Morphology of gas cavities on patterned hydrophobic surfaces under   reduced pressure

doi:10.1063/1.4931674

CORC > 北京大学 > 工学院

	Morphology of gas cavities on patterned hydrophobic surfaces under reduced pressure
	Xue, Yahui ; Lv, Pengyu ; Liu, Ying ; Shi, Yipeng ; Lin, Hao ; Duan, Huiling
刊名	PHYSICS OF FLUIDS
	2015
关键词	SUPERHYDROPHOBIC SURFACES BUBBLE NUCLEATION CAVITATION STABILIZATION ADHESION GEOMETRY FLUID
DOI	10.1063/1.4931674
英文摘要	Gas cavities trapped on structured hydrophobic surfaces play important roles in realizing functionalities such as superhydrophobicity, drag reduction, and surface cleaning. The morphology of the cavities exhibits strong dependence on system parameters which impact the performance of these surfaces. In this work, a complete theoretical analysis is presented to predict cavity morphological change under reduced liquid pressure, on a submerged hydrophobic surface patterned with cylindrical pores. Equilibrium solutions are derived for five different phases, namely, (I) pinned recession, (II) depinned recession, (III) Cassie-Baxter, (IV) expansion, and (V) coalescence; their stabilities are also analyzed. A phase map is developed outlining the different regimes with respect to the gas amount and liquid pressure. Importantly, phase (IV) exhibits a complex stability behavior that leads to two possible routes to coalescence, which lends two different mechanisms of cavitation. Accordingly, the threshold pressure for cavitation can be calculated. The theoretical model is supported by direct experimental measurements via confocal microscopy and demonstrates good quantitative accuracy. This work provides a predictive tool for the design of functional structured hydrophobic surfaces. (C) 2015 AIP Publishing LLC.; National Natural Science Foundation of China (NSFC) [11225208, 11172001, 11328201, 11521202]; NSF [CBET-0747886]; key subject "Computational Solid Mechanics" of China Academy of Engineering Physics; SCI(E); EI; ARTICLE; hlin@jove.rutgers.edu; hlduan@pku.edu.cn; 9; 27
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/416551]
专题	工学院
推荐引用方式 GB/T 7714	Xue, Yahui,Lv, Pengyu,Liu, Ying,et al. Morphology of gas cavities on patterned hydrophobic surfaces under reduced pressure[J]. PHYSICS OF FLUIDS,2015.
APA	Xue, Yahui,Lv, Pengyu,Liu, Ying,Shi, Yipeng,Lin, Hao,&Duan, Huiling.(2015).Morphology of gas cavities on patterned hydrophobic surfaces under reduced pressure.PHYSICS OF FLUIDS.
MLA	Xue, Yahui,et al."Morphology of gas cavities on patterned hydrophobic surfaces under reduced pressure".PHYSICS OF FLUIDS (2015).