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  Competing Marangoni and Rayleigh convection in evaporating binary droplets

Diddens, C., Li, Y., & Lohse, D. (2021). Competing Marangoni and Rayleigh convection in evaporating binary droplets. Journal of Fluid Mechanics, 914: A23. doi:10.1017/jfm.2020.734.

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 Creators:
Diddens, Christian, Author
Li, Yaxing, Author
Lohse, Detlef1, Author              
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: For a small sessile or pendant droplet it is generally assumed that gravity does not play any role once the Bond number is small. This is even assumed for evaporating binary sessile or pendant droplets, in which convective flows can be driven due to selective evaporation of one component and the resulting concentration and thus surface tension differences at the air–liquid interface. However, recent studies have shown that in such droplets gravity indeed can play a role and that natural convection can be the dominant driving mechanism for the flow inside evaporating binary droplets (Edwards et al., Phys. Rev. Lett., vol. 121, 2018, 184501; Li et al., Phys. Rev. Lett., vol. 122, 2019, 114501). In this study, we derive and validate a quasi-stationary model for the flow inside evaporating binary sessile and pendant droplets, which successfully allows one to predict the prevalence and the intriguing interaction of Rayleigh and/or Marangoni convection on the basis of a phase diagram for the flow field expressed in terms of the Rayleigh and Marangoni numbers.

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Language(s): eng - English
 Dates: 2021-03-052021
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1017/jfm.2020.734
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Title: Journal of Fluid Mechanics
Source Genre: Journal
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Pages: 26 Volume / Issue: 914 Sequence Number: A23 Start / End Page: - Identifier: ISSN: 0022-1120
ISSN: 1469-7645