Cooperative evaporation in two-dimensional droplet arrays

Pandey, K and Hatte, S and Pandey, K and Chakraborty, S and Basu, S (2020) Cooperative evaporation in two-dimensional droplet arrays. In: Physical Review E, 101 (4).

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Abstract

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.

Item Type:	Journal Article
Publication:	Physical Review E
Publisher:	AMER PHYSICAL SOC
Additional Information:	The copyright of this article belongs to AMER PHYSICAL SOC
Keywords:	Contact angle; Evaporation, Cooperative interactions; Effective confinements; Evaporation process; Gaseous environments; Mediated interaction; Physical complexity; Surface wettability; Two-dimensional arrays, Drop formation
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	12 Aug 2020 16:59
Last Modified:	12 Aug 2020 16:59
URI:	http://eprints.iisc.ac.in/id/eprint/65495

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