Influence of shear banding of polymeric fluids on the shape of rheological curves
Автор: Kuznetsova Yuliya Leonidovna, Skulskiy Oleg Ivanovich
Журнал: Вычислительная механика сплошных сред @journal-icmm
Статья в выпуске: 4 т.11, 2018 года.
Бесплатный доступ
The recently discovered effect of shear banding in polymer fluids has provoked great interest in studying basic physics underlying this effect, which can also be considered as the main mechanism responsible for the appearance of specific features of polymer liquids in rheometric flows. In this paper, we study the influence of shear banding in polymeric fluids on the shape of the torque-angular velocity curve obtained using a coaxial cylinder sensor system during the experiments on a rotational rheometer. A modified Vinogradov-Pokrovsky model with parameters ensuring а non-monotonic flow curve was used to simulate shear banding. Analytical relations for determination of velocity and stress fields at a given torque are found. A numerical method for establishing stationary solutions from the state of rest is proposed. It was found that the torque-angular velocity curve, which was plotted on the basis of the modified Vinogradov-Pokrovsky model for the controlled velocity of rotation of the cylinder, qualitatively changes its shape under different loading conditions...
Polymer fluids, shear banding, modified vinogradov-pokrovsky model, non-monotonic flow curve, plateau and hysteresis loop, numerical simulation
Короткий адрес: https://sciup.org/143166070
IDR: 143166070 | DOI: 10.7242/1999-6691/2018.11.4.33