Wang Hao, Liu Cong, Zhan Haiyang, Liu Yahua
Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China.
ACS Omega. 2019 Jul 16;4(7):12238-12243. doi: 10.1021/acsomega.9b01348. eCollection 2019 Jul 31.
A droplet impacting on inclined surfaces yields more complex outcomes than on normal impact and the effect of the inclining angle on the impact dynamics is still in controversy. Here, we show that a drop impacting on inclined superhydrophobic surfaces exhibits an asymmetric rebound with a distinctive spreading and retraction along the lateral and tangential directions. Meanwhile, there is an obvious contact time reduction with the increase of the inclining angle and impact velocity. We demonstrate that the contact time reduction is attributed to the asymmetric drop spreading and retraction, which endows a fast drop detachment. Simple analyses are presented to interpret this phenomenon, which is in a good agreement with the experimental results.
液滴撞击倾斜表面会产生比垂直撞击更复杂的结果，且倾斜角度对撞击动力学的影响仍存在争议。在此，我们表明，液滴撞击倾斜的超疏水表面时会呈现不对称反弹，在横向和切向方向上有独特的铺展和回缩。同时，随着倾斜角度和撞击速度的增加，接触时间明显减少。我们证明，接触时间的减少归因于液滴不对称的铺展和回缩，这使得液滴能快速脱离。我们进行了简单分析来解释这一现象，分析结果与实验结果高度吻合。
