| 摘要: |
| 本文利用刻蚀方法制备的铝基超疏水表面，在环境温度20 ℃、相对湿度60%下进行了不同基底温度（﹣15 ℃、﹣20 ℃、﹣25 ℃、﹣30 ℃）超疏水表面的静态和动态低温液滴抗结冰性能实验研究。结果表明：超疏水表面在液滴静、动态下均表现出良好抗结冰性能；在静态液滴抗结冰实验中，随着冷表面温度的降低，超疏水表面延缓结冰的时间会快速下降，在基底温度为﹣25 ℃时，其抗结冰性能发生突变，并随冷表面温度的进一步降低而表现恶化；在动态液滴抗结冰实验中，冷表面温度在-﹣15 ℃、﹣20 ℃时，低温液滴能快速从低温表面弹离，而当冷表面温度为﹣25 ℃、﹣30 ℃时，低温液滴不能从超疏水表面弹离，滞留在超疏水表面上，且快速在其上冻结，超疏水表面失去了抗结冰性能。基于相关相变成核理论，分析了其抗结冰的机理。为超疏水表面在冬季空调室外换热器上的应用提供一定参考。 |
| 关键词: 铝基超疏水表面 抗结冰 |
| DOI： |
|
| 基金项目:国家自然科学基金（51676129）资助项目。 |
|
| Experimental Study on Anti-icing Performance of Aluminium-based Super-hydrophobic Surface under Different Substrate Temperatures |
|
Wu Weidong, Wang Feifei, Shen Rui, Wang Delong
|
| (Institute of Refrigeration and Cryogenics Engineering, University of Shanghai for Science and Technology) |
| Abstract: |
| The anti-icing performance of a super-hydrophobic surface, which was aluminum-based surface prepared by an etching method, at different substrate temperatures of ﹣15, ﹣20, ﹣25, ﹣30 ℃ for both static and dynamic cryogenic liquid droplets were experimentally investigated under an ambient temperature of 20 ℃ and relative humidity of 60%. Results showed that the super-hydrophobic surface presented good anti-icing performance under both static and dynamic conditions of liquid droplets. In static liquid droplet anti-icing experiments, the freezing time of the super-hydrophobic surface decreased rapidly as the cold surface temperature was decreased. When the substrate temperature was ﹣25 ℃, the anti-icing performance of the super-hydrophobic surface changed abruptly. The anti-icing performance of the super-hydrophobic surface worsened as the temperature of the cold surface decreased. In dynamic liquid droplet anti-icing experiments, at surface temperatures of ﹣15 and ﹣20 ℃, liquid drops were able to rapidly rebound off the low-temperature surface. When the surface temperature was ﹣25 and ﹣30 ℃, respectively, low-temperature liquid droplets froze quickly and were incapable of rebounding off the super-hydrophobic surface, i.e., the super-hydrophobic surface lost the ability of anti-icing. Anti-icing mechanisms were analyzed according to the phase change nucleation theory. The research results are expected to provide a reference for the application of super-hydrophobic surfaces in outside heat exchangers for winter air conditioning. |
| Key words: aluminum-based super-hydrophobic surface anti-icing |
