Numerical study on the thermodynamic behavior of de‑icing liquid droplets impacting walls  

作　　者：Jing Cui Shuxin Niu Guangfeng Yang 

机构地区：[1]College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China

出　　处：《Advances in Aerodynamics》2024年第1期286-303,共18页空气动力学进展(英文)

基　　金：This research was funded by the National Natural Science Foundation of China(Grant number 52076212);the Tianjin Science and Technology Planning Project(Grant number 23JCZDJC00110);the Tianjin Research Innovation Project for Postgraduate Students(Grant number 2022SKYZ359).

摘　　要：Spraying de-icing fluid is a key method to ensure the safe operation of aircraft in icy and snowy weather.The film aggregation and internal mixing of de-icing fluid droplets on the aircraft skin during a collision are crucial.Considering the rheological proper-ties of the molecular viscosity change of the de-icing fluid droplets during the collision and the heat transfer model of the heat loss after the impact,the phase field method is used to capture the gas–liquid interface,and a thermal pressure/viscous cou-pling model is constructed.The thermodynamic behavior of different axial distances is calculated.The results show that,as the dimensionless axial distance of the droplet increases,the spreading length of the fused droplet decreases instead,and the heat transfer rate of the droplet increases with the increase in spreading length.After stabilizing,the increase or decrease in the heat transfer rate depends on the strength of the heat transfer between the liquid layers.As the dimensionless axial distance increases,the internal flow of the droplet weakens and,between the droplet and the wall,the heat flux density gradually decreases and the average temperature drop of the droplet becomes gradual.

关 键 词：Shear thinning Droplet impingement Liquid film spreading Retraction inhibition Thermal viscosity loss 

分 类 号：O35[理学—流体力学]