Cooperative evaporation in two-dimensional droplet arrays.,Physical Review E

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Cooperative evaporation in two-dimensional droplet arrays.
Physical Review E ( IF 2.2 ) Pub Date : 2020-04-01 , DOI: 10.1103/physreve.101.043101
Khushboo Pandey ₁ , Sandeep Hatte ₂ , Keshav Pandey ₃ , Suman Chakraborty ₄ , Saptarshi Basu _{1,

3}

Affiliation

The evaporation of a sessile drop in a gaseous environment may be critical to many practical applications. Evaporation dynamics of interacting sessile droplets is strongly influenced by the proximity of adjacent droplets. We study the effects of droplet-droplet vapor-mediated interactions on the evaporation lifetime of two-dimensional arrays of sessile water droplets. We observe that the presence of neighboring droplets acts as a mode of vapor accumulation which slows down the evaporation process. By considering an arbitrarily configured two-dimensional array of droplets, here we provide a simple generalized theoretical limit to their lifetime in an evaporating state. Using a scaling analysis, we put forward that the sessile droplet lifetime in a two-dimensional array is a linear function of the extent of confinement for various surface wettability and droplet geometric parameters (contact angle and contact radius). Notwithstanding the geometrical and physical complexity of the effective confinement generated due to their cooperative interactions, we show that the consequent evaporation characteristics may be remarkably insensitive to the topographical details of the overall droplet organization for a wide range of droplet-substrate combinations. With subsequent deployment of particle-laden droplets, however, our results lead to the discovery of a unique pathway towards tailoring the internal flows within the collective system by harnessing an exclusive topologically driven symmetry-breaking phenomenon, yielding a strategy of patterning particulate matters around the droplet array.

中文翻译：

二维液滴阵列中的合作蒸发。

固着液滴在气态环境中的蒸发对于许多实际应用而言可能至关重要。相互作用的无柄小滴的蒸发动力学受相邻小滴的接近程度的强烈影响。我们研究了液滴-液滴蒸气介导的相互作用对二维阵列无柄水滴的蒸发寿命的影响。我们观察到相邻液滴的存在是蒸气积聚的一种方式，这会减慢蒸发过程。通过考虑液滴的任意配置的二维阵列，在这里我们为在蒸发状态下的寿命提供了一个简单的广义理论极限。使用缩放分析，我们提出二维阵列中的无柄液滴寿命是各种表面润湿性和液滴几何参数（接触角和接触半径）的约束程度的线性函数。尽管由于它们的协作相互作用而产生了有效限制的几何和物理复杂性，但我们表明，对于广泛的液滴-基质组合，因此产生的蒸发特性可能对总体液滴组织的形貌细节非常不敏感。但是，随着随后布满粒子的液滴的部署，我们的结果导致发现了一种独特的途径，该途径可以利用专有的拓扑驱动的对称破坏现象来调整集合系统内的内部流，

更新日期：2020-04-03

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