Dresden 2006 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.112: Poster
Donnerstag, 30. März 2006, 16:00–18:00, P1
Shear-thickening and Shear-thinning behaviour in nonlinear Maxwell model Fluids. — •Bastian Arlt and Siegfried Hess — Institut für Theoretische Physik, Technische Universität, Hardenbergstraße 36, Berlin, D-10623, Germany
A generalization of the Maxwell model where the relaxation is associated with a modification of the rheological model introduced by O. Hess, Ch. Goddard and S. Hess [1] is considered. The nonlinear Maxwell model equation involves the derivative of a potential function with respect to the stress tensor. In [1] terms up to the 4th order were used. Here an alternative potential with terms up to 6th order is studied. Consequences of the model, in particular the shear stress, the first and second normal stress difference are presented for a plane Couette flow. Shear thinning, shear thickening and also the occurence of a yield stress are found. The transient and the dynamic behaviour of the components of the shear stress tensor are presented.
[1] O. Hess, Ch. Goddard, S. Hess: From Shear-Thickening and Periodic Flow Behavior to Rheo-Chaos in Nonlinear Maxwell-Model Fluids, Physica A (2005)