Affiliation:
1. Department of Mechanical Engineering City University of Hong Kong Hong Kong 999077 China
2. Hong Kong Center for Cerebro‐Cardiovascular Health Engineering (COCHE) Hong Kong 999077 China
3. School of Mechanical and Aerospace Engineering Jilin University Changchun Jilin 130025 China
4. Department of Mechanical Engineering Hong Kong Polytechnic University Hong Kong 999077 China
Abstract
AbstractRapid detachment of impacting droplets from underlying substrate is highly preferred for mass, momentum, and energy exchange in many practical applications. Driven by this, the past several years have witnessed a surge in engineering macrotexture to reduce solid‐liquid contact time. Despite these advances, these strategies in reducing contact time necessitate the elegant control of either the spatial location for droplet contact or the range of impacting velocity. Here, this work circumvents these limitations by designing a dual gradient surface consisting of a vertical spacing gradient made of tapered pillar arrays and a lateral curvature gradient characterized as macroscopic convex. This design enables the impacting droplets to self‐adapt to asymmetric or pancake bouncing mode accordingly, which renders significant contact time reduction (up to ≈70%) for a broad range of impacting velocities (≈0.4–1.4 m s−1) irrespective of the spatial impacting location. This new design provides a new insight for designing liquid‐repellent surfaces, and offers opportunities for applications including dropwise condensation, energy conversion, and anti‐icing.
Funder
Tencent
Science and Technology Planning Project of Guangdong Province
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
1 articles.
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