自然蒸发下固着双液滴内部流动的二维数值模拟

Two-Dimensional Numerical Simulation of Internal Flow of Sessile Double Droplets under Natural Evaporation

摘要: 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。

Abstract: 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.