On evaporation dynamics of an acoustically levitated multicomponent droplet: Evaporation-triggered phase transition and freezing

Zeng, Hao; Wakata, Yuki; Chao, Xing; Li, Mingbo; Sun, Chao

doi:10.1016/j.jcis.2023.06.012

Journal of Colloid and Interface Science

2023

DOI: 10.1016/j.jcis.2023.06.012

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On evaporation dynamics of an acoustically levitated multicomponent droplet: Evaporation-triggered phase transition and freezing

Hao Zeng

Yuki Wakata

Xing Chao

et al.

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Cited by 6 publications

References 61 publications

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Self-lubricating drops

Tan,

Lohse,

Zhang

2023

Current Opinion in Colloid & Interface Science

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Self-lubricating drops

Tan,

Lohse,

Zhang

2023

Current Opinion in Colloid & Interface Science

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Evaporation of acoustically levitated bicomponent droplets: mass and heat transfer characteristics

Wakata,

Chao,

Sun

et al. 2024

J. Fluid Mech.

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Evaporation of multicomponent droplets is important, albeit complex, in a wide range of applications, and requires a careful investigation. We investigate experimentally and numerically the evaporation characteristics of spherical, ethanol–water droplets with different initial concentration ratios in the acoustic levitation field. Imaging techniques and infrared thermometry are used for acquiring volume and surface temperature variations of droplets, reflecting their mass and heat transfer characteristics. Numerical simulations are conducted using modified parameters based on a theoretical model to consider the effect of the acoustic field. The calculation results show good agreement with the experimental data. The concentration and temperature distribution within the droplet is further investigated based on the numerical results.

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Airborne Ouzo: Evaporation-induced emulsification and phase separation dynamics of ternary droplets in acoustic levitation

Mitsuno,

Hasegawa

2024

Physics of Fluids

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We experimentally investigated the evaporation dynamics of acoustically levitated Ouzo droplets (a mixture of ethanol, water, and anise oil). Acoustic levitation has gained significant attention in various fields owing to its potential to create a lab-in-a-drop. Although evaporation is a key process in nature and industry, many studies have focused on single and binary components, and ternary droplets in acoustic levitation have rarely been experimentally investigated. In this study, the evaporation-induced spontaneous emulsification (the Ouzo effect) and phase separation process at 40–90 vol. % ethanol were visualized. We estimated the concentration change by evaporation of each component in the levitated ternary droplets based on an evaporation model to determine the experimental results. Our experimental results revealed four distinct stages of evaporation in levitated Ouzo droplets: (1) preferential evaporation of the volatile component (ethanol), (2) spontaneous emulsification (myriad micro-oil droplets generation), (3) phase separation forming a core–shell droplet, and (4) water evaporation completion resulting in the remaining oil droplets. Finally, we analyzed the emulsification process using a spacetime diagram. These findings suggest that acoustic levitation is suitable for physicochemical manipulation in mid-air.

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On evaporation dynamics of an acoustically levitated multicomponent droplet: Evaporation-triggered phase transition and freezing

Cited by 6 publications

References 61 publications

Self-lubricating drops

Self-lubricating drops

Evaporation of acoustically levitated bicomponent droplets: mass and heat transfer characteristics

Airborne Ouzo: Evaporation-induced emulsification and phase separation dynamics of ternary droplets in acoustic levitation

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