CAJ | 학술논문

为了研究水滴撞击固体表面的影响因素,利用高速摄影仪记录了水滴撞击不同固体表面的形态变化过程,记录速度为2 000 f/s.实验是在常温大气环境中进行的,水滴的初始直径固定在(1.8士0.05)mm.对不同材料和不同表面粗糙度的固体表面以及不同撞击角度进行了实验观察,并采用图像处理技术获得不同条件对液滴撞击固体表面行为的影响.实验结果表明:不同固体表面、不同表面粗糙度和撞击角度对液滴撞击固体表面后的润湿行为有非常显著的影响.随着We由50增大到300,液滴撞击在非润湿性表面上会出现部分反弹、反弹甚至飞溅现象;相同固体表面的表面粗糙度增大使撞击过程的接触角变小.
위료연구수적당격고체표면적영향인소,이용고속섭영의기록료수적당격불동고체표면적형태변화과정,기록속도위2 000 f/s.실험시재상온대기배경중진행적,수적적초시직경고정재(1.8사0.05)mm.대불동재료화불동표면조조도적고체표면이급불동당격각도진행료실험관찰,병채용도상처리기술획득불동조건대액적당격고체표면행위적영향.실험결과표명:불동고체표면、불동표면조조도화당격각도대액적당격고체표면후적윤습행위유비상현저적영향.수착We유50증대도300,액적당격재비윤습성표면상회출현부분반탄、반탄심지비천현상;상동고체표면적표면조조도증대사당격과정적접촉각변소.
In order to investigate the effect factors of water droplet impacted on the solid surfaces, the impaction process was recorded using a high-speed digital camera at 2 000 f/s. All experiments were performed in atmospheric air, and the initial droplet diameter was fixed at (1. 8 ± 0. 05) mm. When the droplet impacts on the solid surfaces with the different physical characteristics, the effects of different surface roughness and impact angles were separately researched in the experiment. An image processing technique was applied to analyze the effect of different factors. The experimental results indicate that there are remarkable influences of the different solid surfaces, the surface roughness and impact angle on the impaction process. When Weber number increases from 50 to 300, the droplet respectively experiences partly rebound, rebound and splash change after impacting on a hydrophobic surface. The rougher the same solid surface is, the smaller the contact angle of the impaction process is.