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首页> 外文期刊>International Journal of Heat and Mass Transfer >Bouncing behavior of a water droplet on a super-hydrophobic surface near freezing temperatures
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Bouncing behavior of a water droplet on a super-hydrophobic surface near freezing temperatures

机译：在冰冻温度附近的超疏水表面上的水滴的弹跳行为

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摘要

Super-hydrophobic surfaces (SHSs) have demonstrated outstanding capability to mitigate the problem of ice nucleation in various engineering applications. Hence, experiments were conducted to understand the bouncing behavior of a water droplet on SHS under the condition of large temperature difference between the SHS and the impinging water droplet. The SHS was fabricated by spray-coating of a suspension of acetylene black and trimethylsiloxysilicate on a copper substrate. The ice-phobic nature of SHS was evaluated for a wide range of SHS temperature maintained around the freezing point of water (283 K-248 K). In addition, the effects of increasing the droplet temperature and droplet size on the droplet rebounding behavior were also analyzed. To evaluate the dynamics of water droplet during impact, the contact time and rebounding height were measured and employed as performance parameters. The results revealed that either by lowering the SHS temperature (from 283 K to 248 K) or by increasing the droplet temperature (from 278 K to 293 K) or droplet diameter (from D_S = 2.07 mm to D_L = 2.99 mm), an increase in the droplet-SHS contact time or a decrease in rebounding height were observed. Above findings were elucidated by the fact that when an impinging water droplet of relatively higher temperature came into contact with an SHS maintained at much lower temperature, evaporation took place from the droplet and at low temperature of SHS, the empty space inside the micro/nano surface textures of SHS was filled due to the condensation of evaporated water vapor. Thus, water bridges were formed within the micro/nano surface cavities and the wetting transition from the Cassie-Baxter state to the Wenzel state took place and the super-hydrophobicity of the surface could no longer be preserved. To overcome the adhesion between the impinging droplet and water bridges within micro/nano surface cavities, a larger amount of kinetic energy was spent during the droplet rebound. Consequently, for an impinging droplet, a noticeable decrease in the residual energy was observed.
机译：超级疏水表面（SHSS）表现出优异的能力，以减轻各种工程应用中的冰成核问题。因此，进行实验以了解SHS与撞击水滴之间的大温差的条件下SHS上的水滴的弹跳行为。通过在铜基材上喷涂乙炔黑和三甲基硅氧烷硅酸盐的悬浮液来制造SH。评估SHS的冰泛骨质，以围绕水的冷冻点（283 k-248 k）保持各种SHS温度。此外，还分析了增加液滴温度和液滴尺寸对液滴反弹行为的影响。为了评估撞击期间水滴的动态，测量接触时间和反弹高度，并用作性能参数。结果表明，通过将SHS温度降低（从283 k至248 k）或通过增加液滴温度（从278k至293 k）或液滴直径（从d_s = 2.07mm到d_l = 2.99mm），增加在液滴-SHS中，观察到的接触时间或反弹高度的降低。通过以下情况阐明了以下情况，即当相对较高温度的撞击水滴与维持在更低的温度保持在更低的SHS时，蒸发从液滴和SH的低温下发生，微/纳米内的空间由于蒸发水蒸气的冷凝，SHS的表面纹理被填充。因此，在微/纳米表面腔内形成水桥，并发生从Cassie-Baxter状态到温革肠状态的润湿转变，并且可以不再保留表面的超级疏水性。为了克服微/纳米表面腔内的撞击液滴和水桥之间的粘合，在液滴反弹期间花了较大量的动能。因此，对于撞击液滴，观察到残留能量的显着降低。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121304.1-121304.14|共14页
  • 作者

    Heng Wang; Qian Wu; Jun Okagaki; Amer Alizadeh; Jubair A. Shamim; Wei-Lun Hsu; Hirofumi Daiguji;

  • 作者单位

    Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

  • 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

    Super-hydrophobic surface; Droplet rebound; Evaporation and condensation; Wetting transition; Adhesion loss;

    机译：超级疏水表面;液滴反弹;蒸发和凝结;润湿过渡;粘附损失;

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