Rebounding and splashing behavior of single water droplet impacting on cold superhydrophobic surface

LI Dong; WANG Xin; GAO Shangwen; CHEN Tong; ZHAO Xiaobao; CHEN Zhenqian

doi:10.11949/j.issn.0438-1157.20161518

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Rebounding and splashing behavior of single water droplet impacting on cold superhydrophobic surface

更新时间：2025-12-10

- Rebounding and splashing behavior of single water droplet impacting on cold superhydrophobic surface
- CIESC Journal Issue 6, Pages: 2473-2482(2017)
- 作者机构：
  
  1. 南京师范大学能源与机械工程学院,江苏,南京,210042
  2. 江苏省能源系统过程转化与减排技术工程实验室,江苏,南京,210042
  3. 东南大学能源与环境学院,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161518
  CLC： K124
- Online First：05 June 2017，
  
  Published：05 June 2017
- 稿件说明：
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LI Dong, WANG Xin, GAO Shangwen, et al. Rebounding and splashing behavior of single water droplet impacting on cold superhydrophobic surface[J]. CIESC Journal, 2017, (6): 2473-2482.
DOI：

LI Dong, WANG Xin, GAO Shangwen, et al. Rebounding and splashing behavior of single water droplet impacting on cold superhydrophobic surface[J]. CIESC Journal, 2017, (6): 2473-2482. DOI： 10.11949/j.issn.0438-1157.20161518.

摘要

对直径2.8 mm的液滴撞击冷表面的动态行为进行快速可视化观测，对比研究单液滴撞击普通冷表面以及超疏水冷表面的动力学特性，同时对初始撞击速度以及冷表面温度对液滴动态演化行为的影响进行了对比分析。实验结果表明：与液滴撞击普通冷表面（温度-25~-5℃）发生瞬时冻结沉积相比，液滴撞击超疏水冷表面时均未发生冻结，而且伴随铺展、回缩、反弹以及破碎行为；撞击速度越大，普通冷表面上液滴铺展因子越大，而且液滴越易冻结。液滴低速（We≤76）撞击超疏水冷表面会发生反弹现象，但速度对液滴最大铺展时间无影响；液滴高速（We≥115）撞击超疏水冷表面后会产生明显液指，而且破碎为多组卫星液滴。此外，冷表面温度仅影响液滴反弹高度，对液滴最大铺展因子以及液滴铺展时间影响较小。结果表明超疏水表面可显著抑制液滴撞击冷表面的瞬时冻结沉积。

Abstract

Dynamic behavior of a single water droplet with 2.8 mm in diameter impacting on cold surface was visually observed by high speed camera

the evolutional characteristics of water droplet impacting on cold superhydrophobic and bare aluminum surfaces were comparatively studied. Besides

the effect of initial impacting velocity and cold surface temperatures on the dynamic behavior of water droplet on cold surface were analyzed. The experimental result showed that compared with the instantly freezing of water droplet impacting on cold bare aluminum surface

the water droplet impacting on cold superhydrophobic surface (-25—-5℃) can not freeze along with spreading

retraction

rebound and smash behaviors. The higher the impacting velocity is

the bigger the spreading factor is and the more easily the water droplet freezes on cold bare aluminum surface. Moreover

rebounding behavior can be found when droplet impacts on the superhydrophobic surface with a low speed (We≤76) and velocity has no effect on the maximum spreading time. Also

obvious droplet fingers will appear and can be fragmented into many satellite droplets as droplet impacts on cold superhydrophobic surface with a high speed (We≥115). In addition

cold surface temperature has obvious effect on rebounding height but has little effect on the spreading factor and spreading time. The results indicate that the superhydrophobic surface can prevent the water droplet effectively from freezing instantly as the droplet impacts on cold surface.

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