External Flow Structure and Interfacial Transport Phenomena of an Acoustically Levitated Droplet

Goda, Atsushi; Hasegawa, Koji; Kaneko, Akiko; Kanagawa, Tetsuya; Abe, Yutaka

doi:10.3811/jjmf.28.539

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…Furthermore, in recent years, non-contact manipulation by using an ultrasonic phased array has also been investigated, thereby expanding the application of the ALM for non-contact manipulation. 21,22 However, the use of the ALM leads to the introduction of nonlinear dynamics on a levitated droplet, such as in the form of acoustic streaming [23][24][25][26][27][28] and dynamic behavior, 29,30 owing to the levitation of the sample by a nonlinear acoustic eld. These phenomena may affect the evaporation and precipitation of the levitated samples.…”

Section: Introductionmentioning

confidence: 99%

Evaporation and drying kinetics of water-NaCl droplets via acoustic levitation

Maruyama

Hasegawa

2020

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Evaporation and drying kinetics of water-NaCl droplets via acoustic levitation

Maruyama

Hasegawa

2020

RSC Adv.

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“…We applied PTV to measure the flow velocity in the vicinity of the droplet and the thickness of the vortex. 29,43 Figure 3 shows the outline of the measurement. In Figs.…”

Section: B Velocity and Vortex Thickness Measurement Methodsmentioning

confidence: 99%

“…We previously conducted experiments to understand the interaction between acoustic streaming and evaporation of a levitated droplet. 43,44 We clarified that both internal and external flows depend on the saturated vapor pressure of a levitated droplet. Therefore, it is vital to obtain the volatile sample concentration near the external surface of a levitated droplet.…”

Section: Introductionmentioning

confidence: 99%

Flow structure and evaporation behavior of an acoustically levitated droplet

et al. 2018

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We experimentally investigate the flow structure and evaporation behavior of a droplet in an ∼19 kHz single-axis acoustic levitator. Decane, nonane, octane, heptane, hexane, and pentane are used as test fluids to investigate the effect of saturated vapor pressure on the internal and external flow fields. Under low saturated vapor pressure (decane and nonane), the direction of the external flow is away from the surface of the droplet. However, at a relatively higher saturated vapor pressure (octane, heptane, hexane, and pentane), the direction of the external flow is toward the surface of the droplet, with vortices forming near the droplet surface. For droplets with a low saturated vapor pressure (decane, nonane, octane, and heptane), the internal flow is similar to that in the case of rigid body rotation. Finally, under high saturated vapor pressure (hexane and pentane), the internal flow is an unsteady 3D complex flow. The experimental results indicate that the vapor concentration distribution around a levitated droplet surface correlates closely with changes in the external and internal flows.

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Microlayered flow structure around an acoustically levitated droplet under a phase-change process

2016

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The acoustic levitation method (ALM) has found extensive applications in the fields of materials science, analytical chemistry, and biomedicine. This paper describes an experimental investigation of a levitated droplet in a 19.4-kHz single-axis acoustic levitator. We used water, ethanol, water/ethanol mixture, and hexane as test samples to investigate the effect of saturated vapor pressure on the flow field and evaporation process using a high-speed camera. In the case of ethanol, water/ethanol mixtures with initial ethanol fractions of 50 and 70 wt%, and hexane droplets, microlayered toroidal vortexes are generated in the vicinity of the droplet interface. Experimental results indicate the presence of two stages in the evaporation process of ethanol and binary mixture droplets for ethanol content >10%. The internal and external flow fields of the acoustically levitated droplet of pure and binary mixtures are clearly observed. The binary mixture of the levitated droplet shows the interaction between the configurations of the internal and external flow fields of the droplet and the concentration of the volatile fluid. Our findings can contribute to the further development of existing theoretical prediction.

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External Flow Structure and Interfacial Transport Phenomena of an Acoustically Levitated Droplet

Cited by 10 publications

References 8 publications

Evaporation and drying kinetics of water-NaCl droplets via acoustic levitation

Evaporation and drying kinetics of water-NaCl droplets via acoustic levitation

Flow structure and evaporation behavior of an acoustically levitated droplet

Microlayered flow structure around an acoustically levitated droplet under a phase-change process

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