Papers by Keyword: Anti-Icing

Abstract: Icing, the phenomenon of the formation and accumulation of ice or frost on a surface due to the solidification of water droplets at low temperature can be undesirable in many applications. Surface icing can lead to increased energy consumption in aerospace and automotive applications due to increased aerodynamic drag. Ice formation can also present a mechanical and electrical safety hazard, and as such significant work has been done to produce surfaces with anti-icing properties through surface modification to decrease ice formation and adhesion to surfaces. One route toward the generation of anti-icing surfaces is through laser surface processing. Laser micro/nanostructuring of surfaces has advanced greatly in recent years due to advancements in laser source technology and reduction in capital costs for ultrafast femtosecond pulsed machining lasers. Laser material processing offers a rapid, scalable, and non-contact method for fabricating large area anti-icing surfaces. In this work, the production of anti-icing surfaces using femtosecond laser micro-and nanostructuring on aluminum alloy 7075 surfaces was examined. With an aim to optimize the anti-icing properties of the substrates, laser parameters such as pulse energy, repetition rate and beam scanning speed were varied to produce highly defined microstructures on the aluminum surface.Various functional properties such as hydrophobicity and surface roughness are examined.

Abstract: The super-hydrophobic coating with self-cleaning property was prepared by particle-filling method based on nanometer SiO₂ (n-SiO₂) and TiO₂ (n-TiO₂) as filler. The surface properties of the coating were tested by contact angle (CA) goniometer and atomic force microscopy (AFM). The results indicate that the contact angle (CA) of the coating is above 160°. The surface of the coating possesses a natural lotus-like micro-and nanohierarchical structure. The CA is recovered gradually from 85° to 138° with procedure the photocatalytic degradation of the oil pollutant for 7 hours. The adhesive force between the coating and icing decreases about 80% compared with that of bare glass surface and icing.

Abstract: A new rectangular anti-icing structure with short pin fins is presented in this paper. Detailed experimental research is applied to discussing its heat transfer and enhancement characteristics. The results show that, heat transfer of this anti-icing structure enhances obviously, and the core factor for enhancement is the volume ratio occupied by pin fins in rectangular channel of anti-icing structure.

Abstract: In this work, a method to eliminate ice on wind turbine blade by using carbon fiber composites was put forward. To prove that this idea is feasible, a carbon fiber composite panel with its ends soaked by the conductive silver paste was fabricated and surface temperature of it at three levels of voltages was measured. The surface temperature of the composite panel increased significantly and finally retained a constant, which shows that the carbon fiber composites can be used to eliminate ice when the glass fabric composite blades are covered by the carbon fiber composites.

Abstract: In this paper, we prepared an octadecyltrichlorosilane(OTS) super-hydrophobic film using phase separation method to demonstrate the anti-icing property of super-hydrophobic surfaces. We investigated the super-hydrophobicity of the surface in -5°C environment, as well as the icing process of water droplets on the surface which proceeded at the temperature low to -15°C. We found that the prepared OTS film retained its super-hydrophobicity in the -5°C environment by the measurement of contact angle. It was observed that the icing progress of water droplets on the super-hydrophobic surface was greatly retarded. Based on the classical heterogeneous nucleation theory, it concluded that the ice formation is directly related to the surface wettability. This research would be beneficial to the preparation of anti-icing films.

Abstract: Because of the problems caused by icing and snow, it is meaningful to develop coatings for anti-icing. In this paper, a superhydrophobic coating was successfully prepared by compounding fluorine-containing acrylate polymer, polysiloxane and nano-SiO₂. Results of Fourier transform infrared spectroscopy (FT-IR) showed that epoxy groups in fluorine-containing acrylate polymer were partially cross-linked with silanol groups in polysiloxane, while self-crosslinking of silanols dominates the curing reaction. It was proven that there was a positive correlation between water contact angle (WCA) and nano-SiO₂ amount, exhibiting a maximum WCA value of 153.6°. Nevertheless, the superhydrophobic coating is subject to collapse and the nano-particles could be scrubbed away during icing. As a result, the superhydrophobicity had trivial contribution to deicing in this experiment.

Abstract: In this work, the anti-icing properties of different poly (vinyl chloride) coatings with different wettabilities were investigated in a climatic chamber with a working temperature of −10 °C. Compared with smooth poly (vinyl chloride) coating, the superhydrophobic poly (vinyl chloride) coating with high sliding angle did not show obvious anti-icing property. However, the superhydrophobic poly (vinyl chloride) coating with low sliding angle can largely prevent ice formation on the surface, showing excellent anti-icing property.

Abstract: A porous superhydrophobic magnesium oxide coating with low sliding angle was prepared by a facile method. The water contact angle and sliding angle of the porous superhydrophobic magnesium oxide coating were 155±1.9º and 1.5º, respectively. The anti-icing property of the porous superhydrophobic magnesium oxide coating with low sliding angle was investigated in a climatic chamber with a working temperature of −6 °C. The results showed that the porous superhydrophobic magnesium oxide coating with low sliding angle can largely prevent ice formation on the surface, showing excellent anti-icing property. The porous superhydrophobic magnesium oxide coating with good anti-icing property will be perfectly desirable for outdoor equipments to reduce ice formation on their surfaces in cold seasons. This work will provide a new way to fabricate anti-icing coating and thus find applications in a variety of fields.

Abstract: The article aims to analyze kinds of de-icing methods in detail with the present condition that the transmission lines often suffered serious damage with the deep ice over them. It also points out the development trend of de-icing technology in the next years and provides some advices for the de-icing research work of transmission line in our country.

Abstract: Nano calcium carbonate/polymer composite coatings were prepared and their anti-icing property was investigated. The anti-icing capability of the composites depends not only on their superhydrophobicity but also on the surface morphology. The result opens up possibilities for rational design of anti-icing coatings by tuning surface textures in multiple scales and provides a comprehensive framework for optimazing nanoparticle/polymer composite for a wide range of applications.