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Drop coalescence begins at a singular point contact in continuum theory. Capillary stresses open the bridge; viscous stresses resist. Three nested views follow the drops, the growing bridge and its sharp meniscus. @durhamphysics.bsky.social @durham.ac.uk youtu.be/riY7qGWCSKs

youtu.beHierarchy of scales in viscous drop coalescenceYouTube video by CoMPhy Lab

3/10/26, 2:37 pm0 reposts1 like

Vatsal Sanjay

@comphy-lab.org

For the broader connection to singularities in soft matter, see: arxiv.org/abs/2608.11060

arxiv.orgSingularities in Soft Matter SystemsWhen a liquid thread pinches off, its neck thins as it separates into two unconnected regions. Using continuum mechanics, we can predict that the neck reaches zero radius in finite time while its curv...