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  Gravitational effect in evaporating binary microdroplets

Li, Y., Diddens, C., Lv, P., Wijshoff, H., Versluis, M., & Lohse, D. (2019). Gravitational effect in evaporating binary microdroplets. Physical Review Letters, 122(11): 114501. doi:10.1103/PhysRevLett.122.114501.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-4B05-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-4B06-3
Genre: Journal Article

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Li, Y., Author
Diddens, C., Author
Lv, P., Author
Wijshoff, H., Author
Versluis, M., Author
Lohse, Detlef1, Author              
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: The flow in an evaporating glycerol-water binary submillimeter droplet with a Bond number Bo << 1 is studied both experimentally and numerically. First, we measure the flow fields near the substrate by microparticle image velocimetry for both sessile and pendant droplets during the evaporation process, which surprisingly show opposite radial flow directions-inward and outward, respectively. This observation clearly reveals that in spite of the small droplet size, gravitational effects play a crucial role in controlling the flow fields in the evaporating droplets. We theoretically analyze that this gravity-driven effect is triggered by the lower volatility of glycerol which leads to a preferential evaporation of water then the local concentration difference of the two components leads to a density gradient that drives the convective flow. We show that the Archimedes number Ar is the nondimensional control parameter for the occurrence of the gravitational effects. We confirm our hypothesis by experimentally comparing two evaporating microdroplet systems, namely, a glycerol-water droplet and a 1,2-propanediol-water droplet. We obtain different Ar, larger or smaller than a unit by varying a series of droplet heights, which corresponds to cases with or without gravitational effects, respectively. Finally, we simulate the process numerically, finding good agreement with the experimental results and again confirming our interpretation.

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Language(s): eng - English
 Dates: 2019-03-182019
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.122.114501
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Title: Physical Review Letters
Source Genre: Journal
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Pages: 6 Volume / Issue: 122 (11) Sequence Number: 114501 Start / End Page: - Identifier: -