Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/106718
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dc.creatorSimon J. Haward
dc.creatorMónica S. N. Oliveira
dc.creatorManuel A. Alves
dc.creatorGareth H. McKinley
dc.date.accessioned2019-02-03T09:28:17Z-
dc.date.available2019-02-03T09:28:17Z-
dc.date.issued2012
dc.identifier.issn0031-9007
dc.identifier.othersigarra:69242
dc.identifier.urihttps://repositorio-aberto.up.pt/handle/10216/106718-
dc.description.abstractA 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 Wi(crit) approximate to 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 s(-1) <= (epsilon) over dot <= 435 s(-1)) and are also in close agreement with numerical simulations performed by using a finitely extensible nonlinear elastic dumbbell model.
dc.language.isoeng
dc.relationinfo:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EME-MFE/114322/2009/EXTENSION - Escoamento extensional de fluidos complexos em microcanais/EXTENSION
dc.relationinfo:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-FTT/118716/2010/Design de um "reómetro-num-chip" para o desenvolvimento de fluidos análogos ao sangue/RheoChip
dc.rightsrestrictedAccess
dc.subjectFísica
dc.subjectPhysical sciences
dc.titleOptimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry
dc.typeArtigo em Revista Científica Internacional
dc.contributor.uportoFaculdade de Engenharia
dc.identifier.doi10.1103/physrevlett.109.128301
dc.identifier.authenticusP-002-5EV
dc.subject.fosCiências exactas e naturais::Física
dc.subject.fosNatural sciences::Physical sciences
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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