中文摘要：

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。

英文摘要：

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