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Micromachines 2014, 5(4), 1270-1286; doi:10.3390/mi5041270

The Effect of Inertia on the Flow and Mixing Characteristics of a Chaotic Serpentine Mixer

1
School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang-City, Gyeonggi-do 412-792, Korea
2
Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
This paper is an extended version of our paper published in Asian Conference on Mixing 2010, Jeju, Korea, 19–22 October 2010.
*
Author to whom correspondence should be addressed.
Received: 9 October 2014 / Revised: 23 November 2014 / Accepted: 24 November 2014 / Published: 27 November 2014
(This article belongs to the Special Issue Micromixer & Micromixing)
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Abstract

As an extension of our previous study, the flow and mixing characteristics of a serpentine mixer in non-creeping flow conditions are investigated numerically. A periodic velocity field is obtained for each spatially periodic channel with the Reynolds number (Re) ranging from 0.1 to 70 and the channel aspect ratio from 0.25 to one. The flow kinematics is visualized by plotting the manifold of the deforming interface between two fluids. The progress of mixing affected by the Reynolds number and the channel geometry is characterized by a measure of mixing, the intensity of segregation, calculated using the concentration distribution. A mixer with a lower aspect ratio, which is a poor mixer in the creeping flow regime, turns out to be an efficient one above a threshold value of the Reynolds number, Re = 50. This is due to the combined effect of the enhanced rotational motion of fluid particles and back flows near the bends of the channel driven by inertia. As for a mixer with a higher aspect ratio, the intensity of segregation has its maximum around Re = 30, implying that inertia does not always have a positive influence on mixing in this mixer. View Full-Text
Keywords: chaotic mixing; micromixer; serpentine channel; numerical simulation chaotic mixing; micromixer; serpentine channel; numerical simulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kang, T.G.; Anderson, P.D. The Effect of Inertia on the Flow and Mixing Characteristics of a Chaotic Serpentine Mixer. Micromachines 2014, 5, 1270-1286.

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