23 January 2006 Passive micromixer with break-up obstructions
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In this paper, we report on design and fabrication of a passive microfluidic mixer capable of mixing at low Reynolds numbers (Re). Passive mixers typically use channel geometry to mix fluids, and many previously reported designs that work only at moderate to high Reynolds numbers and are often difficult to fabricate. Our design uses diamond-shaped obstructions inside the microchannel to break up and laminate the flow, thus enhancing mixing. Both numerical and experimental studies show that the mixer is efficient at mixing fluids at low Reynolds numbers. We benchmarked our mixer design against a conventional T-mixer. Results show that the new design exhibits rapid mixing at Re < 0.1. The new mixer has a planar design which is easy to fabricate and thus will benefit a wide range of lab-on-a-chip applications.
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Ali Asgar S. Bhagat, Ali Asgar S. Bhagat, Erik T. K. Peterson, Erik T. K. Peterson, Ian Papautsky, Ian Papautsky, "Passive micromixer with break-up obstructions", Proc. SPIE 6112, Microfluidics, BioMEMS, and Medical Microsystems IV, 61120J (23 January 2006); doi: 10.1117/12.648150; https://doi.org/10.1117/12.648150

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