| Flow-induced birefringence and particle tracking velocimetry are used to investigate the lubricated flow of a low density polyethylene melt in a cross-slot geometry. The numerical predictions of the eXtended Pom-Pom model of Verbeeten et al. in its original (XPP) [J. Rheol., 45, 823 (2001); J. Rheol., 45, 1489 (2001)] and modified (mXPP) [J. Non- Newtonian Fluid Mech., 117, 73 (2004)] version as well as those of the Giesekus model [Rheol. Acta, 5, 29 (1966); J. Non-Newtonian Fluid Mech., 11, 69 (1982)] are analyzed along selected streamlines in two-dimensional (2D) complex flows involving a mixture of shear and planar extensional deformations at two Weissenberg numbers of Wi=21 and 29. Oil film light reflections perturbing the particle tracking velocimetry data analysis together with multiple orders of retardation occurring within the laser beam close to the stagnation point prevent a conclusive discrimination between the mentioned models. Although the agreement with the experimental data is mostly qualitative, the Pom-Pom model does not overestimate the data along the cross-slot symmetry lines as reported in a previous study [J. Non-Newtonian Fluid Mech., 108, 301 (2002)]. This is a clear indicator that end effects play a central role in unlubricated cross-slot geometries having a large aspect ratio.
for LaTeX users @article{JSoulages2008-154,
author = {J. Soulages and T. Schweizer and D. C. Venerus and M. Kr\"oger and H. C. \"Ottinger},
title = {Lubricated cross-slot flow of a low density polyethylene melt},
journal = {J. Non-Newtonian Fluid Mech.},
volume = {154},
pages = {52-64},
year = {2008}
}
\bibitem{JSoulages2008-154} J. Soulages, T. Schweizer, D.C. Venerus, M. Kr\"oger, H.C. \"Ottinger,
Lubricated cross-slot flow of a low density polyethylene melt,
J. Non-Newtonian Fluid Mech. {\bf 154} (2008) 52-64.JSoulages2008-154
J. Soulages, T. Schweizer, D.C. Venerus, M. Kr\"oger, H.C. \"Ottinger
Lubricated cross-slot flow of a low density polyethylene melt
J. Non-Newtonian Fluid Mech.,154,2008,52-64 |
mk@mat.ethz.ch
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