A New Surface Coating for Prevention of Icing on Airfoils

Yamagishi, Yoich; Sakabe, Atsuhiko; Adachi, Takafumi; Shimanuki, Masakazu

doi:10.4271/2007-01-3315

Cited by 27 publications

(22 citation statements)

References 2 publications

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“…As per the manufacturer, the coating was primarily developed for aircraft icing prevention. More detailed information on the preparation and performance of this coating is given in Kimura et al 25 Surface 2 is a nearly superhydrophobic surface consisting of a closely packed TiO 2 nanotube array. It was developed using an anodizing process on titanium alloy Ti 6 Al 4 V (50 mm × 50 mm × 1 mm) as substrate.…”

Section: Methodsmentioning

confidence: 99%

Mechanism of supercooled droplet freezing on surfaces

Jung

Tiwari

Doan³

et al. 2012

Nat Commun

592

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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Section: Methodsmentioning

confidence: 99%

Mechanism of supercooled droplet freezing on surfaces

Jung

Tiwari

Doan³

et al. 2012

Nat Commun

592

391

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“…The employed testing methodology is a modification of the ice adhesion by double lap shear test (DLST) used by CRREL [77], adapted to evaluate ice adhesion for aircraft anti-icing solutions. To this end, modifications such as temperature range, loading rate and the geometry of the moldsm where implemented.…”

Section: Ice Adhesionmentioning

confidence: 99%

Hard Quasicrystalline Coatings Deposited by HVOF Thermal Spray to Reduce Ice Accretion in Aero-Structures Components

et al. 2020

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Weather hazards, in particular icing conditions, are an important contributing factor in aviation accidents and incidents worldwide. Many different anti-icing strategies are currently being explored to find suitable long-lasting solutions, such as surface engineering, which can contribute to reduce ice accumulation. Quasicrystals (QCs) are metallic materials, but with similar properties to those of ceramic materials, such as low thermal and electrical conductivities, and high hardness. In particular, QCs that have low surface energy are commercially used as coatings to replace polytetrafluoroethylene (PTFE), also known as Teflon, on frying pans, as they do not scratch easily. PTFE exhibits excellent anti-wetting and anti-icing properties and therefore QCs appear as good candidates to be employed as ice-phobic coatings. Al-based QCs have been applied by High Velocity Oxyfuel (HVOF) thermal spray on typically used aeronautic materials, such as Ti and Al alloys, as well as steels. The coatings have been characterized and evaluated, including the measurement of hardness, roughness, wetting properties, ice accretion behavior in an icing wind tunnel (IWT), and ice adhesion by a double lap shear test. The coatings were studied, both as-deposited, as well as after grinding, in order to study the effect of the surface roughness and morphology on the ice accretion and adhesion properties. The QC coating was compared with PTFE and two polyurethane (PU)-based commercial paints, one of them known to have anti-icing properties, and the results indicate an ice accretion reduction relative to these two materials, and ice adhesion lower than bare AA6061-T6, or the PU paint in the ground version of one of the two QCs. Since the QC coatings are hard (GPa Vickers hardness > 5), a durable behavior is expected.

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“…These characters help the object surface clean. Kimura et al reported the development of a superhydrophobic coating for airfoil icing prevention [3]. Fortine et al also tested a hybrid ice-protection system combined with a thermoelectric anti-icing system and a superhydrophobic coating.…”

Section: Introductionmentioning

confidence: 98%

“…As an approach to the demand for saving energy consumption on wing ice-protection system, a newly iceprotection system, combined heating with superhydrophobic coating, has been proposed [3]. Lotus effect is well known example of superhydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of a Single Droplet on a Superhydrophobic Coating in Icing Wind Tunnel for the Development of Ice-Protection System

Hasegawa

Hyugaji

Yamagishi

et al. 2014

6th AIAA Atmospheric and Space Environments Conference

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Advanced de-and anti-icing method using a combination of heating and superhydrophobic coating has been proposed as an approach to the demand for saving energy consumption on wing ice-protection system. To understand the relationship between shedding droplet and airflow speed as one of the removal process of water sticking on the superhydrophobic coating surface, we measured shedding droplet size on a flat plate sprayed with a superhydrophobic coating exposed to the airflow up to 60 m/s. Our proposed model describing the shedding droplet also estimated the droplet size in airflow of over 60 m/s. It was found that a shedding droplet diameter decreased as the airflow speed increased. It tells us that a small droplet remaining on surface needs a higher speed to remove. For an efficient ice prevention, we suggest that it would be better to have a droplet growth providing enough droplet size to be removed from the surface.

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A New Surface Coating for Prevention of Icing on Airfoils

Cited by 27 publications

References 2 publications

Mechanism of supercooled droplet freezing on surfaces

Mechanism of supercooled droplet freezing on surfaces

Hard Quasicrystalline Coatings Deposited by HVOF Thermal Spray to Reduce Ice Accretion in Aero-Structures Components

Experimental Investigation of a Single Droplet on a Superhydrophobic Coating in Icing Wind Tunnel for the Development of Ice-Protection System

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