Research On Anti-icing Performance Of Photothermal Superhydrophobic Surface

Icing is a normal phenomenon in nature,but the icing disaster has brought a serious threat to people’s normal life,and the traditional deicing method has some disadvantages.Therefore,it is very important to explore a new way of frost suppression.In view of the disadvantages of high manufacturing cost and cumbersome manufacturing process of superhydrophobic surface,carbon nanotubes and graphene nanoparticles were introduced into ordinary hydrophobic coatings.The new hydrophobic surface with excellent anti ice and frost suppression performance was prepared.Under the condition of natural convection,the frosting experiments and droplet freezing experiments under different cold surface temperatures and environmental humidity were carried out.The hydrophobic surface with graphene showed the best frost suppression performance.The anti icing mechanism of the new hydrophobic surface is the oretically analyzed from the aspect of Laplace force.The anti-icing performance of superhydrophobic surface will be weakened under extreme conditions.Graphene was used as a photothermal material to prepare a photothermal superhydrophobic surface.The surface not only has stronger ability to delay icing,but also shows strong photothermal conversion performance under 808 nm near-infrared light,which can play the role of rapid deicing.The anti-icing mechanism and photothermal mechanism of photothermal superhydrophobic surface were analyzed,and the frost crystal morphology under low light intensity was analyzed.Practical research on photothermal superhydrophobic coatings has been carried out.Graphene photothermal superhydrophobic coating was applied to a small air source heat pump unit.At 0 ℃ and-5 ℃,compared with ordinary aluminum fins,the height of frost layer is reduced by 55% and 20%,The heat exchange performance of the evaporators of the two systems under frosting conditions is analyzed.The COP of the unit is increased by 12.3% and 18.9%.The heat exchange temperature is increased by 1.1 ℃ and 0.9 ℃ respectively.Figure 86;Reference 70...