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How supercooled superhydrophobic surfaces affect dynamic behaviors of impacting water droplets?

机译：过冷的超疏水表面如何影响撞击水滴的动态行为？

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摘要

Water droplet icing on the supercooled surface is ubiquitous and presents gigantic harmfulness on the power transmission lines, aircraft and outdoor equipment. Therefore, a good understanding of droplet impact and freezing process on the supercooled superhydrophobic surface is crucial. In this paper, aluminium sheet was adopted as the substrate to prepare the superhydrophobic (SH) surface. A high-speed camera was applied to explore the dynamic behaviors of a water droplet impacting on the SH surface with various supercooling degrees visually. Moreover, the droplet spreading factor, dimensionless height, characteristics time, rebounding energy and mass fraction of the secondary droplets were adopted to reflect the dynamic behaviors. The results indicate that the dynamic behaviors of a droplet (with an initial temperature of 15 degrees C, equivalent diameter of 2.94 mm and impacting velocity of 0.99 m.s(-1)) impacting on the SH surface (160 degrees in static contact angle) with a lower supercooling degree is consisted of three regimes: spreading, retraction and rebounding. Whereas, the retraction and rebounding regime are limited at -17 degrees C and -24 degrees C, respectively. Moreover, in the retraction regime, the governing factor of the droplet frozen onset time transforms from the interface heat transfer ability into incubation time at the surface temperature below -34.4 degrees C. Furthermore, the droplet separating and rebounding are prevented once the remaining energy at the end of the retraction regime is lower than 35% of the droplet initial energy. (C) 2018 Elsevier Ltd. All rights reserved.
机译：过冷表面上的水滴结冰无处不在，并且对输电线路，飞机和室外设备造成巨大危害。因此，充分了解液滴在过冷的超疏水表面上的撞击和冻结过程至关重要。本文以铝片为基材制备超疏水（SH）表面。高速相机被应用于视觉上观察水滴以各种过冷度撞击SH表面的动力学行为。此外，采用液滴的扩散因子，无量纲高度，特征时间，回弹能量和次级液滴的质量分数来反映动力学行为。结果表明，液滴（初始温度为15摄氏度，当量直径为2.94毫米，撞击速度为0.99毫秒（-1））在SH表面（静态接触角为160度）上的动态行为与较低的过冷度由三种状态组成：扩展，收缩和回弹。而收缩和回弹机制分别限制在-17摄氏度和-24摄氏度。此外，在回缩状态下，液滴在表面温度低于-34.4摄氏度时，冻结开始时间的控制因素从界面传热能力转变为保温时间。此外，一旦在回缩过程的结束低于液滴初始能量的35％。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第9期|1025-1032|共8页
  • 作者

    Ding Bin; Wang Hong; Zhu Xun; Chen Rong; Liao Qiang;

  • 作者单位

    Chongqing Univ, Inst Engn Thermophys, Chongqing 400030, Peoples R China;

    Chongqing Univ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400030, Peoples R China;

    Chongqing Univ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400030, Peoples R China;

    Chongqing Univ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400030, Peoples R China;

    Chongqing Univ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400030, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dynamic behaviors; Impact; Superhydrophobic; Supercooled; Water droplet;

    机译：动态行为;影响;超疏水;过冷;水滴;

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