오일 도포 표면의 결빙방지 성능에 관한 연구

Frost formation and accumulation have widely caused serious performance degradation and economic/safety problems in a variety of industrial and residential applications including aircraft, ships, wind turbines, dams, power transmission liens, heat pumps, refrigerators and air conditioners. Recent studies have reported that oil-infused superhydrophobic (Oil-SHPo) surfaces have excellent anti-icing ability due to its high droplet mobility, but few studies have clearly demonstrated detailed mechanisms of freezing delay on the surfaces. Here, we apply the Oil-SHPo wettability on commercially available Al surfaces and investigate how such wetting property effectively suppresses ice spreading under condensation frosting condition. Observed in a microscope test setup, microscale icing behaviors on the surfaces exhibit that its high droplet mobility makes droplet distribution with small mass diffusion rate between frozen drops and liquid drops, it leads to low ice propagation velocity. In particular, it is shown that infused oil viscosity plays a critical role in condensation growth rate and small viscosity is more desirable for icephobic surfaces. Heat exchangers with the Oil-SHPo wettability exhibit high droplet removal rate thanks to the influence of its extremely low contact angle hysteresis and it leads to the best anti-icing ability when compare to other test surfaces.