Abstract
This paper is associated with a video winner of a 2018 APS/DFD Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2018.GFM.V0097
Highlights
Liquids are defined by their ability to flow freely when subjected to a shear stress
At millimetric scales, water drops eventually adhere to their solid substrate and develop a remarkable ability to resist gravity; common examples include raindrops stuck on windshields, eyeglasses, or other ordinary substrates
The liquid only sits on the tops of the micrometric textures in a fakir state, which results in a drastic reduction of contact area and a low-adhesion regime [4]
Summary
Localized pinning points are formed at the drop perimeter (top-right quadrant, as seen at 1:27 in the GFM video); the region of liquid-solid contact spreads towards the base center (bottom-right quadrant, 1:38 in the video) until eventually covering the entire area (bottom-left, 1:42 in the video). It is constructed by assembling a grayscale composite image of the diameter (−rc < r < rc) of the droplet base as a function of the time t after deposition. Liquid-solid contact points are first restricted to the drop edges (white dashed lines, at r = ±rc) as the rest of the area is covered by a central bubble [Fig. 1(c)].
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