Study of oblique impingement of water droplets on superhydrophobic surfaces patterned with micropillars: A lattice Boltzmann approach

doi:10.1016/j.applthermaleng.2024.125231

IMECH-IR > 微重力重点实验室

	Study of oblique impingement of water droplets on superhydrophobic surfaces patterned with micropillars: A lattice Boltzmann approach
	Wang G(王耿)1; Sohani, Sara Mesgari 2; Yang, Junyu 2; Lei, Timan 2; Chen, Jin 2; He, Ruitian 2; Luo, KH 2,3
通讯作者	Luo, Kai H.([email protected])
发表期刊	APPLIED THERMAL ENGINEERING
	2025-03-01
卷号	262 页码:13
ISSN	1359-4311
摘要	Normal impingement of droplets on superhydrophobic surfaces patterned with micropillars exhibits pancake bouncing, significantly reducing the droplet-surface contact time under certain conditions. However, after pancake bouncing, the droplets retract, leading to secondary contact with the substrate, which is undesirable in some engineering applications. To inhibit such undesired secondary impacts, oblique impingement on super- hydrophobic surfaces can be employed, inducing asymmetric dynamics that are not well understood. With over 80 sets of three-dimensional lattice Boltzmann simulations of oblique impingement of droplets on super- hydrophobic surfaces patterned with micropillars, a regime diagram that encompasses a broad range of vertical (Wev) and horizontal (Weh) Weber numbers is constructed to describe the impact outcomes of droplets. We explain the impingement mechanisms from both dynamics and energy evolution perspectives. A theoretical model is built to predict the penetration depth (Delta hmin) of the droplet in superhydrophobic micropillar surfaces under different Wev. We discover that droplets experience pancake bouncing without secondary impact when Wev exceeds 35 and Weh is higher than 8 at the same time. The total contact time of the droplet oblique impingement is reduced by an order of magnitude compared to that of the normal impingement. According to our dynamics and energy evolution analysis, with an increase in Wev, the droplet rebounds to a greater height during pancake bouncing, which prevents the contact of the recoiling droplet cusp with the surface. Furthermore, a higher Weh amplifies the droplet's central viscous dissipation, thereby mitigating the central recoil of the droplet.
关键词	Lattice Boltzmann method Droplet dynamics Superhydrophobic surfaces Bouncing
DOI	10.1016/j.applthermaleng.2024.125231
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001393725300001
关键词[WOS]	CONTACT TIME ; IMPACT
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics
WOS类目	Thermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics
资助项目	UK Engineering and Physical Sciences Research Council[EP/X035875/1]
项目资助者	UK Engineering and Physical Sciences Research Council
论文分区	一类
力学所作者排名	1
RpAuthor	Luo, Kai H.
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/98117
专题	微重力重点实验室
作者单位	1.Chinese Acad Sci, Natl Micrograv Lab, Inst Mech, Beijing 100190, Peoples R China; 2.UCL, Dept Mech Engn, Torrington Pl, London WC1E 7JE, England; 3.Zhejiang Univ, Shanghai Inst Adv Study, Shanghai 201203, Peoples R China
推荐引用方式 GB/T 7714	Wang G,Sohani, Sara Mesgari,Yang, Junyu,et al. Study of oblique impingement of water droplets on superhydrophobic surfaces patterned with micropillars: A lattice Boltzmann approach[J]. APPLIED THERMAL ENGINEERING,2025,262:13.Rp_Au:Luo, Kai H.
APA	王耿.,Sohani, Sara Mesgari.,Yang, Junyu.,Lei, Timan.,Chen, Jin.,...&Luo, KH.(2025).Study of oblique impingement of water droplets on superhydrophobic surfaces patterned with micropillars: A lattice Boltzmann approach.APPLIED THERMAL ENGINEERING,262,13.
MLA	王耿,et al."Study of oblique impingement of water droplets on superhydrophobic surfaces patterned with micropillars: A lattice Boltzmann approach".APPLIED THERMAL ENGINEERING 262(2025):13.