کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
622315 882626 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mixing performance of a chaotic micro-mixer
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Mixing performance of a chaotic micro-mixer
چکیده انگلیسی

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, viz. 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, F., Drese, K.S., Hardt, S., Kuepper, M. and Schönfeld, F., 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Research and Design - Volume 86, Issue 10, October 2008, Pages 1128–1134
نویسندگان
, , ,