Impeding effect on droplet spreading by a groove on the substrate
Abstract view|88|times PDF download|29|times
Abstract
Understanding the wetting behaviors of droplets on grooved surfaces is indispensable in surface science and offers promising avenues for advancing industrial processes. The droplet spreading on grooved surfaces can be discretized into a series of individual events that the droplet across each groove with variations in capillary forces and a subsequent re-equilibrium. In this work, a simplified model of droplet spreading on surface with an individual groove on both the left and right sides was utilized in order to elucidate the fundamental mechanisms underlying contact line pinning due to the groove. We examined the effects of the groove position and the wettability of solid surfaces. The contact line is observed to be pinned when the grooves are strategically positioned. However, by reducing the distance between the grooves, the contact lines can cross them. In such instances, the spreading process can be classified into four modes: Free spreading, impeding spreading, pinning, and depinning. The pinning and depinning phenomenon are explained by the balance between the driving force and pinning force on the contact line. Based on simulation results, the maximum pinning force exerted on the contact line by a certain solid surface can be theoretically predicted. Besides, the wettability of the solid surface also contributes to the impeding effect. This work provides theoretical guidance for the study of wetting on grooved surfaces at the nanoscale, which is essential for developing a comprehensive understanding of the interactions between droplets and structured surfaces, with potential applications in optimizing industrial processes and advancing surface science.
Document Type: Original article
Cited as: Huang, X., Li, Y. Q., Fan, J. C., Wu, H. A., Wang, F. C. Impeding effect on droplet spreading by a groove on the substrate. Capillarity, 2024, 13(1): 1-9. https://doi.org/10.46690/capi.2024.10.01
Keywords
Full Text:
PDFReferences
Blake, T. D. The physics of moving wetting lines. Journal of Colloid and Interface Science, 2006, 299(1): 1-13.
Bonn, D., Eggers, J., Indekeu, J., et al. Wetting and spreading. Reviews of Modern Physics, 2009, 81(2): 739-805.
Cai, J., Chen, Y., Liu, Y., et al. Capillary imbibition and flow of wetting liquid in irregular capillaries: A 100-year review. Advances in Colloid and Interface Science, 2022, 304: 102654.
Cai, J., Jin, T., Kou, J., et al. Lucas-Washburn equation-based modeling of capillary-driven flow in porous systems. Langmuir, 2021, 37(5): 1623-1636.
Cherukupally, P., Sun, W., Williams, D. R., et al. Wax-wetting sponges for oil droplets recovery from frigid waters. Science Advances, 2021, 7(11): eabc7926.
De Gennes, P. G., Brochard-Wyart, F., Quéré, D. Capillarity and Wetting Phenomena: Drops, Bubbles, Pearls, Waves. New York, USA, Springer, 2004.
Ding, Y., Jia, L., Yin, L., et al. Anisotropic wetting characteristics of droplet on micro-grooved surface. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2022, 633: 127850.
Fan, J., De Coninck, J., Wu, H., et al. Microscopic origin of capillary force balance at contact line. Physical Review Letters, 2020, 124(12): 125502.
Fan, J., De Coninck, J., Wu, H., et al. A generalized examination of capillary force balance at contact line: On rough surfaces or in two-liquid systems. Journal of Colloid and Interface Science, 2021, 585: 320-327.
Gao, L., McCarthy, T. J. How Wenzel and Cassie were wrong. Langmuir, 2007, 23(7): 3762-3765.
Huang, X., Fan, J., Wu, H., et al. Local molecular asymmetry mediated self-adaptive pinning force on the contact line. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2023, 674: 131987.
Ingebrigtsen, T., Toxvaerd, S. Contact angles of Lennard-Jones liquids and droplets on planar surfaces. The Journal of Physical Chemistry C, 2007, 111(24): 8518-8523.
Liu, F., Wang, M. Trapping patterns during capillary displacements in disordered media. Journal of Fluid Mechanics, 2022, 933: A52.
Liu, Y., Wang, J., Zhang, X., et al. Contact line pinning and the relationship between nanobubbles and substrates. The Journal of Chemical Physics, 2014, 140(5): 054705.
