChE J,50:2297-2305],it is shown that simple planar meandering channels induce chaotic convection by means of alternating Dean flows for sufficiently high flow rates.The mixing performance,however,is drastically decreased for lower Dean numbers(i.e.,K<150).The novel mixer design overcomes this drawback by combining different mixing methods.Especially at relatively low Dean numbers the mixing performance is found to be superior in comparison to the planar meandering mixer.Moreover,the dependence of the mixing performance on the viscosity and viscosity differences is investigated.Finally,a simple correlation for the prediction of the mixing time is proposed.
机译：Micro-mixing液体是一个困难的问题因为混合性能是由缓慢的扩散传质。一种新型混沌micro-mixer相结合一些特性,uiz。感应的二次流,split-and-recombine结构和流动分离由于露面面向后方的步骤,是调查。处理技术用于监控混合的程度。艾尔。k .江,E, Drese,哈特,年代,Kuepper, m联系,E, 2004年,螺旋流和混乱的混合在弯曲微通道。结果表明,简单的平面蜿蜒的通道诱发混沌对流通过交替院长流足够高流率。然而,混合性能显著减少降低院长数字(例如,K < 150)小说混合器的设计克服了这一缺点结合不同的混合方法。相对较低的院长数字混合性能优越的相比平面蜿蜒的混合器。依赖的混合性能粘度和粘度差异调查。提出了预测的混合时间。

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