Journal
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
Volume 24, Issue 5, Pages 1391-1399Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JMEMS.2015.2403472
Keywords
Microfluidics; passive micromixer; isocratic mixing; gradient mixing; laminar flow
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Funding
- Chinese National Instrumentation Project [2013YQ1904670403]
- Fundamental Research Funds for the Central Universities [3102014JC02010505]
- 111 Project [B13044]
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This paper reports the development of a 3-D passive micromixer named the overbridge-shaped micromixer (OBM), which can achieve fast mixing by taking advantage of the splitting, recombination, and chaotic advection mechanisms simultaneously. A scheme with the splitting channels of unequal widths is proposed for tremendously enhancing the mixing uniformity in the regions closing to the side walls. The channel depth-to-width ratio is the key factor to mixing performance. A four-unit OBM has been successfully fabricated via a multilayer polydimethylsiloxane process, and the total length of the OBM is <2 mm. Up to a 90% efficiency has been achieved within a Reynolds number (Re) range from 0.01 to 200 by numerical analysis, and the same mixing efficiency was also proven experimentally within a Re range from 0.01 to 50. A high efficiency of 90% was also obtained when mixing two fluids with different flow rates at the two inlets ranging from a ratio of 1:9 to 9:1. [2014-0186]
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