Ultimate jumping of coalesced droplets on superhydrophobic surfaces

Zhiping Yuan, Sihang Gao, Zhi Feng Hu, Liyu Dai, Huimin Hou, Fuqiang Chu, Xiaomin Wu*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

42 引用 (Scopus)

摘要

Hypothesis: Jumping of coalesced droplets on superhydrophobic surfaces (SHSs) is widely used for enhanced condensation, anti-icing/frosting, and self-cleaning due to its superior droplet transport capability. However, because only a tiny fraction (about 5%) of the released excess surface energy during coalescence can be transformed into jumping kinetic energy, the jumping is very weak, limiting its application. Methods: We experimentally propose enhanced jumping methods, use machine learning to design structures that achieve ultimate jumping, and finally combine experiments and simulations to investigate the mechanism of the enhanced jumping. Finding: We find that a more orderly flow inside the droplets through the structure is the key to improve energy transfer efficiency and that the egg tray-like structure enables the droplet to jump with an energy transfer efficiency 10.6 times higher than that of jumping on flat surfaces. This energy transfer efficiency is very close to the theoretical limit, i.e., almost all the released excess surface energy is transformed into jumping kinetic energy after overcoming viscous dissipation. The ultimate jumping enhances the application of water droplet jumping and enables other low surface energy fluid such as R22, R134a, Gasoline, and Ethanol, which cannot jump on a flat surface, to jump.

源语言英语
页(从-至)429-436
页数8
期刊Journal of Colloid and Interface Science
587
DOI
出版状态已出版 - 4月 2021
已对外发布

指纹

探究 'Ultimate jumping of coalesced droplets on superhydrophobic surfaces' 的科研主题。它们共同构成独一无二的指纹。

引用此