Study on the Anti-Frosting and Droplet Contact Characteristics of Fluorine-Based Self-Assembled Superhydrophobic Coating
In order to study the effect of the cold surface on the anti-frosting performance of the superhydrophobic coating and the impact con-tact behavior of droplets,a fluorine-based self-assembled superhydrophobic coating was sprayed on the surface of carbon fibers.Subsequently,the frosting,droplet icing and droplet contact behaviors of the sample on a semiconductor refrigeration table were observed visually,and the variation mechanisms of frost formation,droplet icing and droplet impact contact behaviors over time on the surface of superhydrophobic coat-ings were analyzed.Results showed that unlike ordinary surfaces,condensation droplets on superhydrophobic surfaces did not freeze at-5 ℃.At temperatures of-10,-15 ℃,the frost suppression effect of superhydrophobic surfaces was significantly better than that of ordinary sur-faces,with frost formation times delayed by 34 s and 22 s,respectively.Besides,the delayed freezing times of droplets on superhydrophobic surfaces at-5,-10,-15 ℃ were 16 times,10 times and 9 times longer than those on ordinary surfaces,respectively.The maximum sprea-ding diameter of droplets after colliding with low-temperature superhydrophobic surfaces was the same at different temperatures.The droplet partially rebounded at-5 ℃ and-10 ℃,and rebounded 11 times on the superhydrophobic surface at 25 ℃.
万方数据
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