个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 无
性别:男
毕业院校:香港城市大学
学位:博士
所在单位:机械工程学院
学科:机械制造及其自动化
办公地点:知方楼7019室
联系方式:0411-84707924
电子邮箱:yahualiu@dlut.edu.cn
Faceted and Circular Droplet Spreading on Hierarchical Superhydrophobic Surfaces
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论文类型:期刊论文
发表时间:2020-01-21
发表刊物:LANGMUIR
收录刊物:PubMed、EI、SCIE
卷号:36
期号:2
页面范围:534-539
ISSN号:0743-7463
摘要:Bouncing of water droplets on the post-built superhydrophobic surfaces was studied. The topography of the surfaces was constituted by PDMS conical posts decorated with ZnO nanoparticles. Droplet impact on surface topographies built of posts with varied configuration and separation was studied under different Weber numbers. Faceted spreading and retraction of droplets were observed. Square-, pentagon-, and hexagon-shaped droplets were registered. It was shown that the nature of droplet spreading depended on both the Weber number and the topography of the post arrays. Even bouncing under small Weber numbers We congruent to 6.5 resulted in the Cassie-Wenzel transitions, starting from the area adjacent to the axis of droplets, and the area exposed to the wetting transitions scaled as S-tr similar to We(4/5). During spreading, two main stages were recorded as the kinematic (inertial) stage and the viscous stage. The viscous stage, in turn, appeared as a consequence of two substages governed by various time scaling laws. The faceted triple line was observed for the Cassie-like retraction of droplets.