Curvature effect of electrowetting-induced droplet detachment

被引:8
|
作者
Xiao, Ke [1 ]
Wu, Chen-Xu [1 ]
机构
[1] Xiamen Univ, Fujian Prov Key Lab Soft Funct Mat Res, Dept Phys, Coll Phys Sci & Technol, Xiamen 361005, Peoples R China
基金
中国国家自然科学基金;
关键词
SUPERHYDROPHOBIC SURFACES; CONTACT-ANGLE; DYNAMICS; SUBSTRATE; STATICS; IMPACT; MODEL; LINE;
D O I
10.1063/5.0054587
中图分类号
O59 [应用物理学];
学科分类号
摘要
Harnessing detachment of an aqueous droplet via electrowetting on a flat surface has been of considerable interest for potential practical applications, ranging from self-cleaning to novel optical and digital microfluidic devices, due to the wettability of the droplet on a solid substrate enhanced by applying an electric voltage between the droplet and the insulated substrate. However, a quantitative understanding of the detachment process and an accurate prediction on the thresholds of applied voltage for droplet detachment on curved surfaces are still lacking. In this paper, based on energy conservation, we derive a critical condition theoretically for electrowetting-induced droplet detachment from a hydrophobic curved surface. Furthermore, phase diagrams are constructed in terms of droplet volume, viscosity, the Ohnesorge number, friction coefficient at contact line, surface curvature, surface wettability, and electrowetting number. The deduced critical condition offers a general and quantitative prediction on when the detachment occurs, a criterion enabling us to gain more insights into how to accurately manipulate the electrowetting-induced detachment of an aqueous droplet on a curved surface. The results obtained in this paper also imply that the detachable regimes of the phase diagrams can be enlarged through increasing droplet volume and surface curvature and reducing liquid viscosity, friction coefficient, the Ohnesorge number, and wettability of substrates.
引用
收藏
页数:10
相关论文
共 50 条
  • [21] Electrowetting-induced photochemical surface modification onto fluorocarbon
    Anai, Hiroyuki
    Sato, Yuji
    Murahara, Masataka
    [J]. SURFACE ENGINEERING FOR MANUFACTURING APPLICATIONS, 2006, 890 : 229 - +
  • [22] Accelerated chemical reactions for lab-on-a-chip applications using electrowetting-induced droplet self-oscillations
    Aizenberg, Joanna
    Krupenkin, Tom
    Kolodner, Paul
    [J]. NANOSTRUCTURED MATERIALS AND HYBRID COMPOSITES FOR GAS SENSORS AND BIOMEDICAL APPLICATIONS, 2006, 915 : 103 - +
  • [23] Electrowetting-induced capillary flow in a parallel-plate channel
    Chen, JH
    Hsieh, WH
    [J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2006, 296 (01) : 276 - 283
  • [24] Analytical prediction of electrowetting-induced jumping motion for droplets on hydrophobic substrates
    Zhang, Kaixuan
    Li, Zhen
    Chen, Shuo
    [J]. PHYSICS OF FLUIDS, 2019, 31 (08)
  • [25] Dynamics of droplet motion induced by Electrowetting
    Lu, Yi
    Sur, Aritra
    Pascente, Carmen
    Annapragada, S. Ravi
    Ruchhoeft, Paul
    Liu, Dong
    [J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2017, 106 : 920 - 931
  • [26] DYNAMICS OF DROPLET MOTION INDUCED BY ELECTROWETTING
    Lu, Yi
    Sur, Aritra
    Liu, Dong
    Pascente, Carmen
    Ruchhoeft, Paul
    [J]. PROCEEDINGS OF THE ASME SUMMER HEAT TRANSFER CONFERENCE, 2016, VOL 1, 2016,
  • [27] Influence of surfactant on electrowetting-induced surface electrocoalescence of water droplets in hydrocarbon media
    Lokanathan, Manojkumar
    Wimalarathne, Sarith
    Bahadur, Vaibhav
    [J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2022, 642
  • [28] Numerical analysis of droplet detachment from hydrophobic surfaces during electrowetting
    Nayak, Sagar G.
    Banerjee, Jyotirmay
    [J]. Multiphase Science and Technology, 2021, 33 (01) : 19 - 40
  • [29] Dynamics of droplet transport induced by electrowetting actuation
    Baviere, Roland
    Boutet, Jerome
    Fouillet, Yves
    [J]. MICROFLUIDICS AND NANOFLUIDICS, 2008, 4 (04) : 287 - 294
  • [30] Dynamics of droplet transport induced by electrowetting actuation
    Roland Bavière
    Jérôme Boutet
    Yves Fouillet
    [J]. Microfluidics and Nanofluidics, 2008, 4 : 287 - 294