Extensional rheometry of model liquids: Simulations of filament stretching
Hassager O. Wang Y. Huang Q.
1 December 2021American Institute of Physics Inc.
Physics of Fluids
2021#33Issue 12
Polymeric liquid bridges are known to fail during extension. This phenomenon of failure seemingly calls into question the operating principle of filament stretching rheometers. In these devices, a polymeric sample is initially placed between two plates. The sample is then stretched into a liquid bridge by moving the plates apart in a specified way. We here show that a steady extensional viscosity can be measured if the plates are separated in such a way that the stretch rate in the filament symmetry plane is kept constant, even for liquids highly prone to instability. Moreover, reliable measurements of the stress during a relaxation phase can be obtained as well. The conclusions are based on simulations for a number of constitutive equations, including the Newtonian liquid, the Oldroyd-B model, the differential non-stretch Rolie-Poly model, and the integral Doi-Edwards model with and without associated stretch relaxation dynamics.
Text of the article Перейти на текст статьи
Danish Polymer Center, Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, 2800, Denmark
Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Laboratory of Computational Materials Science for Energy Applications, Center for Energy and Advanced Materials Science, National Laboratory Astana, Nur-Sultan, 010000, Kazakhstan
Polymer Research Institute, Sichuan University, Chengdu, 610065, China
Danish Polymer Center
Department of Chemical and Materials Engineering
Laboratory of Computational Materials Science for Energy Applications
Polymer Research Institute
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026