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Comparison of Micro-Mixing in Time Pulsed Newtonian Fluid and Viscoelastic Fluid

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
School of Physics and Electronics, Guangzhou University, Guangzhou 510000, China
Department of Biomedical Engineering and Biotechnology, University of Massachusetts Lowell, Lowell, MA 01854, USA
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Micromachines 2019, 10(4), 262;
Received: 17 February 2019 / Revised: 12 April 2019 / Accepted: 16 April 2019 / Published: 18 April 2019
(This article belongs to the Special Issue Optofluidics 2018)
PDF [4684 KB, uploaded 25 April 2019]


Fluid mixing plays an essential role in many microfluidic applications. Here, we compare the mixing in time pulsing flows for both a Newtonian fluid and a viscoelastic fluid at different pulsing frequencies. In general, the mixing degree in the viscoelastic fluid is higher than that in the Newtonian fluid. Particularly, the mixing in Newtonian fluid with time pulsing is decreased when the Reynolds number Re is between 0.002 and 0.01, while it is enhanced when Re is between 0.1 and 0.2 compared with that at a constant flow rate. In the viscoelastic fluid, on the other hand, the time pulsing does not change the mixing degree when the Weissenberg number Wi 20, while a larger mixing degree is realized at a higher pulsing frequency when Wi = 50. View Full-Text
Keywords: microfluidic mixing; pulsed flow; viscoelastic fluid; Newtonian fluid microfluidic mixing; pulsed flow; viscoelastic fluid; Newtonian fluid

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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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Zhang, M.; Zhang, W.; Wu, Z.; Shen, Y.; Chen, Y.; Lan, C.; Li, F.; Cai, W. Comparison of Micro-Mixing in Time Pulsed Newtonian Fluid and Viscoelastic Fluid. Micromachines 2019, 10, 262.

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