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- W2079175073 abstract "It is well-known that a drop of water deposited on a superhydrophobic surface adopts a quasispherical shape to minimize its interaction with the substrate. As a result, the equilibrium contact angle, eq, that the drop makes with the surface can approach 180° Fig. 1 . Also, the literature documents the impact dynamics of fluid droplets on such surfaces. In particular, a water droplet can bounce off of a superhydrophobic substrate. Here, we use rotational effects to further spread out the drop during impact. We experiment with releasing a millimeter-size drop of milk above the center of a spinning disk whose surface is covered by soot to create a superhydrophobic substrate Fig. 1 . By varying the velocity of impact V and the rotation rate of the disk, we observe a rich variety of dynamics including bouncing, retracting, and dewetting. Figure 2 shows high-speed images illustrating a typical dewetting experiment obtained for large values of both V and . Upon impact, the drop deforms into a liquid sheet that spreads out until it reaches a maximum diameter Figs. 2 a and 2 b . At the same time, due to rotational effects, its thickness continually decreases Fig. 2 c and upon reaching a critical value, the drop dewets via the nucleation of a dry spot at the center of the spreading liquid sheet Fig. 2 d . The hole in the sheet then grows, which leads to the ejection of the drop from the substrate Figs. 2 e and 2 f . We rationalize these results using simple physical arguments comparing the surface tension effects with rotation-driven spreading and thinning. For lower values of V and , the drop bounces while for intermediate speeds the drop spreads on the substrate, retracts, and then breaks up into smaller droplets Fig. 3 . In conclusion, by varying the values of V and , we obtain a variety of new dynamical behaviors for drop impact on superhydrophobic substrates, from a simple bounce to “spiders” and “black holes” Figs. 3 a –3 c ." @default.
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- W2079175073 date "2008-09-01" @default.
- W2079175073 modified "2023-09-23" @default.
- W2079175073 title "“Black hole” nucleation in a splash of milk" @default.
- W2079175073 cites W2030827488 @default.
- W2079175073 doi "https://doi.org/10.1063/1.2973667" @default.
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