摘要
本文通过可视化实验研究了不同直径液滴撞击亲水壁面的动态特性.实验利用光学原理同时记录了液滴撞击壁面过程的正面及底面图像。实验结果表明:液滴最大铺展因数随液滴初始直径近似呈线性增长关系;随液滴直径增大,液滴铺展至最大时需要的绝对时间、滞留时间、回缩时间均增长,稳定时的液固接触面积变大;液滴铺展至最大铺展因数所需要的无量纲时间约为1.68;液滴直径越小,则撞击后液膜回缩更为迅速.
The dynamic behaviors of droplets with various diameters impact on a hydrophilic surface were experimentally studied in this paper. In the present experiments, an optical method was used to photograph the front and bottom views of droplets impacting process at the same time. The experimental results showed that there was an approximate linear relationship between the droplet maximum spread factor and its initial diameter. As the droplet diameter increased, the processes of the maximum spread time, the retention time and the retraction time would be extended, and the terminal liquid-solid contact area was larger when the droplet stabilized. The dimensionless time for the droplet spreading to the maximum was around 1.68. The liquid film retracted fast was observed in the small size droplet
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2014年第1期91-94,共4页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展计划(973计划)(No.2012CB720403)
国家自然科学基金项目(No.50906102
No.51106188)
重庆市自然科学基金项目(No.CSTC2011jjA90015)
教育部留学回国人员科研启动基金(No.教外司留[2010]1561号)
关键词
液滴撞击
直径
动态特性
可视化实验
droplet impact
diameter
dynamic characteristics
visualization experiment
