State-of-the-art on power line de-icing

Laforte, Jean-Louis; Allaire, M.A.; Laflamme, Jean

doi:10.1016/s0169-8095(97)00057-4

Cited by 411 publications

(228 citation statements)

References 11 publications

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“…Heavy ice accumulations cause major structural problems that increase the high level of danger for workers. The most common deicing methods are efficient but costly and require human resources [1] and [2]. However, the passive methods, such as icephobic coatings, where ice does not adhere, needs fewer infrastructures and may reduce the amount of energy needed to remove the ice [3] and [4].…”

Section: Introductionmentioning

confidence: 99%

Nano-micro structured superhydrophobic zinc coating on steel for prevention of corrosion and ice adhesion

Brassard

Sarkar

Perron

et al. 2015

Journal of Colloid and Interface Science

131

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Thin films of zinc have been deposited on steel substrates by electrodeposition process and further functionalized with ultra-thin films of commercial silicone rubber, in order to obtain superhydrophobic properties. Morphological feature, by scanning electron microscope (SEM), shows that the electrodeposited zinc films are composed of micronano rough patterns. Furthermore, chemical compositions of these films have been analyzed by X-ray diffraction (XRD) and infra-red (IRRAS). An optimum electrodeposition condition, based on electrical potential and deposition time, has been obtained which provides superhydrophobic properties with a water contact angle of 155 ± 1°. The corrosion resistance properties, in artificial seawater, of the superhydrophobic zinc coated steel are found to be superior to bare steel. Similarly, the measured ice adhesion strength on superhydrophobic surfaces, using the centrifugal adhesion test (CAT), is found to be 6.3 times lower as compared to bare steel. This coating has promising applications in offshore environment, to mitigate corrosion and reduce ice adhesion.Graphical abstract

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Section: Introductionmentioning

confidence: 99%

Nano-micro structured superhydrophobic zinc coating on steel for prevention of corrosion and ice adhesion

Brassard

Sarkar

Perron

et al. 2015

Journal of Colloid and Interface Science

131

View full text Add to dashboard Cite

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“…U nderstanding the icing mechanisms on surfaces 1-3 exposed to different environmental conditions is crucial to a broad range of applications such as power transmission lines and aerodynamic surfaces from aviation to wind turbine industries 4,5 . Ice accumulation on aerodynamic wing structures, for example, can cause hazardous air flow conditions, increasing drag and degrading the controllability of an aeroplane.…”

mentioning

confidence: 99%

Mechanism of supercooled droplet freezing on surfaces

Jung

Tiwari

Doan³

et al. 2012

Nat Commun

617

391

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understanding ice formation from supercooled water on surfaces is a problem of fundamental importance and general utility. superhydrophobic surfaces promise to have remarkable 'icephobicity' and low ice adhesion. Here we show that their icephobicity can be rendered ineffective by simple changes in environmental conditions. Through experiments, nucleation theory and heat transfer physics, we establish that humidity and/or the flow of a surrounding gas can fundamentally switch the ice crystallization mechanism, drastically affecting surface icephobicity. Evaporative cooling of the supercooled liquid can engender ice crystallization by homogeneous nucleation at the droplet-free surface as opposed to the expected heterogeneous nucleation at the substrate. The related interplay between droplet roll-off and rapid crystallization is also studied. overall, we bring a novel perspective to icing and icephobicity, unveiling the strong influence of environmental conditions in addition to the accepted effects of the surface conditions and hydrophobicity.

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“…Les progrès réalisés dans le domaine de la science des matériaux et les nouvelles recherches effectuées sur l'adhérence de glace ont récemment renouvelé l'intérêt envers le développement de matériaux glaciophobes, dont l'utilisation est une méthode passive pour pallier les inconvénients des méthodes actives traditionnelles, comme le dégivrage mécanique et thermique [3][4]. Cependant, afin de développer de tels matériaux, l'évaluation de la force d'adhérence de la glace et la prédiction de sa variation, en fonction des caractéristiques de l'interface entre la glace et différents matériaux, s'avèrent incontournables.…”

Section: Liste Des Tableauxunclassified

Contribution à l'étude des mécanismes de l'adhésion de la glace à différents matériaux et application à l'évaluation des matériaux glaciophobes /

Ghalmi¹

2013

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Several Nordic countries with cold climates like Canada are often subjected to ice storms causing major economic and social losses. Ice or sticky snow adhesion on power network equipment can be a significant issue in transmission and distribution of electrical energy for companies operating in these regions. The costs of such events can be substantial, particularly due to the cessation of economic activities, equipment failures, deicing techniques (active methods), and population safety. Because of such events, power companies have understood the need to develop so-called superhydrophobic and/or icephobic surfaces, which can significantly reduce ice adhesion (passive methods). Several studies have led to the development of a variety of new nanostructured surfaces using various strategies. These studies have led to the design of superhydrophobic surfaces with contact angles greater than 150 and low ice adhesion strength.In order to optimally reduce the ice adhesion strength on different substrates, better understanding of the various mechanisms involved in the icing process is essential. It is in this context and within the framework of Canada's research chair on atmospheric icing of power networks (INGIVRE) that this thesis was carried out, aiming to improve the knowledge of atmospheric icing, and explain the forces involved at the ice/substrate interface. Furthermore, the effect of contact angle, surface roughness and porosity on icing and ice/substrate interface was investigated.This study clearly showed that the electrostatic, van der Waals and hydrogen bond forces are the main contributors to ice adhesion to a surface at the molecular level. The electrostatic energy, based on the principle of image charge, depends on the type of material in contact with the ice, the distance between the ice and the material, and the types of ice surface defects. The van der Waals energy depends on the material type, the thickness of the liquid water layer, and the temperature. For its part, the energy associated with hydrogen bonds depends on the material type, temperature, droplet mass, as well as on IV the static and sliding contact angles. Among these three forces, the electrostatic energy is the largest. Whereas the hydrogen bond energy is larger than the van der Waals energy. However, the latter is always present as long as ice is in contact with a solid surface.The experimental study showed that ice adhesion strength depends on the surface roughness of the substrate. In the case of metals with a thin natural protective oxide layer, higher roughness leads to higher ice adhesion strength. In other words, polished metallic surfaces exhibit lower ice adhesion strengths. However, in the case of anodized aluminum surfaces coated with PTFE, the roughened needle-like structure resulted in lower ice adhesion. The experimental results showed that PTFE coatings remain resistant to icing/deicing cycles. Even after 15 icing/deicing cycles, surfaces remain hydrophobic with a static contact angle greater than 130°. LISTE ...

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State-of-the-art on power line de-icing

Cited by 411 publications

References 11 publications

Nano-micro structured superhydrophobic zinc coating on steel for prevention of corrosion and ice adhesion

Nano-micro structured superhydrophobic zinc coating on steel for prevention of corrosion and ice adhesion

Mechanism of supercooled droplet freezing on surfaces

Contribution à l'étude des mécanismes de l'adhésion de la glace à différents matériaux et application à l'évaluation des matériaux glaciophobes /

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