Rheological properties of dilute polymer solutions: An extended thermodynamic approach |
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| Authors: | G Lebon P C Dauby A Palumbo G Valenti |
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| Institution: | (1) Institut de Physique, Université de Liège, B5, Sart Tilman, 4000 Liège, Belgium;(2) University of Reggio di Calabria Engineering Faculty Facolta di Ingeneria, 89128 Reggio di Calabria, Italy |
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| Abstract: | It is shown that extended irreversible thermodynamics can be used to account for the shear rate and frequency dependences of several material functions like shear viscosity, first and second normal stress coefficients, dynamic viscosity and storage modulus. Comparison with experimental data on steady shearing and small oscillatory shearing flows is performed. A good agreement between the model and experiment is reached in a wide scale of variation of the shear rate and the frequency of oscillations. The relation between the present model which includes quadratic terms in the pressure tensor and the Giesekus model is also examined. |
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| Keywords: | Thermodynamics shearviscosity normalstress coefficients dynamicviscosity storagemodulus Giesekus model |
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