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Successive shots showing the impact of a water drop for different grids and impact velocity . (a) , Grid no. 2 and the subsequent “rain” of droplets emerging below the grid. (b) A sequence at threshold: a single tiny droplet emerges down the grid. , Grid no. 1 inverse. (c) A double-peaked distribution of emerging droplets. , Grid no. 1.
SEM pictures (top and cross views) of a hydrophobic grid. The trapezoidal holes have and , respectively, as smaller and larger aperture.
Number of emerging droplets for direct (top) and inverse (bottom) impact configurations.
Weber number at threshold for direct (left) and inverse (right) impact configurations.
Threshold We vs relative area of the holes.
Dimensions of the different grids. is the space between holes and is the diameter of the emitted droplets.
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