Lukyanov, A. V. Non-locality of the contact line in dynamic wetting phenomena. Journal of Colloid and Interface Science, 2022, 608: 2131-2141.
Paxson, A. T., Varanasi, K. K. Self-similarity of contact line depinning from textured surfaces. Nature Communications, 2013, 4(1): 1492.
Perrin, H., Lhermerout, R., Davitt, K., et al. Defects at the nanoscale impact contact line motion at all scales. Physical Review Letters, 2016, 116(18): 184502.
Plimpton, S. Fast parallel algorithms for short-range molecular dynamics. Journal of Computational Physics, 1995, 117(1): 1-19.
Putnam, S. A., Briones, A. M., Byrd, L. W., et al. Microdroplet evaporation on superheated surfaces. International Journal of Heat and Mass Transfer, 2012, 55(21-22): 5793-5807.
Qi, B., Zhou, J., Wei, J., et al. Study on the wettability and condensation heat transfer of sine-shaped micro-grooved surfaces. Experimental Thermal and Fluid Science, 2018, 90: 28-36.
Ruckenstein, E., Berim, G. O. Microscopic description of a drop on a solid surface. Advances in Colloid and Interface Science, 2010, 157(1-2): 1-33.
Sarshar, M. A., Jiang, Y., Xu, W., et al. Depinning force of a receding droplet on pillared superhydrophobic surfaces: Analytical models. Journal of Colloid and Interface Science, 2019, 543: 122-129.
Seveno, D., Blake, T. D., De Coninck, J. Young’s equation at the nanoscale. Physical Review Letters, 2013, 111(9): 096101.
Teshima, H., Nishiyama, T., Takahashi, K. Nanoscale pinning effect evaluated from deformed nanobubbles. The Journal of Chemical Physics, 2017, 146(1): 014708.
Wang, F., Qian, J., Fan, J., et al. Molecular transport under extreme confinement. Science China Physcis, Mechanics & Astronomy, 2022a, 65(6): 264601.
Wang, Y., Li, Z., Elhebeary, M., et al. Water as a “glue”: Elasticity-enhanced wet attachment of biomimetic microcup structures. Science Advances, 2022b, 8(12): eabm9341.
Wang, S., Wang, T., Ge, P., et al. Controlling flow behavior of water in microfluidics with a chemically patterned anisotropic wetting surface. Langmuir, 2015, 31(13): 4032-4039.
White, E. B., Schmucker, J. A. Wind-and gravity-forced drop depinning. Physical Review Fluids, 2021, 6(2): 023601.
Xu, W., Lan, Z., Peng, B., et al. Directional movement of droplets in grooves: Suspended or immersed?. Scientific Reports, 2016, 6(1): 18836.
Yada, S., Allais, B., Wijngaart, W., et al. Droplet impact on surfaces with asymmetric microscopic features. Langmuir, 2021, 37(36): 10849-10858.
Yang, J., Rose, F. R., Gadegaard, N., et al. Effect of sessile drop volume on the wetting anisotropy observed on grooved surfaces. Langmuir, 2009, 25(5): 2567-2571.
Zarzar, L. D., Sresht, V., Sletten, E. M., et al. Dynamically reconfigurable complex emulsions via tunable interfacial tensions. Nature, 2015, 518(7540): 520-524.
Zhang, J., Ding, W., Hampel, U. How droplets pin on solid surface. Journal of Colloid and Interface Science, 2023, 640: 940-948.
Zhang, J., Müller-Plathe, F., Leroy, F. Pinning of the contact line during evaporation on heterogeneous surfaces: Slowdown or temporary immobilization? Insights from a nanoscale study. Langmuir, 2015, 31(27): 7544-7552.
Zhao, B., MacMinn, C. W., Juanes, R. Wettability control on multiphase flow in patterned microfluidics. Proceedings of the National Academy of Sciences, 2016, 113(37): 10251-10256.
Zhao, Y. Moving contact line problem: Advances and perspectives. Theoretical and Applied Mechanics Letters, 2014, 4(3): 034002.
Refbacks
- There are currently no refbacks.
Copyright (c) 2024 The Author(s)
![Creative Commons License](http://licensebuttons.net/l/by-nc-nd/4.0/88x31.png)
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.