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Soft Matter Vol - 13 Issue - 4

Soft Matter Vol - 13 Issue - 3

Soft Matter Vol - 13 Issue - 2

Confinement-induced alterations in the evaporation dynamics of sessile droplets

Content Provider	Royal Society of Chemistry (RSC)
Author	Chakraborty, Suman Basu, Saptarshi Bansal, Lalit
Copyright Year	2017
Abstract	Evaporation of sessile droplets has been a topic of extensive research. However, the effect of confinement on the underlying dynamics has not been well explored. Here, we report the evaporation dynamics of a sessile droplet in a confined fluidic environment. Our findings reveal that an increase in the channel length delays the completion of the evaporation process and leads to unique spatio-temporal evaporation flux and internal flow. The evaporation modes (constant contact angle and constant contact radius) during the droplet lifetime however exhibit global similarity when normalized by appropriate length and timescales. These results are explained in light of an increase in vapor concentration inside the channel due to greater accumulation of water vapor on account of increased channel length. We have formulated a theoretical framework which introduces two key parameters namely an enhanced concentration of the vapor field in the vicinity of the confined droplet and a corresponding accumulation lengthscale over which the accumulated vapor relaxes to the ambient concentration. Using these two parameters and modified diffusion based evaporation we are able to show that confined droplets exhibit a universal behavior in terms of the temporal evolution of each evaporation mode irrespective of the channel length. These results may turn out to be of profound importance in a wide variety of applications, ranging from surface patterning to microfluidic technology.
Starting Page	969
Ending Page	977
Page Count	9
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	13
Issue Number	5
Journal	Soft Matter
DOI	10.1039/c6sm02429g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Constant Contact Leaf Diffusion
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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