Transient contraction flow of a nonlinear viscoelastic fluid |
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| Authors: | Stefan Descher Olaf Wünsch |
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| Affiliation: | Institute of Mechanics, Chair of Fluid Mechanics, University of Kassel, D-34125 Kassel |
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| Abstract: | The unsteady behavior of a Phan-Thien-Tanner fluid in a pressure driven contraction flow is investigated. Calculations are performed using the log-conformation reformulation and block coupled pressure correction. Studies are carried out for the Deborah number De of the process and the model's extension parameter α. It is shown that for very small and very large De the fluid responds newtonian whereas for moderate De damped oscillations of the volume flux can be observed. The studies for α show that the flow is shear dominant despite the extensional flow character of contractions. (© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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