当前位置: X-MOL 学术Surf. Coat. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
In situ ice growth kinetics on water-repellent coatings under atmospheric icing conditions
Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.surfcoat.2020.126136
Jacques Lengaigne , Etienne Bousser , Stephen Brown , Paul Xing , Francis Turcot , Ali Dolatabadi , Ludvik Martinu , Jolanta E. Klemberg-Sapieha

Superhydrophobic surfaces represent a promising avenue to mitigate icing on aircraft from micrometric Supercooled Water Droplets (SWD). In the present work, we developed a novel laser-based in situ ice growth monitoring system to investigate, under realistic icing conditions, the role of wettability on the ice growth kinetics and the icephobic performance of water-repellent coatings during SWD ice accretion. This approach records the laser beam displacement and spreading, allowing one to measure ice thickness as well as assess ice microstructural changes in real time during the ice growth. Three surfaces were studied: hydrophilic Ti-6Al-4V alloy, hydrophobic spray coating, and superhydrophobic spray coating. The ice grows instantaneously on the hydrophilic and hydrophobic surfaces as pinned droplets freeze, and ice quickly covers the surface with a continuous layer. On the superhydrophobic sample, droplets bounce before freezing delaying ice nucleation by 26 ± 5 s. In this case, the island-mode growth is driven by hydrophilic droplet-pinning defects in the coating. When ice has formed a continuous layer the growth rate is linear and it increases with increasing hydrophobicity, 28% faster on the superhydrophobic surface compared to the hydrophilic substrate. This new approach highlights the role of wettability during ice accretion and will guide the development of new icephobic surfaces for aeronautics.



中文翻译:

大气结冰条件下憎水涂层的原位冰生长动力学

超疏水表面代表减轻微米级过冷水滴(SWD)对飞机结冰的有前途的途径。在目前的工作中,我们开发了一种新颖的基于激光的原位结冰监测系统,研究在实际结冰条件下,在SWD结冰过程中,润湿性对结冰动力学和憎水涂层的憎冰性能的作用。这种方法记录了激光束的位移和散布,从而可以测量冰的厚度以及在冰生长过程中实时评估冰的微观结构变化。研究了三个表面:亲水性Ti-6Al-4V合金,疏水性喷涂层和超疏水性喷涂层。当固定的小滴冻结时,冰在亲水性和疏水性表面上瞬间生长,并且冰迅速以连续层覆盖表面。在超疏水性样品上,液滴在冻结前会反弹,从而使冰核延迟26±5 s。在这种情况下,岛状生长是由涂层中的亲水性液滴钉扎缺陷驱动的。当冰形成连续层时,其生长速度是线性的,并且随着疏水性的增加而增加,与疏水性基材相比,超疏水性表面的生长速度快28%。这种新方法突出了可湿性在积冰过程中的作用,并将指导航空业新的憎冰表面的开发。

更新日期:2020-06-30
down
wechat
bug