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arXiv 2103.07221physics.flu-dyncond-mat.soft
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多个蒸发液滴的接触线沉积

Contact-line deposits from multiple evaporating droplets

Alexander W. Wray, Patrick S. Wray, Brian R. Duffy, Stephen K. Wilson

摘要:

基于Wray,Duffy和Wilson [J. Fluid Mech.884,A45(2020)]关于彼此接近的多个薄固着液滴的竞争性扩散限制蒸发的最新理论工作,我们获得了接触线沉积物空间非均匀密度的理论预测在这种含有悬浮固体颗粒的液滴完全蒸发之后,残留在基材上的咖啡污渍(通常称为“咖啡污渍”或“环污渍”)。相邻的液滴通过它们的蒸汽场相互作用,这导致空间上不均匀的“屏蔽”效应。我们给出了来自一对相同液滴的沉积物的预测,这表明在液滴最靠近的地方沉积物减少得最多,并且证明了与Pradhan和Panigrahi [Coll. Surf. A 482,562-567(2015)]。我们也给出了相应的预测,三个相同的液滴排列在一个等边三角形,这表明在这种情况下,对沉积物的屏蔽效果是更加微妙的。

英文摘要:

Building on the recent theoretical work of Wray, Duffy and Wilson [J. Fluid Mech. 884, A45 (2020)] concerning the competitive diffusion-limited evaporation of multiple thin sessile droplets in proximity to each other, we obtain theoretical predictions for the spatially non-uniform densities of the contact-line deposits (often referred to as "coffee stains" or "ring stains") left on the substrate after such droplets containing suspended solid particles have completely evaporated. Neighbouring droplets interact via their vapour fields, which results in a spatially non-uniform "shielding" effect. We give predictions for the deposits from a pair of identical droplets, which show that the deposit is reduced the most where the droplets are closest together, and demonstrate excellent quantitative agreement with experimental results of Pradhan and Panigrahi [Coll. Surf. A 482, 562-567 (2015)]. We also give corresponding predictions for a triplet of identical droplets arranged in an equilateral triangle, which show that the effect of shielding on the deposit is more subtle in this case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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