Universality in dynamic wetting dominated by contact line friction

Details Universality in dynamic wetting dominated by contact line friction Universality in dynamic wetting dominated by contact line friction

2011-11-04

arxiv.org/abs/1111.1214v2

Physics

Fluid Dynamics

Scientific paper

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 fails to follow a conventional viscous or inertial scaling. By integrating experiments and simulations, we quantify a contact line friction ($\mu_f$), 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.

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