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Numerical vs experimental pressure drops for Boger fluids in sharp-corner contraction flow
J. E. López-Aguilar,
H. R. Tamaddon-Jahromi,
M. F. Webster,
K. Walters,
Michael Webster 
,
Hamid Tamaddon-Jahromi
,
Hamid Tamaddon-Jahromi
Physics of Fluids, Volume: 28, Issue: 10, Start page: 103104
Swansea University Authors:
Michael Webster , Hamid Tamaddon-Jahromi
-
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DOI (Published version): 10.1063/1.4966022
Abstract
This paper addresses the problem of matching experimental findings with numerical prediction for the extreme experimental levels of pressure-drops observed in the 4:1 sharp-corner contraction flows, as reported by Nigen and Walters [“Viscoelastic contraction flows: Comparison of axisymmetric and pla...
| Published in: | Physics of Fluids |
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| ISSN: | 1070-6631 1089-7666 |
| Published: |
2016
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa31238 |
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| Abstract: |
This paper addresses the problem of matching experimental findings with numerical prediction for the extreme experimental levels of pressure-drops observed in the 4:1 sharp-corner contraction flows, as reported by Nigen and Walters [“Viscoelastic contraction flows: Comparison of axisymmetric and planar configurations,” J. Non- Newtonian Fluid Mech. 102, 343–359 (2002)]. In this connection, we report on significant success in achieving quantitative agreement between predictions and experiments. This has been made possible by using a new swanINNFM model, employing an additional dissipative function. Notably, one can observe that extremely large pressure-drops may be attained with a suitable selection of the extensional viscous time scale. In addition, and on vortex structure, the early and immediate vortex enhancement for Boger fluids in axisymmetric contractions has also been reproduced, which is shown to be absent in planar counterparts. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
10 |
| Start Page: |
103104 |