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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of wettability on explosive boiling of nanoscale liquid films: Whether the classical nucleation theory fails or not?
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Effects of wettability on explosive boiling of nanoscale liquid films: Whether the classical nucleation theory fails or not?

机译：润湿性对纳米级液膜爆炸沸腾的影响：经典的成核理论是否失败？

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摘要

Two main reasons including practical and scientific significance continuously motivate the studies of explosive boiling of nanoscale liquid films. Whether the nanoscale explosive boiling agrees with classical nucleation theory is still an open issue. In this work, we study the effects of surface wettability on the explosive boiling of nanoscale liquid films using molecular dynamics simulations. A critical film thickness is proposed to address the debate of whether the classical nucleation theory fails in nanoscale boiling. The explosive boiling modes and dynamics are summarized with the phase diagram based on various simulation cases, considering the effects of surface wettability, film thickness, and surface superheat. When the films thickness exceeds the critical thickness, hydrophobic surfaces are more favorable for explosive boiling, which still agrees with the classical nucleation theory. However, a much higher superheat is required to trigger the explosive boiling of a thin liquid film when its thickness is less than the critical thickness on hydrophobic surfaces, which consists with previous molecular dynamics simulations. Furthermore, we also find that the explosive boiling is trigged faster for films on hydrophilic surfaces than those on hydrophobic surfaces with the same superheat owing to the lower Kapitza thermal resistance. With such heat transfer superiority, hydrophilic surfaces can heat liquid films faster to explosion. The deliveries of this work and the concept of the critical thickness might help to understand the still fledgling field of nanoscale boiling phase change and its relevant mechanisms. (C) 2018 Elsevier Ltd. All rights reserved.
机译：包括实践意义和科学意义的两个主要原因不断地推动着纳米级液膜爆炸沸腾的研究。纳米级炸药的沸腾是否与经典的成核理论相吻合仍然是一个悬而未决的问题。在这项工作中，我们使用分子动力学模拟研究了表面润湿性对纳米级液膜爆炸沸腾的影响。为了解决关于经典成核理论是否在纳米级沸腾中失败的争论，提出了临界膜厚度。考虑到表面润湿性，膜厚和表面过热的影响，在各种模拟情况下，通过相图总结了爆炸沸腾的模式和动力学。当膜厚度超过临界厚度时，疏水表面更适合爆炸沸腾，这仍然与经典的成核理论相吻合。但是，当薄膜的厚度小于疏水性表面的临界厚度时，需要更高的过热度来引发薄膜的爆炸沸腾，这与以前的分子动力学模拟是一样的。此外，我们还发现，由于Kapitza的耐热性较低，在具有相同过热度的亲水性表面上的薄膜比在疏水性表面上的薄膜更容易触发爆炸沸腾。凭借这种传热优势，亲水性表面可以更快地加热液膜使其爆炸。这项工作的交付和临界厚度的概念可能有助于了解仍处于起步阶段的纳米级沸腾相变及其相关机理。 （C）2018 Elsevier Ltd.保留所有权利。

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