Density-Driven Flows in Evaporating Binary Liquid Droplets

A.M.J. Edwards, P.S. Atkinson, C.S. Cheung, H. Liang, D.J. Fairhurst, F.F. Ouali

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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.
Original languageEnglish
Article number184501
Pages (from-to)1-5
Number of pages5
JournalPhysical Review Letters
Volume121
Issue number18
DOIs
Publication statusPublished - 1 Nov 2018

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