Dynamics of Collapse of Air Films in Drop Impact

作者：de Ruiter Jolet^*; Oh Jung Min; van den Ende Dirk; Mugele Frieder

来源：Physical Review Letters, 2012, 108(7): 074505.

DOI：10.1103/PhysRevLett.108.074505

Liquid drops hitting solid surfaces deform substantially under the influence of the ambient air that needs to be squeezed out before the liquid actually touches the solid. Nanometer- and microsecond-resolved dual wavelength interferometry reveals a complex evolution of the interface between the drop and the gas layer underneath. For intermediate impact speeds ( We similar to 1 ... 10) the layer thickness can develop one or two local minima-reproduced in numerical calculations-that eventually lead to the nucleation of solid-liquid contact at a We-dependent radial position, from a film thickness %26gt;200 nm. Solid-liquid contact spreads at a speed involving capillarity, liquid viscosity and inertia.

• 出版日期2012-2-17