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ORAL PRESENTATION
Session: 7 Applications to complex materials: glasses, micelles, colloids, blends, interfaces
(scheduled: Thursday, 10:20 )
Flow of Polymer blends between Concentric Cylinders
M. Dressler1, B.J. Edwards2, E.J. Windhab1
1 Institute of Food Science and Nutrition, ETH Zurich, Switzerland
2 Department of Chemical Engineering, University of Tennessee, Knoxville, TN 37996-2200, USA
A thermodynamically consistent model for polymer blends with matrix phase viscoelasticity and break-up/coalescence is solved for laminar flows in the gap between concentric cylinders. The model has been developed using a Hamiltonian framework of non-equilibrium Thermodynamics. The model is solved for Poiseuille (axial), Couette (angular), and mixed Couette-Poiseuille (helical) flow to understand qualitatively viscometric material properties and droplet deformation in non-homogeneous shearing flows. Therefore, the model equations are formulated in terms of a two-point boundary value problem and a shooting algorithm is adopted to compute the non-linear flow fields together with the elastic stresses, the droplet shapes, and the break-up/coalescence rates in the gap. We investigate the profiles of the stress tensor components in connection with the droplet characteristics, we valuate viscometric material functions at the wall, and we discuss the narrow gap approximation. Moreover, we examine the influence of centrifugal forces on the flow behavior, and in particular on the break-up/coalescence rates in the gap for the three flows. © IWNET 2006
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and Kleanthi for IWNET 2006