1 research outputs found
Liquid jet eruption from hollow relaxation
A cavity hollowed out on a free liquid surface is relaxing, forming an
intense liquid jet. Using a model experiment where a short air pulse sculpts an
initial large crater, we depict the different stages in the gravitational
cavity collapse and in the jet formation. Prior eversion, all cavity profiles
are found to exhibit a shape similarity. Following hollow relaxation, a
universal scaling law establishing an unexpected relation between the jet
eruption velocity, the initial cavity geometry and the liquid viscosity is
evidenced experimentally. On further analysing the jet forms we demonstrate
that the stretched liquid jet also presents shape similarity. Considering that
the jet shape is a signature of the initial flow focusing, we elaborate a
simple model capturing the key features of the erupting jet velocity scaling