Dynamics of high viscosity contrast confluent microfluidic flows

Kurdzinski, M, Gol, B, Co Hee, A, Thurgood, P, Zhu, J, Petersen, P, Mitchell, A and Khoshmanesh, K 2017, 'Dynamics of high viscosity contrast confluent microfluidic flows', Scientific Reports, vol. 7, no. 1, 5945, pp. 1-11.


Document type: Journal Article
Collection: Journal Articles

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Title Dynamics of high viscosity contrast confluent microfluidic flows
Author(s) Kurdzinski, M
Gol, B
Co Hee, A
Thurgood, P
Zhu, J
Petersen, P
Mitchell, A
Khoshmanesh, K
Year 2017
Journal name Scientific Reports
Volume number 7
Issue number 1
Article Number 5945
Start page 1
End page 11
Total pages 11
Publisher Nature Publishing Group
Abstract The laminar nature of microfluidic flows is most elegantly demonstrated via the confluence of two fluids forming two stable parallel flows within a single channel meeting at a highly stable interface. However, maintenance of laminar conditions can become complicated when there is a large viscosity contrast between the neighbouring flows leading to unique instability patterns along their interface. Here, we study the dynamics of high viscosity contrast confluent flows - specifically a core flow made of highly viscous glycerol confined by sheath flows made of water within a microfluidic flow focusing system. Our experiments indicate the formation of tapered core structures along the middle of the channel. Increasing the sheath flow rate shortens the tapered core, and importantly induces local instability patterns along the interface of core-sheath flows. The dynamics of such tapered core structures is governed by the intensity of instability patterns and the length of the core, according to which the core structure can experience stable, disturbed, broken or oscillated regimes. We have studied the dynamics of tapered core structures under these regimes. In particular, we have analysed the amplitude and frequency of core displacements during the broken core and oscillating core regimes, which have not been investigated before.
Subject Electrical and Electronic Engineering not elsewhere classified
Microelectromechanical Systems (MEMS)
Fluid Physics
DOI - identifier 10.1038/s41598-017-06260-6
Copyright notice © 2017 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. To view a copy of this license, visit: http://creativecommons.org/licenses/by/4.0/.
ISSN 2045-2322
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