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Tommi Borg, Esko J. Paakkonen
Linear viscoelastic model for different flows based on control theory
Appl. Rheol. 25:6 (2015) 64304 (10 pages)
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Traditional Maxwell-type models have limitations when applied to the flows of real polymers containing macromolecules
and complex microstructures. The main weakness of Maxwell models is the use of relaxation-time spectra that conducts to
ill-posed problems in integral functions, and shear-induced relaxation spectrum transformations may lead to non-linearity.
In contrast, control theory, which has apparently not been applied in rheology so far, enables modelling without knowledge
of relaxation times. This study used viscoelastic constitutive equations derived from control theory and a new polymer fingerprint,
which we call the rheologically effective distribution (RED). The study shows that a relaxation-time scheme is not
essential to describe viscoelasticity, and applying the RED to computational modelling provides many theoretical and practical
benefits, including giving higher accuracy. The proposed model is versatile and presents viscoelastic formulas for shear viscosity
and other types of flow. Furthermore, the new model provides explanations for the empirical Cox-Merz rule and a
power law behavior, the origin of which is frequently disputed in rheology.
► Cite this publication as follows:
Borg T, Paakkonen EJ: Linear viscoelastic model for different flows based on control theory, Appl. Rheol. 25 (2015) 64304.
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