Interferometric measurement of co-operative evaporation in 2D droplet arrays

Edwards, AMJ ORCID: https://orcid.org/0000-0003-3338-1287, Cater, J, Kilbride, JJ ORCID: https://orcid.org/0000-0002-3699-6079, Le Minter, P, Brown, CV ORCID: https://orcid.org/0000-0002-1559-3238, Fairhurst, DJ ORCID: https://orcid.org/0000-0001-5311-0762 and Ouali, FF ORCID: https://orcid.org/0000-0002-6530-6786, 2021. Interferometric measurement of co-operative evaporation in 2D droplet arrays. Applied Physics Letters, 119 (15): 151601. ISSN 0003-6951

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Abstract

The evaporation dynamics of multiple droplet arrays is important in inkjet printing and spray coating, where co-operative “shielding” effects increase the overall evaporation time. However, current measurement methods provide limited information on how individual droplets contribute to the overall dynamics. In this work, we present a simple interferometric technique for precise measurements of droplet evaporation rates, which is not possible via traditional approaches. We validate the technique on a single droplet. We then extend our analysis to ordered and random 2D arrays of droplets. We demonstrate that the evaporation rate is highly dependent on the position of the droplet within the array and its confinement. The more confined droplets exhibit lower evaporation rates. Our results of ten different configurations and well over 100 droplets are in good quantitative agreement with a recent analytical model of co-operative evaporation rates. Our approach opens up possibilities for studies of collective evaporation effects, including in areas of current importance such as sneezes and exhaled breath.

Item Type:	Journal article
Publication Title:	Applied Physics Letters
Creators:	Edwards, A.M.J., Cater, J., Kilbride, J.J., Le Minter, P., Brown, C.V., Fairhurst, D.J. and Ouali, F.F.
Publisher:	AIP Publishing
Date:	12 October 2021
Volume:	119
Number:	15
ISSN:	0003-6951
Identifiers:	Number Type 10.1063/5.0064924 DOI 1485319 Other
Rights:	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Edwards, A. M. J., Cater, J., Kilbride, J. J., Le Minter, P., Brown, C. V., Fairhurst, D. J., & Ouali, F. F. (2021). Interferometric measurement of co-operative evaporation in 2D droplet arrays. Applied Physics Letters, 119(15), 151601 and may be found at https://doi.org/10.1063/5.0064924
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	19 Nov 2021 14:17
Last Modified:	19 Nov 2021 14:17
URI:	https://irep.ntu.ac.uk/id/eprint/44888

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