雷登弗罗斯特效应
悬浮
材料科学
等温过程
润湿
蓝宝石
机械
热力学
传热
光学
复合材料
物理
核沸腾
传热系数
激光器
量子力学
磁铁
作者
Minori Shirota,Michiel A. J. van Limbeek,Chao Sun,Andréa Prosperetti,Detlef Lohse
标识
DOI:10.1103/physrevlett.116.064501
摘要
When a liquid droplet impacts a hot solid surface, enough vapor may be generated under it to prevent its contact with the solid. The minimum solid temperature for this so-called Leidenfrost effect to occur is termed the Leidenfrost temperature, or the dynamic Leidenfrost temperature when the droplet velocity is non-negligible. We observe the wetting or drying and the levitation dynamics of the droplet impacting on an (isothermal) smooth sapphire surface using high-speed total internal reflection imaging, which enables us to observe the droplet base up to about 100 nm above the substrate surface. By this method we are able to reveal the processes responsible for the transitional regime between the fully wetting and the fully levitated droplet as the solid temperature increases, thus shedding light on the characteristic time and length scales setting the dynamic Leidenfrost temperature for droplet impact on an isothermal substrate.
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