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https://hdl.handle.net/10216/106718
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DC Field | Value | Language |
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dc.creator | Simon J. Haward | |
dc.creator | Mónica S. N. Oliveira | |
dc.creator | Manuel A. Alves | |
dc.creator | Gareth H. McKinley | |
dc.date.accessioned | 2022-09-08T09:17:17Z | - |
dc.date.available | 2022-09-08T09:17:17Z | - |
dc.date.issued | 2012 | |
dc.identifier.issn | 0031-9007 | |
dc.identifier.other | sigarra:69242 | |
dc.identifier.uri | https://hdl.handle.net/10216/106718 | - |
dc.description.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 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.iso | eng | |
dc.relation | info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a 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.relation | info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a 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.rights | restrictedAccess | |
dc.subject | Física | |
dc.subject | Physical sciences | |
dc.title | Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry | |
dc.type | Artigo em Revista Científica Internacional | |
dc.contributor.uporto | Faculdade de Engenharia | |
dc.identifier.doi | 10.1103/physrevlett.109.128301 | |
dc.identifier.authenticus | P-002-5EV | |
dc.subject.fos | Ciências exactas e naturais::Física | |
dc.subject.fos | Natural sciences::Physical sciences | |
Appears in Collections: | FEUP - Artigo em Revista Científica Internacional |
Files in This Item:
File | Description | Size | Format | |
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69242.pdf Restricted Access | artigo original publicado | 1.27 MB | Adobe PDF | Request a copy from the Author(s) |
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