Self-Adaptive Droplet Bouncing on a Dual Gradient Surface

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

1 Scopus Citations
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Original languageEnglish
Journal / PublicationSmall
Publication statusOnline published - 2 Oct 2023

Abstract

Rapid 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. © 2023 Wiley-VCH GmbH.

Research Area(s)

  • contact time, droplet bouncing, dual gradient, fluid dynamics, self-adaptive

Citation Format(s)

Self-Adaptive Droplet Bouncing on a Dual Gradient Surface. / Wu, Chenyang; Qin, Xuezhi; Zheng, Huanxi et al.
In: Small, 02.10.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review