Study On Anti-icing Performance Of Micro-pillar Array Surface

The anti-icing performance of material surface is the focus of research and development in recent years.Many researchers change the state of the contact interface between the droplet and the material by fabricating the micro/nano-structure on the surface,which affect the freezing speed and adhesion of the droplet on the material,so that the droplet is easily separated from material surface by a small external force such as wind.Finally,anti-icing performance is achieved.The solidification of water droplets is a complex dynamic and thermodynamic process that can cause accidents such as air crashes.Therefore,the research on the anti-icing performance of the material surface has gradually become the focus of domestic and foreign scholars.Conventional CFD methods are difficult to simulate the above problems on a mesoscale.The lattice Boltzmann method(LBM)is a Particle-based CFD methods.Unlike conventional methods,It can accurately track the dynamic interface during the simulation of multiphase flow and phase transition,and has obvious advantages in fidelity and efficiency.Therefore,the lattice Boltzmann method is used to investigate the effect of surface topography on the anti-icing performance,so as to provide reference for the preparation of anti-icing materials.In this paper,the pseudo-potential model and thermal lattice boltzmann model with double distribution functions in LBM are applied to study the static wetting properties,dynamic wetting properties and icing process of droplets on the surface of three materials surface.The relationship between surface morphology of materials and static or dynamic wetting properties of materials was analyzed in detail.The simulation results show that for hydrophobic materials,the smaller the area fraction,the larger the contact angle,the smaller the rolling angle,the droplets are easily separated from the surface of the material quickly;the larger the impact velocity,the larger the maximum spreading diameter and the maximum rebound height,and the droplets collide with the micro-structure and micro/nano-structure surface are more easily detached;the surface with micro-structure or micro/nano-structure can significantly reduce the freezing speed of the droplets.