Construction of Multiphase Mixing Interface for Delay Icing Based on Microarray Surface

Abstract

Slippery liquid‐infused porous surface (SLIPS) is an emerging anti‐icing method. The anti‐icing mechanism of SLIPS is to prevent the heat transfer from liquid droplets to the surface by forming an oil film on the solid surface. However, the contact area between the droplet and the surface of the specimen increases due to the existence of the oil film, which accelerates the heat transfer and emergence of ice. Herein, in order to further improve the anti‐icing performance of SLIPS, a microscale square column array is fabricated by wire cut electrical discharge machining (WEDM) technology, on which a circular hole structure is constructed by nanosecond laser. Lubricating oil is then injected into the fluorinated surface to produce SLIPS. The maximum contact angle (CA) of the surface is 150° ± 1.2° and the contact angle hysteresis (CHA) is 1.2°. The contact mode of droplets on the surface is liquid–oil and liquid–gas, which is a multiphase mixing interface. The icing test shows that the icing time of the droplet is 4785 s at a surface temperature of −10 °C, exhibiting a good icing‐delay performance.