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Extracting extensional properties through excess pressure drop estimation in axisymmetric contraction and expansion flows for constant shear viscosity, extension strain-hardening fluids
RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Food and Bioscience, Structure Design. Chalmers University of Technology, Sweden.
Swansea University, UK.
RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Food and Bioscience, Structure Design. Chalmers University of Technology, Sweden.ORCID-id: 0000-0003-0310-4465
Swansea University, UK.
2016 (engelsk)Inngår i: Rheologica Acta, ISSN 0035-4511, E-ISSN 1435-1528, Vol. 55, nr 5, s. 373-396Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this study, hyperbolic contraction–expansion flow (HCF) devices have been investigated with the specific aim of devising new experimental measuring systems for extensional rheological properties. To this end, a hyperbolic contraction–expansion configuration has been designed to minimize the influence of shear in the flow. Experiments have been conducted using well-characterized model fluids, alongside simulations using a viscoelastic White–Metzner/FENE-CR model and finite element/finite volume analysis. Here, the application of appropriate rheological models to reproduce quantitative pressure drop predictions for constant shear viscosity fluids has been investigated, in order to extract the relevant extensional properties for the various test fluids in question. Accordingly, experimental evaluation of the hyperbolic contraction–expansion configuration has shown rising corrected pressure drops with increasing elastic behaviour (De=0∼16), evidence which has been corroborated through numerical prediction. Moreover, theoretical to predicted solution correspondence has been established between extensional viscosity and first normal stress difference. This leads to a practical means to measure extensional viscosity for elastic fluids, obtained through the derived pressure drop data in these HCF devices.

sted, utgiver, år, opplag, sider
Springer Verlag , 2016. Vol. 55, nr 5, s. 373-396
Emneord [en]
Axisymmetric contraction–expansion, Boger fluid, Extensional flow, Hyperbolic contraction, Pressure drop, Viscoelastic fluid
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-133DOI: 10.1007/s00397-016-0924-9ISBN: 00354511 (ISSN) (tryckt)OAI: oai:DiVA.org:ri-133DiVA, id: diva2:932828
Tilgjengelig fra: 2016-06-02 Laget: 2016-06-02 Sist oppdatert: 2019-06-14bibliografisk kontrollert

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