Leidenfrost Effect as a Directed Percolation Phase Transition,Physical Review Letters

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Leidenfrost Effect as a Directed Percolation Phase Transition
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-09-17 , DOI: 10.1103/physrevlett.127.124502
Pierre Chantelot ₁ , Detlef Lohse _{1,

2}

Affiliation

Volatile drops deposited on a hot solid can levitate on a cushion of their own vapor, without contacting the surface. We propose to understand the onset of this so-called Leidenfrost effect through an analogy to nonequilibrium systems exhibiting a directed percolation phase transition. When performing impacts on superheated solids, we observe a regime of spatiotemporal intermittency in which localized wet patches coexist with dry regions on the substrate. We report a critical surface temperature, which marks the upper bound of a large range of temperatures in which levitation and contact coexist. In this range, with decreasing temperature, the equilibrium wet fraction increases continuously from zero to one. Also, the statistical properties of the spatiotemporally intermittent regime are in agreement with that of the directed percolation universality class. This analogy allows us to redefine the Leidenfrost temperature and shed light on the physical mechanisms governing the transition to the Leidenfrost state.

中文翻译：

作为定向渗透相变的莱顿弗罗斯特效应

沉积在热固体上的挥发性液滴可以悬浮在它们自己的蒸气垫上，而不会接触表面。我们建议通过与表现出定向渗透相变的非平衡系统的类比来理解这种所谓的莱顿弗罗斯特效应的开始。在对过热固体进行冲击时，我们观察到一种时空间歇性机制，其中局部湿斑与基材上的干燥区域共存。我们报告了一个临界表面温度，它标志着悬浮和接触共存的大范围温度的上限。在这个范围内，随着温度的降低，平衡湿分数从零到一连续增加。还，时空间歇机制的统计特性与定向渗透普遍性类的统计特性一致。这个类比使我们能够重新定义莱顿弗罗斯特温度，并阐明控制向莱顿弗罗斯特状态转变的物理机制。

更新日期：2021-09-17

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