Study of oblique impingement of water droplets on superhydrophobic surfaces patterned with micropillars: A lattice Boltzmann approach
文献类型：期刊论文
| 作者 | Wang G(王耿)3; Sohani, Sara Mesgari2; Yang, Junyu2; Lei, Timan2; Chen, Jin2; He, Ruitian2; Luo, KH1,2 |
| 刊名 | APPLIED THERMAL ENGINEERING
 |
| 出版日期 | 2025-03-01 |
| 卷号 | 262页码:13 |
| 关键词 | Lattice Boltzmann method Droplet dynamics Superhydrophobic surfaces Bouncing |
| ISSN号 | 1359-4311 |
| DOI | 10.1016/j.applthermaleng.2024.125231 |
| 通讯作者 | Luo, Kai H.(k.luo@ucl.ac.uk) |
| 英文摘要 | 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. |
| 分类号 | 一类 |
| WOS关键词 | CONTACT TIME ; IMPACT |
| 资助项目 | UK Engineering and Physical Sciences Research Council[EP/X035875/1] |
| WOS研究方向 | Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:001393725300001 |
| 资助机构 | UK Engineering and Physical Sciences Research Council |
| 其他责任者 | Luo, Kai H. |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/98116]  |
| 专题 | 力学研究所_国家微重力实验室 |
| 作者单位 | 1.Zhejiang Univ, Shanghai Inst Adv Study, Shanghai 201203, Peoples R China 2.UCL, Dept Mech Engn, Torrington Pl, London WC1E 7JE, England; 3.Chinese Acad Sci, Natl Micrograv Lab, Inst Mech, Beijing 100190, 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. |
| 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. |
入库方式： OAI收割
来源：力学研究所
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