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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
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Hamid Tamaddon-Jahromi
Rheologica Acta, Volume: 55, Issue: 5, Pages: 373 - 396
Swansea University Authors:
Michael Webster , Hamid Tamaddon-Jahromi
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DOI (Published version): 10.1007/s00397-016-0924-9
Abstract
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 influ...
| Published in: | Rheologica Acta |
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| Published: |
2016
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa27560 |
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| Abstract: |
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. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
5 |
| Start Page: |
373 |
| End Page: |
396 |