Modeling and Parametric Study of Ice Interface Growth During Microdroplet Impinging on Different Micro-Textures

Abstract

Owing to supercooled droplets endangering aviation aircraft are microscale, the icing and impingement of microdroplet on microstructure (i.e., microscale-confined condensation) is still vague. The mechanism of ice-water phase front growth on free interface of impinged microdroplets, has gained much attention. This paper aims at retarding freezing on ice phase interface propulsion of microdroplets, influence of spatial morphology of micro-texture on dendritic front growth speed of ice-water interface is revealed. Two types of micro-textures: micro-terraces and micro-columns, are considered. The dynamic method of Coupled Level Set and Volume of Fluid (CLSVOF), and Enthalpy-porosity technique is coupled for determination of the ice-water interface. The reduction influence of breakage on droplet freezing velocity have been uncovered. The possibility of regulating micro-texture arrays to slow freezing of dual micro-droplets was analyzed. Results show that reducing inclination and increasing intervals can reduce freezing rate and droplet contact time, but when inclination reduced to 70°, reducing inclination influences little. Inclination reduction can prompt droplet impingement fracture, and prompting breakage can slow down freezing (48.7% in 8 m/s). The higher the degree of undercooling, the less likely for breakage.