Viscous droplet impingement on soft substrates

被引:2
|
作者
Lin, Marcus [1 ]
Quoc Vo [1 ]
Mitra, Surjyasish [2 ]
Tuan Tran [1 ,2 ]
机构
[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore, Singapore
[2] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore, Singapore
关键词
AIR-FILM; IMPACT; DYNAMICS; SURFACE;
D O I
10.1039/d2sm00709f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Viscous droplets impinging on soft substrates may exhibit several distinct behaviours including repeated bouncing, wetting, and hovering, i.e., spreading and retracting after impact without bouncing back or wetting. We experimentally study the conditions enabling these characteristic behaviours by systematically varying substrate elasticity, impact velocity and liquid viscosity. For each substrate elasticity, the transition to wetting is determined as the dependence of the Weber number We, which measures the droplet's kinetic energy against its surface energy, on the Ohnesorge number Oh, which compares viscosity to inertia and capillarity. We find that while We at the wetting transition monotonically decreases with Oh for relatively rigid substrates, it exhibits a counter-intuitive behaviour in which it first increases and then gradually decreases for softer substrates. We experimentally determine the dependence of the maximum Weber number allowing non-wetting impacts on substrate elasticity and show that it provides an excellent quantitative measure of liquid repellency for a wide range of surfaces, from liquid to soft surfaces and non-deformable surfaces.
引用
收藏
页码:5474 / 5482
页数:9
相关论文
共 50 条
  • [31] MODELING OF MOLTEN DROPLET IMPINGEMENT ON A NONFLAT SURFACE
    LIU, H
    LAVERNIA, EJ
    RANGEL, RH
    ACTA METALLURGICA ET MATERIALIA, 1995, 43 (05): : 2053 - 2072
  • [32] Effects of multi-dispersed droplet distribution on droplet impingement and ice accretion
    Zhu, Chengxiang
    Sun, Zhiguo
    Fu, Bin
    Zhu, Chunling
    Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics, 2010, 42 (05): : 620 - 624
  • [33] Evolution characteristics of droplet impingement on the wall of a liquid droplet radiator in a space environment
    Zhao, Fulong
    Dong, Xiang
    Zhao, Yuan
    Zhang, Hangyuan
    Wen, Jiming
    Fang, Huawei
    Tan, Sichao
    Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University, 2022, 43 (12): : 1677 - 1682
  • [34] Substrate elasticity and surface tension mediate the spontaneous rotation of active chiral droplet on soft substrates
    Lai, Xin
    Li, Shaofan
    JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 2022, 161
  • [35] Soft photomask lithography and droplet spreading nano-imprinting for manufacturing patterned sapphire substrates
    Tu, Pei-Chi
    Lee, Yung-Chun
    MICROELECTRONIC ENGINEERING, 2021, 241 (241)
  • [36] Substrate elasticity and surface tension mediate the spontaneous rotation of active chiral droplet on soft substrates
    Lai, Xin
    Li, Shaofan
    Journal of the Mechanics and Physics of Solids, 2022, 161
  • [37] DROPLET SPREADING ON A THIN VISCOUS FILM
    GAVER, DP
    GROTBERG, JB
    JOURNAL OF FLUID MECHANICS, 1992, 235 : 399 - 414
  • [38] Equilibria and their stability for a viscous droplet model
    Guidotti, Patrick
    NONLINEARITY, 2015, 28 (09) : 3175 - 3191
  • [39] Droplet dynamics on patterned substrates
    Dupuis, A
    Yeomans, JM
    PRAMANA-JOURNAL OF PHYSICS, 2005, 64 (06): : 1019 - 1027
  • [40] Droplet dynamics on patterned substrates
    A Dupuis
    J M Yeomans
    Pramana, 2005, 64 : 1019 - 1027