基于近壁团簇分布的强化湿气冷凝的仿生表面

Biomimetic surface for enhancing humid air condensation based on cluster space distribution near wall

湿气中水的捕获是淡水获取、减湿等生产生活中的关键技术之一,其中优异的集水功能表面设计是研究热点。根据冷凝过程中近壁区分子团簇的分布规律与演化现象,从仿生的设计思路出发,提出了一种强化湿气冷凝的仿生结构。利用多孔铜柱模拟天竺葵表面分布的数量巨大、高度约300μm的纤毛结构,以强化近壁区团簇的捕获与核化。实验结果表明,空间结构的存在促进团簇的演化成核,进而增强表面的集水能力。高度为300μm的疏水多孔铜柱集水能力显著优于其他高度的结构,集水量高达140 mg·cm^(-2)·h^(-1),是光滑表面的2.4倍。研究为高湿度地区用于高效集水设施的强化表面设计提供了创新思路。

Water collection from humid air is a key technology for freshwater acquisition and dehumidification,and the design of functional surfaces with excellent water collection capability is critical.Enhanced biomimetic structure was proposed in this study according to the cluster space distribution near wall for humid air condensation.The experimental results show that the existence of spatial structure promotes the evolution and nucleation of clusters,which enhances water-collecting ability of the surface.Porous copper pillars were used to simulate ciliary structures distributed on geranium surface(with the height of 300μm)and enhance capture and nucleation of cluster.The results show that the water collection capability of the hydrophobic porous copper pillar reaches 140 mg·cm^(-2)·h^(-1),which is 2.4 times that of the smooth surface.This work can provide new idea for the design of water collection surfaces in high humidity areas.