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Article

Inertial Micromixing in Curved Serpentine Micromixers with Different Curve Angles

1
Faculty of Engineering and Natural Science, Sabanci University, 34956 Istanbul, Turkey
2
Sabanci University Nanotechnology and Application Center (SUNUM), Sabanci University, 34956 Istanbul, Turkey
3
Center of Excellence for Functional Surfaces and Interfaces for Nano-Diagnostics (EFSUN), Sabanci University, 34956 Istanbul, Turkey
*
Author to whom correspondence should be addressed.
Fluids 2019, 4(4), 204; https://doi.org/10.3390/fluids4040204
Received: 28 October 2019 / Revised: 1 December 2019 / Accepted: 5 December 2019 / Published: 8 December 2019
Micromixers are of considerable significance in many microfluidics system applications, from chemical reactions to biological analysis processes. Passive micromixers, which rely solely on their geometry, have the advantages of low cost and a less-complex fabrication process. Dean vortices seen in curved microchannels are one of the useful tools to enhance micromixing. In this study, the effects of curve angle on micromixing were experimentally investigated in three curved serpentine micromixers consisting of ten segments with curve angles of 180 ° , 230 ° and 280 ° , at Dean numbers between 12 and 87. To characterize and compare the performance of the micromixers, fluorescence intensity maps and mixing indices were utilized. Accordingly, the micromixer having segments with 280 ° curve angle had significantly higher mixing index values up to the Dean number 60 and outperformed the other two micromixers. This was due to the severe distortion of flow streamlines by Dean vortices and the occurrence of chaotic advection at lower Dean numbers. Beyond the Dean number of 70, no difference was observed in the performance of the micromixers and the mixing index at their outlets had the asymptotic value of 0.93 ± 0.02. Furthermore, the flow behavior of the micromixers was numerically simulated to provide further insight about the mixing phenomena. View Full-Text
Keywords: inertial microfluidics; passive micromixing; curved serpentine micromixer; dean vortices; chaotic advection inertial microfluidics; passive micromixing; curved serpentine micromixer; dean vortices; chaotic advection
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MDPI and ACS Style

Alijani, H.; Özbey, A.; Karimzadehkhouei, M.; Koşar, A. Inertial Micromixing in Curved Serpentine Micromixers with Different Curve Angles. Fluids 2019, 4, 204. https://doi.org/10.3390/fluids4040204

AMA Style

Alijani H, Özbey A, Karimzadehkhouei M, Koşar A. Inertial Micromixing in Curved Serpentine Micromixers with Different Curve Angles. Fluids. 2019; 4(4):204. https://doi.org/10.3390/fluids4040204

Chicago/Turabian Style

Alijani, Hossein; Özbey, Arzu; Karimzadehkhouei, Mehrdad; Koşar, Ali. 2019. "Inertial Micromixing in Curved Serpentine Micromixers with Different Curve Angles" Fluids 4, no. 4: 204. https://doi.org/10.3390/fluids4040204

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