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Ambient air cushions the impact of drops on solid substrates, an effectusually revealed by the entrainment of a bubble, trapped as the air squeezedunder the drop drains and liquid-solid contact occurs. The presence of airbecomes evident for impacts on very smooth surfaces, where the gas film can besustained, allowing drops to bounce without wetting the substrate. In such anon-wetting situation, Mandre & Brenner (2012) numerically and theoreticallyevidenced that two physical mechanisms can act to prevent contact: surfacetension and non-linear advection. However, the advection dominated regime hasremained hidden in experiments as liquid-solid contact prevents to realizerebounds at sufficiently large impact velocities. By performing impacts onsuperheated surfaces, in the so-called dynamical Leidenfrost regime Tran et al.(2012), we enable drop rebound at higher impact velocities, allowing us toreveal this regime. Using high-speed total internal reflection, we measure theminimal gas film thickness under impacting drops, and provide evidence for thetransition from the surface tension to the non-linear inertia dominated regime.We rationalise our measurements through scaling relationships derived bycoupling the liquid and gas dynamics, in the presence of evaporation.

Drop impact on superheated surfaces: from capillary dominance to non-linear advection dominance