|
|
自然蒸发下固着双液滴内部流动的二维数值模拟
|
Abstract:
针对目前热门的固着双液滴蒸发的实验研究，采用有限元方法建立了二维固着双液滴蒸发模型，并将模拟结果与实验进行比较，模拟了不同液滴分离度及液滴接触角情况下的固着双液滴蒸发过程。结果表明：双液滴的初始间距越小，对液滴之间的蒸发抑制越强烈，且单侧液滴呈现非对称状态，其靠近对称中心的一侧受蒸发抑制明显，而另一侧影响较小，并且随着蒸发的进行，液滴间的抑制作用逐渐下降；不同接触角对固着双液滴蒸发也有影响，接触角越大，对固着双液滴的蒸发抑制越明显。
Aiming at the current popular experimental research on sessile double-droplet evaporation, a two-dimensional sessile double-droplet evaporation model was established by finite element method, and the simulation results were compared with experiments to simulate the sessile double droplets evaporation process under different droplet separation degrees and droplet contact angles. The results show that the smaller the initial distance between the double droplets, the stronger the inhibition of the evaporation of the droplets between the droplets, and the one-sided droplets are asymmetrical. The side close to the center of symmetry is significantly inhibited by evaporation, while the other side has little influence, and the inhibition between droplets decreases gradually with the progress of evaporation. Different contact angles also affect the evaporation of sessile double droplets; the larger the contact angle is, the more obvious the inhibition of evaporation is.
| [1] | Fenwick, E. and Maxwell, J.C. (2009) A Bibliography of James Clerk Maxwell, Part 1. Esward Fenwick, Edinburgh. |
| [2] | Sreznevsky, B.I. (1882) About Evaporation of Liquids. Journal of the Russian Physical Chemistry Society, ZhRFKhO, 14, No. 8. |
| [3] | Langmuir, I. (1918) The Evaporation of Small Spheres. Physical Review Journals Archive, 12, 368-370.
https://doi.org/10.1103/PhysRev.12.368 |
| [4] | Topley, B. and Whytlaw-Gray, R. (1927) Experiments on the Rate of Evaporation of Small Spheres as a Method of Determining Diffusion Coefficients. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 4, 873-888. https://doi.org/10.1080/14786441108564392 |
| [5] | Mangel Jr., R.F. and Baer, E. (1962) The Evaporation of Water Drops from a “Teflon” Surface. Chemical Engineering Science, 17, 705-706. https://doi.org/10.1016/0009-2509(62)85029-5 |
| [6] | Picknett, R.G. and Bexon, R. (1977) Evaporation of Sessile or Pendant Drops in Still Air. Journal of Colloid & Interface Science, 61, 336-350. https://doi.org/10.1016/0021-9797(77)90396-4 |
| [7] | Shanahan, M.E.R. and Bourgès, C. (1994) Effects of Evaporation on Contact Angles on Polymer Surfaces. International Journal of Adhesion and Adhesives, 14, 201-205. https://doi.org/10.1016/0143-7496(94)90031-0 |
| [8] | Bourges-Monnier, C. and Shanahan, M.E.R. (1995) Influence of Evaporation on Contact Angle. Langmuir, 11, 2820-2829. https://doi.org/10.1021/la00007a076 |
| [9] | McHale, G., Aqil, S., Shirtcliffe, N.J., et al. (2005) Analysis of Droplet Evaporation on a Superhydrophobic Surface. Langmuir, 21, 11053-11060. https://doi.org/10.1021/la0518795 |
| [10] | Erbil, H.Y., McHale, G. and Newton, M.I. (2002) Drop Evaporation on Solid Surfaces: Constant Contact Angle Mode. Langmuir, 18, 2636-2641. https://doi.org/10.1021/la011470p |
| [11] | 饶玲, 单彦广, 汪建兴. 极坐标下Marangoni应力对静止液滴蒸发过程的影响[J]. 工程热物理学报, 2017, 38(2): 289-295. |
| [12] | Laghezza, G., Dietrich, E., Yeomans, J.M., et al. (2016) Collective and Convective Effects Compete in Patterns of Dissolving Surface Droplets. Soft Matter, 12, 5787-5796. https://doi.org/10.1039/C6SM00767H |
| [13] | Shaikeea, A.J.D. and Basu, S. (2016) Evaporating Sessile Droplet Pair: Insights into Contact Line Motion, Flow Transitions and Emergence of Universal Vaporisation Pattern. Applied Physics Letters, 108, Article ID: 244102.
https://doi.org/10.1063/1.4953836 |
| [14] | Bansal, L., Hatte, S., Basu, S. and Chakraborty, S. (2017) Universal Evaporation Dynamics of a Confined Sessile Droplet. Applied Physics Letters, 111, Article ID: 101601. https://doi.org/10.1063/1.4996986 |
| [15] | Hatte, S., Dhar, R., Bansal, L., et al. (2019) On the Lifetime of Evaporating Confined Sessile Droplets. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 560, 78-83. https://doi.org/10.1016/j.colsurfa.2018.10.008 |
| [16] | Carrier, O., Shahidzadeh-Bonn, N., Zargar, R., et al. (2016) Evaporation of Water: Evaporation Rate and Collective Effects. Journal of Fluid Mechanics, 798, 774-786. https://doi.org/10.1017/jfm.2016.356 |
| [17] | Wray, A.W., Duffy, B.R. and Wilson, S.K. (2020) Competitive Evaporation of Multiple Sessile Droplets. Journal of Fluid Mechanics, 884, A45. https://doi.org/10.1017/jfm.2019.919 |
| [18] | Khilifi, D., Foudhil, W., Fahem, K., et al. (2019) Study of the Phenomenon of the Interaction between Sessile Drops during Evaporation. Thermal Science, 23, 1105-1114. https://doi.org/10.2298/TSCI180406188K |
| [19] | Shaikeea, A.J.D. and Basu, S. (2016) Insight into the Evaporation Dynamics of a Pair of Sessile Droplets on a Hydrophobic Substrate. Langmuir, 32, 1309-1318. https://doi.org/10.1021/acs.langmuir.5b04570 |
