Understanding the effect of superhydrophobic coatings on energy reduction in anti-icing systems
Understanding the effect of superhydrophobic coatings on energy reduction in anti-icing systems
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DOI：
10.1016/j.coldregions.2011.02.006
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发表时间：
2011-06-01
影响因子：
4.1
通讯作者：
Amirfazli, A.
中科院分区：
文献类型：
--
作者：
Antonini, C.;Innocenti, M.;Amirfazli, A.
迄今为止，在航空、风力涡轮机或电信天线的防/除冰系统的开发中，对涂层策略的关注较少。大多数关于涂层的研究主要集中在减少冰的粘附力，以便在冰形成后容易地去除冰。在这项研究中，我们专注于一种替代策略，该策略包括促进液态水的脱落，以减少表面上存在的可以冻结的水的总量。液体从表面的脱落可以通过表面润湿性的改性来增强，通过应用超疏水涂层，即防水涂层，其特征在于低水adhesionforces.To研究超疏水涂层对暴露于结冰条件下的表面的影响，在开环结冰风洞（IWT）中对标准NACA 0021翼型在两种不同的结冰条件下进行测试。在测试过程中使用了三个样品，每个样品的特征在于不同的润湿性。为了模拟防/除冰系统的存在，机翼还配备了一个电加热器，安装在机翼前缘的内侧。IWT试验的结果表明，表面润湿性不仅是减少机翼积冰的重要控制因素，而且可以减少高达80%的避免机翼积冰所需的能量。所描述的IWT试验的结果，以及先前关于液滴脱落的工作的结果，加强了液滴脱落是有效的结冰缓解策略的关键控制机制的假设。(C)2011 Elsevier B. V.保留所有权利。
In the development of anti/de-icing systems for aeronautics, wind turbines or telecommunication antennas to date, less attention is paid to coating strategies. The majority of studies dealing with coatings have focused mainly on reducing ice adhesion forces, to easily remove ice, once it has formed. In this study we focused on an alternative strategy that consists of promoting the shedding of liquid water as a way to reduce the total amount of water present on the surface that can freeze. Shedding of liquid from the surface can be enhanced by modification of surface wettability, by means of the application of superhydrophobic coatings, i.e. water repellent coatings, characterized by low water adhesion forces.To study the effect of superhydrophobic coatings on surfaces exposed to icing conditions, tests were performed in an open loop icing wind tunnel (IWT) on a standard NACA0021 airfoil in two different icing conditions. Three samples were used during the tests, each one is characterized by different wettability properties. To simulate the presence on anti/de-icing system, the wing was also equipped with an electrical heater, mounted at the inner side of the wing leading edge.Results from IWT tests demonstrated that surface wettability is an important controlling factor not only for reducing ice accretion on the wing, but also for reducing by up to 80% the energy required to avoid ice accretion on the wing. The findings from IWT tests as described, together with results from a previous work on drop shedding, reinforced the hypothesis that shedding of drops is the key controlling mechanism for an efficient icing mitigation strategy. (C) 2011 Elsevier B.V. All rights reserved.