摘要
针对荷叶面超疏水现象及液滴碰撞界面的现象开展了相关力学实验研究。该研究基于显微镜、3D轮廓扫描仪等光学测试技术,在自主搭建了液体撞击高速摄影实验平台进行了液滴碰撞荷叶界面的动态力学实验。实验研究表明:荷叶表界面结构从中心区域向边缘区域微观乳突结构分布密集、平均高度、粗糙度、接触角角度等从内向外依次呈现减少趋势;当水滴从30 cm高度自由滴落至荷叶表面从中心区域向边缘区域,中心区域水滴首先呈现飞溅-汇聚-成球,依次向外呈现部分水滴形成星状飞溅、后收缩且不完全弹起或弹起部分在空中形成不规则形状,水滴在中心区域相比较边缘区域反弹高度低于中间区域,中间区域接触角略高于边缘区域等特征。
Based on optical testing techniques such as metallography microscope and 3D profile scanner,and combined with the self-built high-speed photography experimental platform of liquid impact,mechanical experiments are carried out to study the phenomenon of superhydrophobic surface of lotus leaf and the phenomenon of droplet collision interface.The results show that the microstructure of the interface structure of the leaf surface is densely distributed from the center area to the edge area,and the average height,roughness and contact angle decrease from the inside to the outside.When water droplets drop freely to the surface of lotus leaves from a height of 30 cm from the center area to the edge area,the water droplets in the center area first appear to splash,converge and form a ball,and then outward in turn,part of the water droplets form a star-shaped splash,and then shrink and bounce incompletely,or the bounce part forms an irregular shape in the air.Compared with the edge area,the rebound height of water droplets in the center area is lower than that in the middle area.The contact angle of the middle region is slightly higher than that of the edge region.
作者
罗宁
屈喆
蔡其金
彭维红
董纪伟
LUO Ning;QU Zhe;CAI Qijin;PENG Weihong;DONG Jiwei(School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Demonstration Center of Ideological and Political Teaching Research of Applied Mechanics Graduate Course,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)
出处
《实验室研究与探索》
CAS
北大核心
2023年第1期69-74,98,共7页
Research and Exploration In Laboratory
基金
国家自然科学基金项目(12072363)
江苏省教育科学“十四五”规划课题(D/2021/01/02)
中国矿业大学教学研究重点项目(2020ZD02)
中国矿业大学力学与土木工程学院教改课题(LXYM202112)
中国高等教育学会专项课题(21SZYB06)。
关键词
荷叶界面特征
界面疏水效应
液滴碰撞
3D轮廓扫描技术
高速摄影
interface characteristics of lotus leaf
interface hydrophobic effect
droplet collision
3D contour scanning technology
high speed photographic system
