[en] We have studied the splashing dynamics of water drops impacting granular layers. Depending on the drop kinetic energy, various shapes are observed for the resulting craters. Experimental parameters that have been considered are : the size of the millimetric droplets ; the height of the free fall, ranging from 1.5 cm to 100 cm ; and, the diam- eter of the grain. As the drop is impacting the sand layer, energy is dissipated and a splash of sand occurs. Meanwhile, surface tension, in- ertia and viscosity compete, leading to strong deformations of the drop which depend on the experimental conditions. Just after the drop en- ters into contact with the sand, imbibition takes place and increases the apparent viscosity of the fluid. The drop motion is stopped by this phenomenon. Images and fast-video recordings of the impact allowed to find scaling laws for the crater morphology and size.
<br />This abstract is related to a fluid dynamics video for the APS DFD gallery of fluid motion 2010.
Disciplines :
Physics
Author, co-author :
Delon, Giles ; Université de Liège - ULiège > Département de physique > Optofluidique
Terwagne, Denis ; Université de Liège - ULiège > Département de physique > Physique statistique
Adami, Nicolas ; Université de Liège - ULiège > Département de physique > Optofluidique
Bronfort, Ariane ; Université de Liège - ULiège > Département de physique > Optofluidique
Vandewalle, Nicolas ; Université de Liège - ULiège > Département de physique > Physique statistique
Dorbolo, Stéphane ; Université de Liège - ULiège > Département de physique > Physique statistique
Caps, Hervé ; Université de Liège - ULiège > Département de physique > Optofluidique