How supercooled superhydrophobic surfaces affect dynamic behaviors of impacting water droplets?

被引:62
作者
Ding, Bin [2 ]
Wang, Hong [1 ,2 ]
Zhu, Xun [1 ,2 ]
Chen, Rong [1 ,2 ]
Liao, Qiang [1 ,2 ]
机构
[1] Chongqing Univ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400030, Peoples R China
[2] Chongqing Univ, Inst Engn Thermophys, Chongqing 400030, Peoples R China
基金
国家杰出青年科学基金; 中国国家自然科学基金;
关键词
Dynamic behaviors; Impact; Superhydrophobic; Supercooled; Water droplet; FREEZING PROCESSES; VISCOSITY; TIME;
D O I
10.1016/j.ijheatmasstransfer.2018.03.112
中图分类号
O414.1 [热力学];
学科分类号
摘要
Water droplet icing on the supercooled surface is ubiquitous and presents gigantic harmfulness on the power transmission lines, aircraft and outdoor equipment. Therefore, a good understanding of droplet impact and freezing process on the supercooled superhydrophobic surface is crucial. In this paper, aluminium sheet was adopted as the substrate to prepare the superhydrophobic (SH) surface. A high-speed camera was applied to explore the dynamic behaviors of a water droplet impacting on the SH surface with various supercooling degrees visually. Moreover, the droplet spreading factor, dimensionless height, characteristics time, rebounding energy and mass fraction of the secondary droplets were adopted to reflect the dynamic behaviors. The results indicate that the dynamic behaviors of a droplet (with an initial temperature of 15 degrees C, equivalent diameter of 2.94 mm and impacting velocity of 0.99 m.s(-1)) impacting on the SH surface (160 degrees in static contact angle) with a lower supercooling degree is consisted of three regimes: spreading, retraction and rebounding. Whereas, the retraction and rebounding regime are limited at -17 degrees C and -24 degrees C, respectively. Moreover, in the retraction regime, the governing factor of the droplet frozen onset time transforms from the interface heat transfer ability into incubation time at the surface temperature below -34.4 degrees C. Furthermore, the droplet separating and rebounding are prevented once the remaining energy at the end of the retraction regime is lower than 35% of the droplet initial energy. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1025 / 1032
页数:8
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