4th International workshop on nonequilibrium thermodynamics and complex fluids

	IWNET 2006	4th International workshop on nonequilibrium thermodynamics and complex fluids 3-7 september 2006, Rhodes, Greece

Home Scope Location Speakers Program Abstracts Author index Organizing Committee Scientific Committee Venue & Accomodation Registration News Contact		ORAL PRESENTATION Session: 4 Complex fluid deformation and rheology: Theories and thermodynamic relationships (scheduled: Tuesday, 10:20 ) Polymer rheology and nonlinear transient elasticity O. Müller¹, M. Liu¹, H. Pleiner², H.R. Brand³ ¹ Theoretical Physics, University of Tübingen, Germany ² Max Planck Institute for Polymer Research, Mainz, Germany ³ Theoretical Physics III, University of Bayreuth, Germany We simplify our previously derived general macroscopic equations incorporating transient elasticity by assuming incompressibility as well as linear response for the dissipation. We take into account terms up to quartic order in the elasticity (3 independent coefficients) and have in addition only two dissipative constants: the shear viscosity and the relaxation time of transient elasticity. This simple model can account for many experimentally observed rheological effects qualitatively and sometimes even quantitatively. Flow phenomena discussed include the Weissenberg effect, overshoot, relaxation spectra and elongational flows. © IWNET 2006

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