静水压力
润湿
表面压力
阻力
涂层
聚苯乙烯
纳米技术
复合材料
流变学
流体静力平衡
水下
材料科学
机械
物理
聚合物
地质学
海洋学
量子力学
作者
Mohamed A. Samaha,H. Vahedi Tafreshi,Mohamed Gad‐el‐Hak
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2012-11-01
卷期号:24 (11)
被引量:71
摘要
Prior studies have demonstrated that superhydrophobicity of submerged surfaces is influenced by hydrostatic pressure and other environmental effects. Sustainability of a superhydrophobic surface could be characterized by both how long it maintains the trapped air in its surface pores, so-called “longevity,” and the pressure beyond which it undergoes a global wetting transition, so-called “terminal pressure.” In this work, we investigate the effects of pressure on the performance of electrospun polystyrene fibrous coatings. The time-dependent hydrophobicity of the submerged coating in a pressure vessel is optically measured under elevated pressures. Rheological studies are also performed to determine the effects of pressure on drag reduction and slip length. The measurements indicate that surface longevity exponentially decays with increasing pressure in perfect agreement with the studies reported in the literature at lower pressures. It is found, however, that fibrous coatings could resist hydrostatic pressures significantly higher than those of previously reported surfaces. Our observations indicate that superhydrophobic fibrous coatings could potentially be used for underwater applications.
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