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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.
In this paper, we have studied the dynamic characteristics of droplets with different diameters colliding with the hydrophilic wall through a visualization experiment.The optical and optical principles were used to record the frontal and bottom images of the droplet impacting the wall surface simultaneously. The experimental results show that the maximum spreading factor of droplets has a linear relationship with the initial diameter of droplet. With the increase of droplet diameter, the absolute time, residence time and retraction time required for spreading the droplets to the maximum are all increasing. Liquid-solid contact area becomes larger; the dimensionless time required for spreading the droplets to the maximum spreading factor is about 1.68; the smaller the droplet diameter, the faster the liquid film retracts after impact.