What the study found
The study found a transition from an elasticity-dominated regime to an elasto-viscous regime in the coalescence of concentrated polymer droplets.
Why the authors say this matters
The authors conclude that these results advance understanding of droplet coalescence and highlight the role of viscoelastic effects in complex fluids. The study suggests that common assumptions used to estimate axial curvature are not universal.
What the researchers tested
The researchers studied the merging of viscoelastic droplets, which are droplets whose fluids have both viscous and elastic behavior because they contain polymers. They used experimental measurements of interface curvature and numerical simulations based on a volume-of-fluid framework with the exponential Phan-Thien-Tanner model.
What worked and what didn't
Experimental measurements of interface curvature showed that common assumptions used to estimate axial curvature were not universal. The numerical simulations reproduced viscoelastic neck growth in good agreement with the experiments.
What to keep in mind
The abstract does not describe specific limitations or caveats beyond the statement that the common axial-curvature assumptions are not universal.
Key points
- The study reports a transition from an elasticity-dominated regime to an elasto-viscous regime in droplet coalescence.
- The droplets were concentrated polymer droplets, a type of viscoelastic fluid.
- Measurements of interface curvature showed that common assumptions for estimating axial curvature were not universal.
- Simulations using a volume-of-fluid framework and the exponential Phan-Thien-Tanner model matched the experiments well.
- The authors say the findings advance understanding of droplet coalescence and viscoelastic effects in complex fluids.
Disclosure
- Research title:
- Viscoelastic droplets show an elasto-viscous coalescence regime
- Authors:
- Pallavi Katre, Bimalendu Mahapatra, Manaswita Karmakar, Sarang Jagdish, Navin Kumar Chandra, Aloke Kumar
- Institutions:
- Indian Institute of Science Bangalore, Indian Institute of Technology Indore, Aix-Marseille Université, Institut Universitaire des Systèmes Thermiques Industriels
- Publication date:
- 2026-04-24
- OpenAlex record:
- View
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