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Universality in dynamic wetting dominated by contact-line friction

2012; American Physical Society; Volume: 85; Issue: 4 Linguagem: Inglês

10.1103/physreve.85.045302

1550-2376

Andreas Carlson, Gabriele Bellani, Gustav Amberg,

Fluid Dynamics and Thin Films

We report experiments on the rapid contact-line motion present in the early stages of capillary-driven spreading of drops on dry solid substrates. The spreading data fail to follow a conventional viscous or inertial scaling. By integrating experiments and simulations, we quantify a contact-line friction ${\ensuremath{\mu}}_{f}$ which is seen to limit the speed of the rapid dynamic wetting. A scaling based on this contact-line friction is shown to yield a universal curve for the evolution of the contact-line radius as a function of time, for a range of fluid viscosities, drop sizes, and surface wettabilities.