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Transient dynamics in drop impact on a superheated surface
Phys. Rev. Fluids 3, 124308 – Published 26 December, 2018
DOI: https://doi.org/10.1103/PhysRevFluids.3.124308
Abstract
When a drop impinges on a superheated surface, a Leidenfrost vapor layer forms between the drop and the surface. Transient dynamics of the layer can play a critical role for cooling in power plants but is not fully understood. Here we successfully visualize transient dynamics of the layer using ultrafast x-ray imaging. We reveal that a vapor disk with a homogeneous thickness, developed during drop impact, grows in thickness following the Fourier law. At a certain thickness (12 ± 2 μm in this study) of the vapor disk, ripples generate at its periphery due to capillary waves, resulting in significant enhancement of drop vaporization.
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