Sustaining Robust Cavities with Slippery Liquid–Liquid Interfaces. Issue 7 (17th January 2022)

• Record Type: Journal Article
• Authors: Zhu, Suwan; Wu, Tao; Bian, Yucheng; Chen, Chao; Zhang, Yiyuan; Li, Jiawen; Wu, Dong; Hu, Yanlei; Chu, Jiaru; Li, Erqiang; Wang, Zuankai
• Is Part Of: Advanced science. Volume 9:Issue 7(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-17
• Subjects: cavity formation -- drag reduction -- droplet impact -- slippery surfaces -- water entry; Science -- Periodicals; 505
• DOI: 10.1002/advs.202103568
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: The formation of a stable gas cavity on the surfaces of solid bodies is essential for many practical applications, such as drag reduction and energy savings, owing to the transformation of the originally sticky solid–liquid interface into a free‐slip liquid–vapor interface by the creation of either liquid repellency or a Leidenfrost state on the surfaces. Here, it is shown that the simple infusion of a textured sphere with a smooth, slippery liquid layer can more easily create and sustain a stable gas cavity in a liquid at lower impact velocities compared to a dry solid sphere with the same contact angle. With a key parameter of curvature ratio, the early lamella dynamics during water entry of spheres and drops impact on planes are first unified. With the perspective of wetting transition, the unforeseen phenomenon of prone to cavity formation are successfully explained, which is the preferential lamella detachment from a slippery surface due to the higher viscosity of the lubricant relative to air. It is envisioned that the findings will provide an important and fundamental contribution to the quest for energy‐efficient transport. Abstract : The simple infusion of a textured sphere with a smooth, slippery liquid layer (termed as SLIPS sphere) can more easily create a stable gas cavity in water at lower impact velocities compared to a dry hydrophobic sphere with the same contact angle, due to the preferential water lamella detachment from the slippery surface.