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...

Еще

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

Статья научная