| We describe a novel optical cross-slot channel rheometer whose front and back viewing windows are lubricated so that a complex two-dimensional, isothermal melt flow is created. Flow-induced birefringence and particle tracking velocimetry are reviewed and used to investigate mixed flows of shear and planar elongation of a low density polyethylene melt. The new device solves the issue of end effects in flow birefringence experiments where no variations of the optical properties along the light path are expected. It greatly facilitates the interpretation of stress field data by providing reliable measurements of the polymer melt extinction angle χ and retardation δ with a spatial resolution of one tenth of a millimeter. The rheo-optical device at the same time offers enhanced temperature control and increased optical accuracy due to an improved laser beam shaping. Capabilities and performances of this unique type of lubricated rheometer are discussed in detail and compared with previous approaches.
for LaTeX users @article{JSoulages2008-150,
author = {J. Soulages and T. Schweizer and D. C. Venerus and J. Hostettler and F. Mettler and M. Kr\"oger and H. C. \"Ottinger},
title = {Lubricated optical rheometer for the study of two-dimensional complex flows of polymer melts},
journal = {J. Non-Newtonian Fluid Mech.},
volume = {150},
pages = {43-55},
year = {2008}
}
\bibitem{JSoulages2008-150} J. Soulages, T. Schweizer, D.C. Venerus, J. Hostettler, F. Mettler, M. Kr\"oger, H.C. \"Ottinger,
Lubricated optical rheometer for the study of two-dimensional complex flows of polymer melts,
J. Non-Newtonian Fluid Mech. {\bf 150} (2008) 43-55.JSoulages2008-150
J. Soulages, T. Schweizer, D.C. Venerus, J. Hostettler, F. Mettler, M. Kr\"oger, H.C. \"Ottinger
Lubricated optical rheometer for the study of two-dimensional complex flows of polymer melts
J. Non-Newtonian Fluid Mech.,150,2008,43-55 |
mk@mat.ethz.ch
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