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Photothermal trap utilizing solar illumination for ice mitigation

Dash, Susmita and de Ruiter, Jolet and Varanasi, Kripa K (2018) Photothermal trap utilizing solar illumination for ice mitigation. In: SCIENCE ADVANCES, 4 (8).

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Official URL: http://dx.doi.org/10.1126/sciadv.aat0127

Abstract

Ice buildup is an operational and safety hazard in wind turbines, power lines, and airplanes. Traditional deicing methods, including mechanical and chemical means, are energy-intensive or environmentally unfriendly. Super hydrophobic anti-icing surfaces, while promising, can become ineffective due to frost formation within textures. We report on a ``photothermal trap'' a laminate applied to a base substrate that can efficiently deice by converting solar illumination to heat at the ice-substrate interface. It relies on the complementing properties of three layers: a selective absorber for solar radiation, a thermal spreader for lateral dispersal of heat, and insulation to minimize transverse heat loss. Upon illumination, thermal confinement at the heat spreader leads to rapid increase of the surface temperature, thereby forming a thin lubricating melt layer that facilitates ice removal. Lateral heat spreading overcomes the unavoidable shadowing of certain areas from direct illumination. We provide a design map that captures the key physics guiding illumination-induced ice removal. We demonstrate the deicing performance of the photothermal trap at very low temperatures, and under frost and snow coverage, via laboratory-scale and outdoor experiments.

Item Type: Journal Article
Additional Information: Copy right for this article belong to AMER ASSOC ADVANCEMENT SCIENCE, 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 25 Sep 2018 17:31
Last Modified: 25 Sep 2018 17:31
URI: http://eprints.iisc.ac.in/id/eprint/60711

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