How Superhydrophobic Grooves Drive Single-Droplet Jumping

被引:18
|
作者
Chu, Fuqiang [1 ]
Yan, Xiao [2 ]
Miljkovic, Nenad [2 ,3 ,4 ]
机构
[1] Univ Sci & Technol Beijing, Sch Energy & Environm Engn, Beijing 100083, Peoples R China
[2] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA
[3] Univ Illinois, Elect & Comp Engn & Mat Res Lab, Urbana, IL 61801 USA
[4] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka 8190395, Japan
基金
美国国家科学基金会;
关键词
DROPWISE CONDENSATION; NUMERICAL SIMULATIONS; SURFACES; COALESCENCE; GROWTH;
D O I
10.1021/acs.langmuir.2c00373
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Rapid shedding of microdroplets enhances the performance of self-cleaning, anti-icing, water-harvesting, and condensation heat-transfer surfaces. Coalescence-induced droplet jumping represents one of the most efficient microdroplet shedding approaches and is fundamentally limited by weak fluid-substrate dynamics, resulting in a departure velocity smaller than 0.3u, where u is the capillary-inertia-scaled droplet velocity. Laplace pressure-driven single-droplet jumping from rationally designed superhydrophobic grooves has been shown to break conventional capillary-inertia energy transfer paradigms by squeezing and launching single droplets independent of coalescence. However, this interesting droplet shedding mechanism remains poorly understood. Here, we investigate single-droplet jumping from superhydrophobic grooves by examining its dependence upon surface and droplet configurations. Using a volume of fluid (VOF) simulation framework benchmarked with optical visualizations, we verify the Laplace pressure contrast established within the groove-confined droplet that governs single-droplet jumping. An optimal departure velocity of 1.13u is achieved, well beyond what is currently available using condensation on homogeneous or hierarchical superhydrophobic structures. We further develop a jumping/non-jumping regime map in terms of surface wettability and initial droplet volume and demonstrate directional jumping under asymmetric confinement. Our work reveals key fluid-structure interactions required for the tuning of droplet jumping dynamics and guides the design of interfaces and materials for enhanced microdroplet shedding for a plethora of applications.
引用
收藏
页码:4452 / 4460
页数:9
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