Droplet hurdles race

Droplet hurdles race

Hélène de Maleprade (1) , Rafid Bendimerad (2) , Christophe Clanet (1) , David Quéré (1)

1 PMMH - Physique et mécanique des milieux hétérogenes (UMR 7636)
2 LadHyX - Laboratoire d'hydrodynamique

Water is extremely mobile on non-wetting surfaces, on which it glides at high velocities. We discuss how a few indentations placed on the surface markedly slow down drops forced to hit and jump above these hurdles. The corresponding "friction" is characterized and shown to be inertial in nature, which we interpret as the result of the successive soft shocks of the drops against obstacles.

Domaines: Physique [physics]

Hélène de Maleprade, Rafid Bendimerad, Christophe Clanet, David Quéré. Droplet hurdles race. Applied Physics Letters, 2021, 118 (17), pp.171601. ⟨10.1063/5.0043908⟩. ⟨hal-03335890⟩