Visualization Measurement of Streaming Flows Associated with a Single-Acoustic Levitator

Hasegawa, Koji; Abe, Yutaka; Kaneko, Akiko; Yamamoto, Yuji; Aoki, Kazuyoshi

doi:10.1007/s12217-009-9134-8

Cited by 33 publications

(16 citation statements)

References 8 publications

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“…One possible reason is that acoustic streaming, which is often observed in acoustic levitators with high sound intensity, 31,32 blows the particles along the surface. However, the direction of 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 13 center, 32 implying that acoustic streaming cannot account for the particle migration which is in the reverse direction.…”

Section: Particle Migration Mechanismmentioning

confidence: 99%

Switchable Opening and Closing of a Liquid Marble via Ultrasonic Levitation

Zang¹,

Li²,

Chen³

et al. 2015

Langmuir

109

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Liquid marbles have promising applications in the field of microreactors, where the opening and closing of their surfaces plays a central role. We have levitated liquid water marbles using an acoustic levitator and, thereby, achieved the manipulation of the particle shell in a controlled manner. Upon increasing the sound intensity, the stable levitated liquid marble changes from a quasi-sphere to a flattened ellipsoid. Interestingly, a cavity on the particle shell can be produced on the polar areas, which can be completely healed when decreasing the sound intensity, allowing it to serve as a microreactor. The integral of the acoustic radiation pressure on the part of the particle surface protruding into air is responsible for particle migration from the center of the liquid marble to the edge. Our results demonstrate that the opening and closing of the liquid marble particle shell can be conveniently achieved via acoustic levitation, opening up a new possibility to manipulate liquid marbles coated with non-ferromagnetic particles.

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Section: Particle Migration Mechanismmentioning

confidence: 99%

Switchable Opening and Closing of a Liquid Marble via Ultrasonic Levitation

Zang¹,

Li²,

Chen³

et al. 2015

Langmuir

109

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“…The external forces are mainly caused by acoustic streaming 34,35 and they cause spontaneous oscillations of the levitated particle. Due to the limitation of the experimental setup, the horizontal motion is analyzed by doing a projection on the x axis.…”

Section: Simple Model Of the Particle Oscillationsmentioning

confidence: 99%

“…34,35 Due to the high intensity sound field necessary for acoustic levitation, there is energy transfer from the fundamental frequency to high order harmonics. [27][28][29] The influence of higher order harmonics on the acoustic radiation force that acts on a sphere was analyzed by Leung et al 27 They verified experimentally that the acoustic radiation force agrees with the theory for low intensity sound fields.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the oscillation of spheres in an acoustic levitator

Andrade

Pérez²,

Adamowski

2014

The Journal of the Acoustical Society of America

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The spontaneous oscillation of solid spheres in a single-axis acoustic levitator is experimentally investigated by using a high speed camera to record the position of the levitated sphere as a function of time. The oscillations in the axial and radial directions are systematically studied by changing the sphere density and the acoustic pressure amplitude. In order to interpret the experimental results, a simple model based on a spring-mass system is applied in the analysis of the sphere oscillatory behavior. This model requires the knowledge of the acoustic pressure distribution, which was obtained numerically by using a linear finite element method (FEM). Additionally, the linear acoustic pressure distribution obtained by FEM was compared with that measured with a laser Doppler vibrometer. The comparison between numerical and experimental pressure distributions shows good agreement for low values of pressure amplitude. When the pressure amplitude is increased, the acoustic pressure distribution becomes nonlinear, producing harmonics of the fundamental frequency. The experimental results of the spheres oscillations for low pressure amplitudes are consistent with the results predicted by the simple model based on a spring-mass system.

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“…Although ALM enables highly precise manipulation using sound fields irrespective of sample properties 1 , nonlinear and unsteady phenomena (e.g., interfacial instability and atomisation 15 and acoustic streaming 17,18 ) emerge in droplet manipulation. Thus, the characteristics of single acoustic levitator were investigated in the last decades [19][20][21][22][23][24][25][26][27] . However, the dynamics of droplet manipulation via ultrasonic phased arrays have not been fully investigated.…”

mentioning

confidence: 99%

Acoustic Manipulation of Droplets under Reduced Gravity

Hasegawa

Watanabe

Abe

2019

Sci Rep

Self Cite

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contactless manipulation of matter is essential for studying physical phenomena. Acoustic manipulation of liquid samples using ultrasonic phased arrays provides a novel and attractive solution for mid-air manipulation, such as levitation, transportation, coalescence, mixing, separation, evaporation, and extraction, with a simple and single sequence. Despite the importance of gravity in droplet dynamics, its effect on a levitated droplet with an ultrasonic phased array remains unclear. to disseminate acoustic manipulation, better understanding of the fundamental physics of a droplet manipulated by ultrasonic phased arrays is required. Here, we show contactless levitation, transportation, and coalescence of multiple droplets under both ground and reduced gravity. Under ground gravity, the possible levitation size of the sample is limited to below the half wavelength of sound. Under reduced gravity, however, droplets that are larger than the limit can be successfully levitated, transported, and coalesced. furthermore, the threshold of sound pressure for droplet levitation and manipulation could be minimised with the suppression of nonlinear acoustic phenomena under reduced gravity. these insights promote the development of contactless manipulation techniques of droplets for future space experiment and inhabitancy.

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Visualization Measurement of Streaming Flows Associated with a Single-Acoustic Levitator

Cited by 33 publications

References 8 publications

Switchable Opening and Closing of a Liquid Marble via Ultrasonic Levitation

Switchable Opening and Closing of a Liquid Marble via Ultrasonic Levitation

Experimental study of the oscillation of spheres in an acoustic levitator

Acoustic Manipulation of Droplets under Reduced Gravity

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