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Micromachines 2017, 8(11), 325; https://doi.org/10.3390/mi8110325

A Numerical Research of Herringbone Passive Mixer at Low Reynold Number Regime

1
School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
2
Silicon Steel Department, Baosteel Co., Ltd., Shanghai 201900, China
3
Research Center for Analytical Sciences, Northeastern University, Shenyang 110819, China
4
Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 4330030, China
*
Authors to whom correspondence should be addressed.
Received: 28 September 2017 / Revised: 25 October 2017 / Accepted: 29 October 2017 / Published: 31 October 2017
(This article belongs to the Special Issue Passive Micromixers)
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Abstract

Passive mixing based on microfluidics has won its popularity for its unique advantage, including easier operation, more efficient mixing performance and higher access to high integrity. The time-scale and performance of mixing process are usually characterized by mixing quality, which has been remarkably improved due to the introduction of chaos theory into passive micro mixers. In this paper, we focus on the research of mixing phenomenon at extremely low Reynold number (Re) regime in a chaotic herringbone mixer. Three-dimensional (3D) modeling has been carried out using computational fluid dynamics (CFD) method, to simulate the chaos-enhanced advection diffusion process. Static mixing processes using pressure driven and electric field driven modes are investigated. Based on the simulation results, the effects of flow field and herringbone pattern are theoretically studied and compared. Both in pressure driven flow and electro-osmotic flow (EOF), the mixing performance is improved with a lower flow rate. Moreover, it is noted that with a same total flow rate, mixing performance is better in EOF than pressure driven flow, which is mainly due to the difference in flow field distribution of pressure driven flow and EOF. View Full-Text
Keywords: passive mixing; mixing quality; herringbone pattern; extremely low Re; electro-osmotic flow; pressure driven flow; CFD simulation passive mixing; mixing quality; herringbone pattern; extremely low Re; electro-osmotic flow; pressure driven flow; CFD simulation
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Wang, D.; Ba, D.; Liu, K.; Hao, M.; Gao, Y.; Wu, Z.; Mei, Q. A Numerical Research of Herringbone Passive Mixer at Low Reynold Number Regime. Micromachines 2017, 8, 325.

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