AI Article Synopsis
- Small drops on partially wetting surfaces change shape based on their capillary number (Ca); at low Ca, they have a smooth rounded outline.
- At intermediate Ca, the drops form a corner at the back, with the angle increasing from flat to 60 degrees as the velocity rises.
- At higher Ca values, the drops develop a cusped tail that creates smaller droplets, referred to as "pearls," and these transformations can be explained by the dynamic contact angle along the contact line.
Article Abstract
Small drops sliding down a partially wetting substrate bifurcate between different shapes depending on their capillary number Ca. At low Ca, they are delimited by a rounded, smooth contact line. At intermediate values they develop a corner at the trailing edge, the angle of which evolves from flat to 60 degrees with increasing velocity. Further up, they exhibit a cusped tail that emits smaller drops ("pearls"). These bifurcations may be qualitatively and quantitatively recovered by considering the dynamic contact angle along the contact line.
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| http://dx.doi.org/10.1103/PhysRevLett.87.036102 | DOI Listing |
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