https://scholars.lib.ntu.edu.tw/handle/123456789/598167
標題: | Phase diagram for nanodroplet impact on solid surfaces | 作者: | Ma Q Wang Y.-F Wang Y.-B He X Zheng S.-F Yang Y.-R Wang X.-D Lee D.-J. DUU-JONG LEE |
關鍵字: | Contact angle;Hydrophobicity;Molecular dynamics;Surface chemistry;Classifieds;Hydrophobic surfaces;Impact dynamics;Nano-droplets;Parameter spaces;Solid surface;Surface wettability;Three categories;Water nanodroplets;Weber numbers;Phase diagrams | 公開日期: | 2021 | 卷: | 33 | 期: | 10 | 來源出版物: | Physics of Fluids | 摘要: | The impact dynamics of water nanodroplets on flat solid surfaces was studied by molecular dynamics simulations over a wide range of Weber numbers (We) and surface wettability (θ0), where θ0 is the Young contact angle. A phase diagram in the parameter space of We vs θ0 was established accommodating eight impact outcomes noted in the final stage of impact, with three of them, holes rebound, partial-rebound splash, and rebound splash, for the first time being identified and reported. The eight impact outcomes were classified into three categories, i.e., non-bouncing, bouncing, and splash. The results show that the splash is triggered only when Wecr > 140. The boundaries separating bouncing from non-bouncing were determined based on the phase diagram. When θ0 > 160°, the boundary is described as Wecr = a 1; when 110° < θ0 < 160°, the boundary depends on both We and θ0, with a larger We required to trigger bouncing on a less hydrophobic surface, expressed as Wecr = b + ccosθ0; when θ0 < 110°, bouncing never takes place, and hence, the boundary is determined only by the critical contact angle, expressed as θ0,cr = 110°. Here, a, b, and c are constants. ? 2021 Author(s). |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85118183030&doi=10.1063%2f5.0067780&partnerID=40&md5=c42fb54291f0848f0233955c18ae42d8 https://scholars.lib.ntu.edu.tw/handle/123456789/598167 |
ISSN: | 10706631 | DOI: | 10.1063/5.0067780 |
顯示於: | 化學工程學系 |
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