液滴撞击固体表面铺展特性的实验研究

Experimental study of spread characteristics of droplet impacting solid surface

利用高速摄影仪记录了不同液滴撞击固体表面的形态变化过程,并探讨了液滴撞击参数对撞击过程液滴形态的影响.结果表明:液滴黏度对液滴铺展过程起着决定性作用,液滴表面张力对液滴铺展后的回缩起到主导作用,两者的共同作用决定着液滴的震荡特性;撞击速度的提高会增大液滴的最大铺展因子,但达到最大铺展的时间因表面张力的不同呈现不同变化规律.

The processes of different droplets impacting the solid surface are recorded using a high-speed digital came and the effects of the impact parameters on the droplet impact are studied. The results show that the viscosity of droplet plays a decisive role in spreading process, and surface tension has a leading influence on recoiling process. These two factors jointly determine the oscillation characteristics. The maximum spread factor increases with impact velocity increasing, however, the time from the beginning to achieve the maximum spreading factor shows different variation rules due to surface tension.