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Main Title: Flow Properties Inferred from Generalized Maxwell Models
Author(s): Hess, Siegfried
Arlt, Bastian
Heidenreich, Sebastian
Ilg, Patrick
Goddard, Chris
Hess, Ortwin
Type: Article
Language Code: en
Abstract: The generalized Maxwell model is formulated as a nonlinear relaxation equation for the symmetric traceless stress tensor. The relaxation term of the equation involves the derivative of a potential function with respect to the stress tensor. Two special cases for this potential referred to as “isotropic” and “anisotropic” are considered. In the first case, the potential solely depends on the second scalar invariant, viz. the norm of the tensor. In the second case, also a dependence on the third scalar invariant, essentially the determinant, is taken into account in analogy to the Landau-de Gennes potential of nematic liquid crystals. Rheological consequences of the model are presented for a plane Couette flow with an imposed shear rate. The non-Newtonian viscosity and the normal stress differences are analyzed for stationary solutions. The dependence on the model parameters is discussed in detail. In particular, the occurrence of a shear-thickening behaviour is studied. The possibility to describe substances with yield stress and the existence of non-stationary, stick-slip-like solutions are pointed out. The extension of the model to magneto-rheological fluids is indicated.
Issue Date: 2009
Date Available: 1-Oct-2018
DDC Class: 530 Physik
Subject(s): generalized Maxwell model
non-Newtonian viscosity
normal stress differences
magneto-rheological behaviour
Sponsor/Funder: DFG, SPP 1104, Kolloidale magnetische Flüssigkeiten: Grundlagen, Entwicklung und Anwendung neuartiger Ferrofluide
DFG, SFB 448, Mesoskopisch strukturierte Verbundsysteme
Journal Title: Zeitschrift für Naturforschung A
Publisher: De Gruyter
Publisher Place: Berlin
Volume: 64
Issue: 1-2
Publisher DOI: 10.1515/zna-2009-1-213
Page Start: 81
Page End: 95
EISSN: 1865-7109
ISSN: 0932-0784
Appears in Collections:Inst. Theoretische Physik » Publications

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