Raindrop Impact on a Sandy Surface

2014 APS/DFD Gallery of Fluid Motion Award Winner This set of videos shows the impact of water drops on the surface of granular particles—a phenomenon that is likely familiar to all of us who have watched raindrops splashing in a backyard or on a beach. The high-speed photography reveals the detailed liquid-drop impact dynamics at various impact velocities. Such information allows us to construct a simple model for describing the morphology of raindrop imprints in a granular bed. Surprisingly, we found tha