An experimental study of rain erosion effects on a hydro-/ice-phobic coating pertinent to Unmanned-Arial-System (UAS) inflight icing mitigation

结冰 润湿 涂层 腐蚀 环境科学 接触角 材料科学 复合材料 气象学 地质学 物理 古生物学
作者
Zichen Zhang,Liqun Ma,Yang Liu,Juan Ren,Hui Hu
出处
期刊:Cold Regions Science and Technology [Elsevier BV]
卷期号:181: 103196-103196 被引量:20
标识
DOI:10.1016/j.coldregions.2020.103196
摘要

Abstract An experimental investigation was conducted to evaluate the variations of the surface wettability and ice adhesion strength on a typical hydro−/ice-phobic surface before and after undergoing continuous impingement of water droplets (i.e., rain erosion effects) at relatively high speeds (i.e., up to ~100 m/s) pertinent to Unmanned-Arial-System (UAS) inflight icing mitigation. The experimental study was conducted by leveraging a specially designed rain erosion testing rig available at Iowa State University. Micro-sized water droplets carried by an air jet flow were injected normally onto a test plate coated with a typical Super-Hydrophobic Surface (SHS) coating to simulate the scenario with micro-sized water droplets in the cloud impacting onto UAS airframe surfaces. During the experiments, the surface wettability (i.e., in the terms of static, advancing and receding contact angles of water droplets) and the ice adhesion strength on the SHS coated test plate were quantified as a function of the duration of the rain erosion testing. The surface topology changes of the SHS coated surface against the duration of the rain erosion testing were also measured by using an Atomic Force Microscope (AFM) system. The characteristics of the surface wettability and ice adhesion strength on the eroded SHS surface are correlated with the AFM measurement results to elucidate the underlying physics for a better understanding about the rain erosion effects on hydro−/ice-phobic coatings in the context of UAS inflight icing mitigation.
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