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L’expérience est très facile et peut se réaliser en cuisine. Chauffez une poêle à plus de 200 °C et versez une goutte d’eau à sa surface. Celle-ci se met à danser dans tous les sens, comme en « lévitation » à une fraction de millimètre au-dessus de la plaque métallique.
A Leidenfrost drop made of inflammable liquid exhibits increased evaporation when inflamed. Contrary to the classical Leidenfrost framework, the evaporation from the top part cannot be neglected anymore. Herein, we report the evaporation dynamics of an inflamed drop for various wall temperatures. The combustion duration is found to be significantly longer in the Leidenfrost state than below the Leidenfrost transition.
Abstract The Levitation of a droplet on a hot surface due to the rapid vaporization of the liquid at the proximity of the heat source is known as the Leidenfrost effect. This effect has been demonstrated when the surface is a solid or a liquid. Here, we explore the interaction between a liquid droplet and a hot granular material. The granular material is, by essence, a solid but adopts some behaviors similar to fluids.
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