Khanzadeh Borjak Sedigheh, Rafee Roohollah, Valipour Mohammad Sadegh
Faculty of Mechanical Engineering, Semnan University, Semnan 35131-19111, Iran.
Langmuir. 2020 Nov 17;36(45):13498-13508. doi: 10.1021/acs.langmuir.0c02228. Epub 2020 Nov 4.
The impinging of water droplets on superhydrophobic cylindrical glasses has been investigated experimentally by using a high-speed camera. The superhydrophobic cylindrical surfaces were fabricated by electrospinning technique combined with silane treatment. The effects of the diameter ratio of cylindrical glass and Weber number on the postimpact regime, contact time, maximum spreading factor, and splash threshold were investigated in the ranges 3.5-16 and 27-161, respectively. The results were compared with impact droplets on superhydrophobic flat glass and uncovered hydrophilic cylindrical glass. Three types of regimes were observed on hydrophilic and superhydrophobic cylindrical glasses including coating, splash, and splash-rebound. Results showed that contact time on the cylindrical surface is up to 50% less than the flat one. Moreover, the splash regime was started at the critical Weber number = 134 on high-diameter-ratio superhydrophobic cylindrical and flat surfaces while happening earlier when the diameter ratio is below * < 4.
通过使用高速摄像机对水滴撞击超疏水圆柱形玻璃进行了实验研究。超疏水圆柱形表面采用静电纺丝技术结合硅烷处理制备。分别在3.5 - 16和27 - 161范围内研究了圆柱形玻璃的直径比和韦伯数对撞击后状态、接触时间、最大铺展因子和飞溅阈值的影响。将结果与超疏水平板玻璃和未覆盖的亲水性圆柱形玻璃上的撞击水滴进行了比较。在亲水性和超疏水圆柱形玻璃上观察到三种类型的状态，包括涂层、飞溅和飞溅反弹。结果表明，圆柱形表面上的接触时间比平面表面上的接触时间减少了50%。此外，在高直径比的超疏水圆柱形和平板表面上，飞溅状态在临界韦伯数 = 134时开始，而当直径比低于4时，飞溅状态更早发生。
