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Impacts de gouttes en caléfaction sur substrat localement texturés

Abstract : The presented work deals with drop impacts in Leidenfrost regime. In such a case, the drop is thermally and mechanically isolated from the overheated substrate by a thin vapor layer. Viscous friction can therefore be neglected. The substrates are shaped with localized micrometric textures. We rediscover a self-similar spreading regime at short times. We characterize covering regimes of a single defect by the drop. Those regimes are driven by the ratio between lamella thickness and defect thickness. Defects give rise to excrescences in their wake, whose dynamic can be approached by two inertial-capillary recoil models. One is valid at short times and the other at longer times. In the case of several defects, we break up the lamella from different sites according to the ratio between defect width and lamella thickness. We numerically predict, with a tessellation algorithm, the pattern on which the fluid is localized at the end of the fragmentation. Through more complex textures, we can channel the drop spreading. The spreading is increased in the directions of the channels. One can also inhibit the spreading with circular textures. The textures affect the time before drop rebound. We exhibit a general and unique dependency between time before rebound and maximal spreading. This dependency is valid when textures increase the spreading as well as when they inhibit it
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Submitted on : Tuesday, October 2, 2018 - 4:39:05 PM
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  • HAL Id : tel-01886220, version 1

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Quentin Ehlinger. Impacts de gouttes en caléfaction sur substrat localement texturés. Dynamique des Fluides [physics.flu-dyn]. Université de Lyon, 2018. Français. ⟨NNT : 2018LYSE1122⟩. ⟨tel-01886220⟩

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