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In-situ icing and water condensation study on different topographical surfaces

机译：不同地形表面的原位结冰和水凝结研究

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摘要

Icephobicity is intrinsically affected by rough asperities and the surface voids provide anchoring points for the ice. The anchor of ice is likely to form on the surface under high humidity conditions. In-situ water condensation and icing observation were conducted to understand water condensation and ice retracting patterns in controlled humidity, pressure and temperature conditions. It was observed that water micro-condensation and icing occurred on rougher surfaces and the water droplets condensed along the surface cracks of the superhydrophobic polydimethylsiloxane (PDMS) based nanocomposite coatings. Further analysis revealed that ice anchoring was present on both aluminum and superhydrophobic coating surface, but it was more severe and intensified on the as-received aluminum substrates. No water condensation or subsequent icing was found on smooth PDMS hydrophobic surfaces due to the incapacity of the smooth surfaces to anchor water drops. It is the first time to validate ice anchoring over retracting ice on different wettability surfaces from in-situ icing observation. Ice adhesion strengths were also measured on the studied surfaces and the results indicated a strong linkage between centrifugal shearing of ice and anchoring mechanism due to surface rough voids, and there was no clear relevancy between ice adhesion strength and the surface wettability or hydrophobicity.
机译：疏冰本质上受到粗糙凹凸的影响，表面空隙为冰提供了固定点。在高湿度条件下，冰的锚可能会形成在表面上。进行了原位水凝结和结冰观察，以了解在受控的湿度，压力和温度条件下的水凝结和回冰模式。观察到在较粗糙的表面上发生水的微冷凝和结冰，并且水滴沿着超疏水性聚二甲基硅氧烷（PDMS）基纳米复合涂层的表面裂纹冷凝。进一步的分析表明，在铝和超疏水涂层表面均存在冰锚固，但在原样的铝基板上，冰锚固更为严重并加剧。由于光滑表面无法固定水滴，因此在光滑的PDMS疏水表面上未发现水凝结或随后结冰。从现场结冰的观察来看，这是首次验证冰在不同润湿性表面上的回缩冰上的锚固效果。还测量了研究表面的冰粘附强度，结果表明，由于表面粗糙的空隙，冰的离心剪切与锚固机制之间存在很强的联系，并且冰粘附强度与表面的润湿性或疏水性之间没有明显的相关性。

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