Leidenfrost Self-Rewetting Drops,The Journal of Physical Chemistry B

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Leidenfrost Self-Rewetting Drops
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2018-04-19 00:00:00 , DOI: 10.1021/acs.jpcb.7b11944
Safouene Ouenzerfi ₁ , Souad Harmand ₁ , Jesse Schiffler ₁

Affiliation

As discovered by Leidenfrost, liquids placed on very hot solids levitate on a cushion of their own vapor. This is also called the calefaction phenomenon, a dynamical and transient effect, as vapor is injected below the liquid and pressed by the drop weight. To account for the film vapor, we consider the surface tension magnitude as well as the Marangoni effect (in particular the thermal one) which arise with imbalance of surface tension forces. For standard liquids, these forces contribute to amplify the thickness of the film layer and the levitation of the droplet. Our findings imply the ability of recent binary mixture liquids, called self-rewetting fluids, to reduce the vapor film thickness and demonstrate the powerful influence exerted by different binary mixtures to enhance the heat transfer at high temperature. Such self-rewetting fluids are presenting a high value of surface tension at high temperature, and in which the Marangoni forces are inversed as from critical temperature. We consider our assay to be a way for improvement in the high temperature mass cooling applications.

中文翻译：

莱顿弗罗斯特自润湿滴剂

正如莱顿弗罗斯特（Leidenfrost）所发现的那样，放在非常热的固体上的液体会悬浮在自身蒸气的垫层上。这也称为校准现象，是一种动态和短暂的影响，因为蒸气被注入到液体下方并受到液滴重量的挤压。为了说明薄膜蒸气，我们考虑了表面张力的大小以及由于表面张力不平衡而产生的马兰戈尼效应（特别是热效应）。对于标准液体，这些力有助于放大薄膜层的厚度和液滴的悬浮。我们的发现暗示了近来的二元混合液体（称为自粘性液体）能够减小蒸气膜厚度，并证明不同二元混合物对高温下的传热具有强大的影响。这种自润湿液体在高温下呈现出高的表面张力值，并且其中的马兰戈尼力从临界温度起反演。我们认为我们的测定方法是改进高温大体积冷却应用的一种方法。

更新日期：2018-04-19

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