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Evaporating pure, binary and ternary droplets: thermal effects and axial symmetry breaking

  • Christian Diddens (a1) (a2), Huanshu Tan (a1), Pengyu Lv (a1), Michel Versluis (a1), J. G. M. Kuerten (a2) (a3), Xuehua Zhang (a1) (a4) and Detlef Lohse (a1) (a5)...
Abstract

The Greek aperitif Ouzo is not only famous for its specific anise-flavoured taste, but also for its ability to turn from a transparent miscible liquid to a milky-white coloured emulsion when water is added. Recently, it has been shown that this so-called Ouzo effect, i.e. the spontaneous emulsification of oil microdroplets, can also be triggered by the preferential evaporation of ethanol in an evaporating sessile Ouzo drop, leading to an amazingly rich drying process with multiple phase transitions (Tan et al., Proc. Natl Acad. Sci. USA, vol. 113 (31), 2016, pp. 8642–8647). Due to the enhanced evaporation near the contact line, the nucleation of oil droplets starts at the rim which results in an oil ring encircling the drop. Furthermore, the oil droplets are advected through the Ouzo drop by a fast solutal Marangoni flow. In this article, we investigate the evaporation of mixture droplets in more detail, by successively increasing the mixture complexity from pure water over a binary water–ethanol mixture to the ternary Ouzo mixture (water, ethanol and anise oil). In particular, axisymmetric and full three-dimensional finite element method simulations have been performed on these droplets to discuss thermal effects and the complicated flow in the droplet driven by an interplay of preferential evaporation, evaporative cooling and solutal and thermal Marangoni flow. By using image analysis techniques and micro-particle-image-velocimetry measurements, we are able to compare the numerically predicted volume evolutions and velocity fields with experimental data. The Ouzo droplet is furthermore investigated by confocal microscopy. It is shown that the oil ring predominantly emerges due to coalescence.

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Corresponding author
Email addresses for correspondence: c.diddens@utwente.nl, d.lohse@utwente.nl
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Type Description Title
VIDEO
Movies

Diddens et al. supplementary movie
Flow in the ternary Ouzo droplet by visualizing the oil microdroplets via confocal microscopy (figure 11)

 Video (67.5 MB)
67.5 MB
VIDEO
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Diddens et al. supplementary movie
Simulation of the ternary Ouzo droplet (figure 6)

 Video (70.3 MB)
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Diddens et al. supplementary movie
Behavior of the oil microdroplets at the rim and on the substrate by confocal microscopy (figure 12)

 Video (71.0 MB)
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Diddens et al. supplementary movie
Ethanol concentration at the interface and velocity near the substrate in the water-ethanol droplet obtained by numerical simulation (figure 8, figure 9(g-l))

 Video (88.8 MB)
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Diddens et al. supplementary movie
Velocity in the water-ethanol droplet obtained by the micro-PIV technique (figure 9(a-f))

 Video (70.7 MB)
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Diddens et al. supplementary movie
Simulation of the binary water-ethanol droplet (figure 4)

 Video (48.4 MB)
48.4 MB
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Movies

Diddens et al. supplementary movie
Simulation of the pure water droplet (figure 3)

 Video (25.5 MB)
25.5 MB

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