Heat Transfer Analysis of Icing Process on Metallic Surfaces of Different Wettabilities

Abstract

Superhydrophobic surfaces are promising in delaying ice formation and reducing ice accumulation, which can promote the safety and integrity of structures and human safety in harsh environments. This paper investigates heat transfer during the icing process on stainless steel surfaces of different wettabilities. The results demonstrate that a poorer wetting condition, i.e., (super)hydrophobic surfaces, or a smaller impact velocity leads to a smaller final contact area Ac between a water droplet and the cold surface. Also, the average cooling rate q is proportional to the final contact area Ac. Therefore, surface wettability can affect the changes on final contact area of water droplet, and the average cooling rate is influenced by the final contact area. In another word, the water droplet icing process can be delayed when it impacts on hydrophobic or superhydrophobic surfaces.