Monday, November 21, 2016
Droplet Impact - PHYSICS
A drop of water that impacts a flat post will form a liquid sheet that eventually breaks apart into droplets when surface tension can no longer hold the water together against the power of momentum flinging the water outward.
But what happens if that initial drop of water is filled with particles? Initially, the particle-laden drop’s impact is similar to the water’s – it strikes the post and expands radially in a sheet that is uniformly filled with particles. But then the particles begin to cluster due to capillary attraction, which causes particles at a fluid interface to clump up.
The clumping creates holes in the sheet which rapidly expand until the liquid breaks apart into many particle-filled droplets.
Story via FYFD