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首页> 外文期刊>International Journal of Heat and Mass Transfer >Reduction in the contact time of impacting droplets by decorating a rectangular ridge on superhydrophobic surfaces
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Reduction in the contact time of impacting droplets by decorating a rectangular ridge on superhydrophobic surfaces

机译：通过在超疏水表面上装饰一个矩形脊，减少撞击液滴的接触时间

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摘要

Increasing attentions have been paid to the reduction in contact time between rebounding droplets and solid surfaces because of its potential applications in self-cleaning, anti-icing, anti-dew, and so forth. Owing to the axisymmetric spreading/retraction dynamics of impacting droplets on flat surfaces, there is a minimum contact time. Recently, adding a cylindrical wire or a triangular ridge on superhydrophobic surfaces has been proven to be an effective approach to break through this limit. Here, via lattice Boltzmann simulations, we show that droplets impacting superhydrophobic surfaces decorated with a macro rectangular ridge can also yield a significantly reduced contact time. Based on the simulated snapshots of impact dynamics, we reveal that the presence of the rectangular ridge can induce a tunable nonaxisymmetric spreading/retraction dynamics. We found that once an impacting droplet is split into two fragments by the ridge, the contact time will be lower than the limit achieved on the flat surfaces with the same contact angle. We observe three different retraction ways for the split fragments depending on impact Weber number (We) as well as ridge height and width. When the formed fragments only retract once before they rebound from the surface, a lower contact time can be achieved. However, if they retract twice or re-coalesce after retracting once, the contact time will increase. We demonstrate that a maximum 48% reduction in contact time can be reached on the ridged surface at We = 29.6. (C) 2018 Elsevier Ltd. All rights reserved.
机译：由于回弹液滴与固体表面之间的接触时间的减少在自动清洁，防冰，防露等方面的潜在应用，因此越来越引起人们的关注。由于冲击液滴在平面上的轴对称扩展/收缩动力学，因此接触时间最短。近来，业已证明，在超疏水表面上增加圆柱线或三角形脊线是突破此限制的有效方法。在这里，通过格子Boltzmann模拟，我们表明，液滴撞击装饰有宏观矩形山脊的超疏水表面也可以显着减少接触时间。基于冲击动力学的模拟快照，我们揭示了矩形脊的存在可以诱发可调谐的非轴对称扩展/收缩动力学。我们发现，一旦撞击的液滴被凸脊分割为两个碎片，接触时间将低于在具有相同接触角的平面上达到的极限。根据冲击韦伯数（We）以及山脊的高度和宽度，我们观察到了三种不同的裂片收缩方式。当所形成的碎片在从表面反弹之前仅缩回一次时，可以获得较短的接触时间。但是，如果它们缩回两次或缩回一次后重新凝聚，则接触时间会增加。我们证明，在We = 29.6时，在脊形表面上可以最多减少48％的接触时间。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2019年第4期|1105-1115|共11页
  • 作者

    Lin Dian-Ji; Wang Liang; Wang Xiao-Dong; Yan Wei-Mon;

  • 作者单位

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China|North China Elect Power Univ, Res Ctr Engn Thermophys, Beijing 102206, Peoples R China|North China Elect Power Univ, Key Lab Condit Monitoring & Control Power Plant E, Minist Educ, Beijing 102206, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China|North China Elect Power Univ, Res Ctr Engn Thermophys, Beijing 102206, Peoples R China|North China Elect Power Univ, Key Lab Condit Monitoring & Control Power Plant E, Minist Educ, Beijing 102206, Peoples R China;

    North China Elect Power Univ, State Key Lab Alternate Elect Power Syst Renewabl, Beijing 102206, Peoples R China|North China Elect Power Univ, Res Ctr Engn Thermophys, Beijing 102206, Peoples R China|North China Elect Power Univ, Key Lab Condit Monitoring & Control Power Plant E, Minist Educ, Beijing 102206, Peoples R China;

    Natl Taipei Univ Technol, Dept Energy & Refrigerating Air Conditioning Engn, Taipei 10608, Taiwan;

  • 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

    Droplet impact; Ridge; Superhydrophobic surface; Contact time; Lattice Boltzmann method;

    机译：液滴冲击;脊;超疏水表面;接触时间;格子玻尔兹曼法;

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