Optimized cross-slot flow geometry for microfluidic extension rheometry
Haward, S.J. and Oliveira, Monica and Alves, M.A. and McKinley, G.H. (2012) Optimized cross-slot flow geometry for microfluidic extension rheometry. Physical Review Letters, 109 (12). 128301. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.109.128301)
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Abstract
A precision-machined cross-slot flow geometry with a shape that has been optimized by numerical simulation of the fluid kinematics is fabricated and used to measure the extensional viscosity of a dilute polymer solution. Full-field birefringence microscopy is used to monitor the evolution and growth of macromolecular anisotropy along the stagnation point streamline, and we observe the formation of a strong and uniform birefringent strand when the dimensionless flow strength exceeds a critical Weissenberg number Wicrit 0:5. Birefringence and bulk pressure drop measurements provide self consistent estimates of the planar extensional viscosity of the fluid over a wide range of deformation rates (26 s1 "_ 435 s1) and are also in close agreement with numerical simulations performed by using a finitely extensible nonlinear elastic dumbbell model.
ORCID iDs
Haward, S.J., Oliveira, Monica ORCID: https://orcid.org/0000-0002-1836-4692, Alves, M.A. and McKinley, G.H.;-
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Item type: Article ID code: 41325 Dates: DateEvent17 September 2012PublishedSubjects: 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: 02 Oct 2012 10:38 Last modified: 03 Oct 2024 00:21 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/41325