Dynamics and universal scaling law in geometrically-controlled sessile drop evaporation
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Dynamics and universal.pdf
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Author(s)
Wray, A. W.
Che, Z.
Matar, O. K.
Valluri, P.
Kim, J.
Sefiane, K.
Saenz Hervias, Pedro Javier
Date Issued
March 2017
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Sáenz, P. J.; Wray, A. W.; Che, Z.; Matar, O. K.; Valluri, P.; Kim, J. and Sefiane, K. “Dynamics and Universal Scaling Law in Geometrically-Controlled Sessile Drop Evaporation.” Nature Communications 8 (March 2017): 14783 © 2017 The Authors
Version
Final published version
Abstract
The evaporation of a liquid drop on a solid substrate is a remarkably common phenomenon. Yet, the complexity of the underlying mechanisms has constrained previous studies to spherically symmetric configurations. Here we investigate well-defined, non-spherical evaporating drops of pure liquids and binary mixtures. We deduce a universal scaling law for the evaporation rate valid for any shape and demonstrate that more curved regions lead to preferential localized depositions in particle-laden drops. Furthermore, geometry induces well-defined flow structures within the drop that change according to the driving mechanism. In the case of binary mixtures, geometry dictates the spatial segregation of the more volatile component as it is depleted. Our results suggest that the drop geometry can be exploited to prescribe the particle deposition and evaporative dynamics of pure drops and the mixing characteristics of multicomponent drops, which may be of interest to a wide range of industrial and scientific applications.
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/ncomms14783
