Density-driven flows in evaporating binary liquid droplets

Edwards, A.M.J. ORCID: 0000-0003-3338-1287, Atkinson, P.S., Cheung, C.S., Liang, H. ORCID: 0000-0001-9496-406X, Fairhurst, D.J. ORCID: 0000-0001-5311-0762 and Ouali, F.F. ORCID: 0000-0002-6530-6786, 2018. Density-driven flows in evaporating binary liquid droplets. Physical Review Letters, 121 (18): 184501. ISSN 0031-9007

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Abstract

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.

Item Type: Journal article
Publication Title: Physical Review Letters
Creators: Edwards, A.M.J., Atkinson, P.S., Cheung, C.S., Liang, H., Fairhurst, D.J. and Ouali, F.F.
Publisher: American Physical Society
Date: 2 November 2018
Volume: 121
Number: 18
ISSN: 0031-9007
Identifiers:
NumberType
10.1103/physrevlett.121.184501DOI
Rights: © 2018 American Physical Society.
Divisions: Schools > School of Science and Technology
Depositing User: Linda Sullivan
Date Added: 12 Nov 2018 14:17
Last Modified: 15 May 2019 13:22
URI: http://irep.ntu.ac.uk/id/eprint/34918

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