Extensional rheometry of model liquids: Simulations of filament stretching

Ole Hassager*, Yanwei Wang, Qian Huang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

119 Downloads (Pure)


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.
Original languageEnglish
Article number123108
JournalPhysics of Fluids
Number of pages12
Publication statusPublished - 2021


Dive into the research topics of 'Extensional rheometry of model liquids: Simulations of filament stretching'. Together they form a unique fingerprint.

Cite this