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Open AccessFeature PaperArticle

Novel 3-D T-Shaped Passive Micromixer Design with Helicoidal Flows

1
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
2
Department of Civil Engineering, Bartin University, 74100 Bartin, Turkey
*
Author to whom correspondence should be addressed.
Processes 2019, 7(9), 637; https://doi.org/10.3390/pr7090637
Received: 4 September 2019 / Revised: 10 September 2019 / Accepted: 17 September 2019 / Published: 19 September 2019
(This article belongs to the Special Issue Water Quality Modelling)
Laminar fluid flow and advection-dominant transport produce ineffective mixing conditions in micromixers. In these systems, a desirable fluid mixing over a short distance may be achieved using special geometries in which complex flow paths are generated. In this paper, a novel design, utilizing semi-circular ridges, is proposed to improve mixing in micro channels. Fluid flow and scalar transport are investigated employing Computational Fluid Dynamics (CFD) tool. Mixing dynamics are investigated in detail for alternative designs, injection, and diffusivity conditions. Results indicate that the convex alignment of semi-circular elements yields a specific, helicoidal-shaped fluid flow along the mixing channel which in turn enhances fluid mixing. In all cases examined, homogenous concentration distributions with mixing index values over 80% are obtained. When it is compared to the classical T-shaped micromixer, the novel design increases mixing index and mixing performance values by the factors of 8.7 and 3.3, respectively. It is also shown that different orientations of ridges adversely affect the mixing efficiency by disturbing the formation of helicoidal-shaped flow profile. View Full-Text
Keywords: passive micromixer; microfluidics; CFD; engulfment flow; helicoidal flow; vortex flow; chaotic advection; T-micromixer passive micromixer; microfluidics; CFD; engulfment flow; helicoidal flow; vortex flow; chaotic advection; T-micromixer
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MDPI and ACS Style

Okuducu, M.B.; Aral, M.M. Novel 3-D T-Shaped Passive Micromixer Design with Helicoidal Flows. Processes 2019, 7, 637.

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