Drops impacting a sieve.
We study experimentally the impact of liquid drops against thin plates pierced with small holes. When the drop is larger than the hole, different situations can occur: (i) at a small velocity, the drop is entirely captured by the plate; (ii) above a threshold speed, some liquid is ejected below the surface. We characterize this critical speed and these two different situations, focusing on the forces able to slow down the drop. We also quantify the amount of liquid ejected out of the hole.
Lorenceau
Elise
E
Laboratoire de Physique de la Matière Condensée, UMR 7125 du CNRS, Collège de France, 75231 Paris cedex 05, France.
Quéré
David
D