Microfluidic converging/diverging channels optimised for homogeneous extensional deformation
Zografos, K. and Pimenta, F. and Alves, M. A. and Oliveira, M. S. N. (2016) Microfluidic converging/diverging channels optimised for homogeneous extensional deformation. Biomicrofluidics, 10 (4). 043508. ISSN 1932-1058 (https://doi.org/10.1063/1.4954814)
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Abstract
In this work we optimise microfluidic converging/diverging geometries in order to produce constant strain-rates along the centreline of the flow, for performing studies under homogeneous extension. The design is examined for both two-dimensional and three-dimensional flows where the effects of aspect ratio and dimensionless contraction length are investigated. Initially, pressure driven flows of Newtonian fluids under creeping flow conditions are considered, which is a reasonable approximation in microfluidics, and the limits of the applicability of the design in terms of Reynolds numbers are investigated. The optimised geometry is then used for studying the flow of viscoelastic fluids and the practical limitations in terms of Weissenberg number are reported. Furthermore, the optimisation strategy is also applied for electro-osmotic driven flows, where the development of a plug-like velocity profile allows for a wider region of homogeneous extensional deformation in the flow field.
ORCID iDs
Zografos, K. ORCID: https://orcid.org/0000-0001-5732-7803, Pimenta, F., Alves, M. A. and Oliveira, M. S. N. ORCID: https://orcid.org/0000-0002-1836-4692;-
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Item type: Article ID code: 56671 Dates: DateEvent31 July 2016Published5 July 2016Published Online13 June 2016AcceptedSubjects: Technology > Mechanical engineering and machinery Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Technology and Innovation Centre > Advanced Engineering and ManufacturingDepositing user: Pure Administrator Date deposited: 15 Jun 2016 15:21 Last modified: 07 Oct 2024 00:18 URI: https://strathprints.strath.ac.uk/id/eprint/56671