Density-Driven Flows in Evaporating Binary Liquid Droplets

In the evaporation of microlitre liquid droplets, the accepted view is that surface tension dominates and the effect of gravity is negligible. We report, through the first use of rotating optical coherence tomography, that a change in the flow pattern and speed occurs when evaporating binary liquid...

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Bibliographic Details
Published in:	Physical review letters 2018-11, Vol.121 (18), p.184501-184501
Main Authors:	Edwards, A M J, Atkinson, P S, Cheung, C S, Liang, H, Fairhurst, D J, Ouali, F F
Format:	Article
Language:	eng
Subjects:	Droplets Gas chromatography Gravitational effects Optical Coherence Tomography Phase diagrams Silicon Surface tension
Online Access:	Get full text
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Summary:	In the evaporation of microlitre liquid droplets, the accepted view is that surface tension dominates and the effect of gravity is negligible. We report, through the first use of rotating optical coherence tomography, that a change in the flow pattern and speed occurs when evaporating binary liquid droplets are tilted, conclusively showing that gravitational effects dominate the flow. We use gas chromatography to show that these flows are solutal in nature, and we establish a flow phase diagram demonstrating the conditions under which different flow mechanisms occur.
ISSN:	0031-9007 1079-7114