水雾粒径对冰附着力影响的实验研究

摘要

Ice adhesion strength is the interaction between the ice and the solid substrate.Research about how experimental parameters influence ice adhesion strength is important to the understanding of the mechanism of ice adhesion strength,the developing of anti-ice method and the analysis of the Ice shedding.In the experiments,the same substrate and the liquid water content are used,and the ice adhesion strength is measured at different temperatures (-25～0℃) and different mean volumetric diameters (40,80 and 250μm).Different from freezer ice,there exists a turning point for impact ice as the pattern of the ice adhesion strength changes due to the variation of temperature,which can be called the critical temperature.As the temperature decreasing from 0℃,above the critical temperature the ice adhesion strength does not depend on whether it is freezer ice or impact ice.But below the critical temperature,the ice adhesion strength of impact ice is lower,with the ice regime transforming from glaze ice to rime ice.The critical temperature changes as the mean volumetric diameter changes,so as the variation trend of the ice adhesion strength.%冰附着力是冰与基底表面之间的作用力,研究环境参数对冰附着力的影响对认识冰附着力机理、开发防除冰方法以及分析融冰和脱冰特性具有重要的意义.在基底不变的条件下,实验研究了静态结冰以及相同水含量、不同平均粒径(40、80、250μm)的水雾在不同温度(-25～0℃)下的动态结冰的冰附着力(剪切力)的变化情况.相对于静态结冰,动态结冰的冰附着力随温度的变化存在一个转折点,可称该转折点所对应的温度为临界温度.在临界温度以上,冰附着力随温度的降低而增加,成冰方式对冰附着力影响不大;而在临界温度以下,动态结冰所成冰的冰附着力相对于静态结冰明显要小,所成冰从明冰向混合冰或者霜冰转变.水雾平均粒径不同,临界温度随之变化,动态结冰的冰附着力随温度的变化趋势也随之变化.