Micro and macro in the dynamics of dilute polymer solutions

Monday, September 14, 2009 - 9:50am - 10:35am
EE/CS 3-180
Ravi Jagadeeshan (Monash University)
Recent developments in dilute polymer solution rheology are reviewed, and placed
within the context of the general goals of predicting the complex flow of complex
fluids. In particular, the interplay between the use of polymer kinetic theory and
continuum mechanics to advance the microscopic and the macroscopic description,
respectively, of dilute polymer solution rheology is delineated. The insight that
can be gained into the origins of the high Weissenberg number problem through an
analysis of the configurational changes undergone by a single molecule at various
locations in the flow domain is discussed in the context of flow around a cylinder
confined between flat plates. The significant role played by hydrodynamic
interactions as the source of much of the richness of the observed rheological behaviour
of dilute polymer solutions is highlighted, and the methods by which this
phenomenon can be incorporated into a macroscopic description through the use of
closure approximations and multiscale simulations is discussed.
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