کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
160244 457070 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An overlapping crisscross micromixer
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
An overlapping crisscross micromixer
چکیده انگلیسی

We propose a grooved micromixer incorporating an overlapping crisscross inlet port that is located at the intersection of two patterned channels crossing one above another. Both numerical analysis and experimental verification of the flow structure of this design have substantiated the superior mixing features over the existing herringbone mixer. Because of the symmetric feature of this microstructure, fabrication becomes simplified through assembling two identical PDMS-based slabs oppositely. Both experimental results for flow visualization and numerical simulation reveal significant cross flow at the intersection of the two channels and vertical tumbling of the flow. This activated flow feature supplies downstream fluids with vertical momentum to enhance the chaotic advection and enlarges the interfacial area between the two mixing fluids. All these features improve the mixing performance of this novel overlapping crisscross micromixer by 46% compared with the mixing indices of the staggered herringbone mixer for the longitudinal distance L=2047μm. Furthermore, on modulating the ratio of volumetric flow rates between the two inlet streams, an excellent mixing function with a specific prearranged concentration of a mixture and a decreased pressure loss are achieved. The divided ratios Qt/QlQt/Ql, defined as diverted flow rate over forward flow rate, are between 1.86 and 2.88 for fluid A and between 0.52 and 0.67 for fluid B with a variable initial flow rate ratio.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 62, Issue 3, February 2007, Pages 711–720
نویسندگان
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