Numerical study of droplet impingement on surfaces with hierarchical structures

被引:4
|
作者
Yuan, Zhicheng [1 ]
Matsumoto, Mitsuhiro [1 ]
Kurose, Ryoichi [1 ]
机构
[1] Kyoto Univ, Dept Mech Engn & Sci, Kyoto, Japan
关键词
Droplet impingement; Numerical simulation; Hydrophobic surface; Hierarchical structures; Wetting stability; CASSIE-BAXTER STATE; SUPERHYDROPHOBIC SURFACES; ROUGHNESS; WETTABILITY; RESISTANCE; STABILITY; FABRICATION; TENSION; IMPACT; MODEL;
D O I
10.1016/j.ijmultiphaseflow.2021.103908
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Decorating a surface with pillars and grooves has been proved effective in enhancing its hydrophobicity. However, the poor stability of the non-wetting state is the main reason for limiting the practical applications of textured surfaces. In this study, a textured surface, with primary structures (taller) to improve hydrophobicity and secondary structures (shorter) to stabilize the non-wetting state, is proposed. The effects of the secondary structure, impingement position, and Weber number (We) on the deformation, penetration, and wetting state of a droplet on this surface are investigated by means of a three-dimensional direct numerical simulation (DNS). The results show that decorating the surface with hierarchical structures enhances both the surface hydrophobicity and the non-wetting stability due to the large breakthrough pressure brought by the secondary structures. The penetration depth and the emptying time decrease with the increase in the height of secondary structures. The impingement position, at the groove or the ridge, also plays a vital role in the non-wetting stability because of the difference in conversion between kinetic energy and surface energy. Surfaces with hierarchical structures require a significantly higher We to trigger the liquid penetration at the secondary structures We also influences the contact time and emptying time due to the abrupt change of surface roughness when liquid slides down the sidewall of the primary groove and then touches the secondary ridge. The two-step wetting transition found on the structured surface is well explained by the correlation of the Laplace's law, the Young's equation, and the Gibbs extension. It is seen that such hierarchical structures offer significant possibilities for the development of hydrophobic surfaces.
引用
收藏
页数:9
相关论文
共 50 条
  • [1] NUMERICAL SIMULATION OF WETTING PERFORMANCE OF WATER DROPLET ON PATTERNED SURFACES OF HIERARCHICAL MICRO STRUCTURES
    Zhou, W. N.
    Yan, Y. Y.
    [J]. PROCEEDINGS OF THE ASME 9TH INTERNATIONAL CONFERENCE ON NANOCHANNELS, MICROCHANNELS AND MINICHANNELS 2011, VOL 2, 2012, : 445 - 450
  • [2] Numerical study on impingement of a droplet upon a liquid film
    Liu, Hong
    Xie, Mao-zhao
    Wang, Suchun
    Jia, Ming
    [J]. FRONTIERS OF MANUFACTURING AND DESIGN SCIENCE, PTS 1-4, 2011, 44-47 : 2499 - 2503
  • [3] Numerical study of semi-molten droplet impingement
    H. Tabbara
    S. Gu
    [J]. Applied Physics A, 2011, 104
  • [4] Numerical study of droplet impingement and spreading on a moving surface
    Chen, Ningli
    Amirfazli, Alidad
    [J]. PHYSICS OF FLUIDS, 2023, 35 (09)
  • [5] Numerical study of semi-molten droplet impingement
    Tabbara, H.
    Gu, S.
    [J]. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2011, 104 (04): : 1011 - 1019
  • [6] Numerical modelling of droplet impingement
    Kamnis, S
    Gu, S
    [J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2005, 38 (19) : 3664 - 3673
  • [7] Numerical Study of Super-Cooled Droplet Impingement on Aeroengine
    Tan, Yan
    Wei, Wuguo
    [J]. MECHANIKA, 2020, 26 (01): : 25 - 30
  • [8] A numerical study of spray/wall impingement based on droplet impact phenomenon
    Ma, Tianyu
    Feng, Lei
    Wang, Hu
    Liu, Haifeng
    Yao, Mingfa
    [J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2017, 112 : 401 - 412
  • [9] A numerical study on turbulence attenuation model for liquid droplet impingement erosion
    Li, Rui
    Pellegrini, Marco
    Ninokata, Hisashi
    Mori, Michitsugu
    [J]. ANNALS OF NUCLEAR ENERGY, 2011, 38 (06) : 1279 - 1287
  • [10] NUMERICAL AND EXPERIMENTAL STUDY OF HYDRODYNAMICS OF MULTIPLE DROPLET STREAM IMPINGEMENT FOR ATOMIZATION
    Muthusamy, J. P.
    Zhang, Taolue
    Alvarado, Jorge L.
    [J]. 4TH THERMAL AND FLUIDS ENGINEERING CONFERENCE, ASTFE 2019, 2019,