Numerical and experimental investigation of the stability of a drop in a single-axis acoustic levitator

Andrade, Marco A. B.; Marzo, Asier

doi:10.1063/1.5121728

Cited by 30 publications

(14 citation statements)

References 72 publications

(108 reference statements)

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“…2 denote the time average over one cycle of acoustic oscillation. The first term represents the high acoustic pressure region exerting a positive pressure over the droplet surface, while the second term implies the Bernoulli effect representing the oscillation of the air particles exerting a negative pressure on the droplet ( 35 ). However, it is extremely difficult to determine F A exerted on the droplet because of the sensitivity of the twin trap ultrasonic field.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonic tweezer for multifunctional droplet manipulation

Yuan

Liu

et al. 2023

Sci. Adv.

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Spatiotemporally controllable droplet manipulation is essential in diverse applications, ranging from thermal management to microfluidics and water harvesting. Despite considerable advances, droplet manipulation without surface or droplet pretreatment is still challenging in terms of response and functional adaptability. Here, a droplet ultrasonic tweezer (DUT) based on phased array is proposed for versatile droplet manipulation. The DUT can generate a twin trap ultrasonic field at the focal point for trapping and maneuvering the droplet by changing the position of the focal point, which enables a highly flexible and precise programmable control. By leveraging the acoustic radiation force resulting from the twin trap, the droplet can pass through a confined slit 2.5 times smaller than its own size, cross a slope with an inclination up to 80°, and even reciprocate in the vertical direction. These findings provide a satisfactory paradigm for robust contactless droplet manipulation in various practical settings including droplet ballistic ejection, droplet dispensing, and surface cleaning.

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Section: Resultsmentioning

confidence: 99%

Ultrasonic tweezer for multifunctional droplet manipulation

Yuan

Liu

et al. 2023

Sci. Adv.

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“…1A, the droplet located in the standing wave will be levitated by the acoustic radiation force F rad , which can be defined by integrating the radiation pressure p rad over the droplet surface S . 60 where n is the normal unit vector pointing outward from the surface S , and the time-averaged radiation pressure p rad distribution over the droplet surface can be calculated bywhere ρ 0 is the unperturbed air density, c 0 is the speed of sound in air, p is the acoustic pressure, u is the medium particle velocity, and 〈〉 denotes the time-averaged value over one cycle. The time-averaged radiation pressure, as given by eqn (2), is dependent on two distinct terms.…”

Section: Resultsmentioning

confidence: 99%

Contactless acoustic tweezer for droplet manipulation on superhydrophobic surfaces

et al. 2023

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“…The technique of acoustic levitation can levitate almost any type of liquid without requiring the samples' electric/ magnetic properties. [13][14][15] This means it could provide contact-free manipulation and active stimulus to a wide range of materials, including complex fluids and soft matter. Owing to the inhibition of solid surfaces, acoustic levitation showed great potential for the investigation of the dynamics and physics of the liquid-air interfaces from interfacial rheology, and assembly to phase behaviors.…”

Section: Introductionmentioning

confidence: 99%

New insights into suspended drops: When soft matter meets acoustic levitation

Chen,

Hong,

Zang

2024

Droplet

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Acoustic levitation has developed into a popular but elegant tool for the study of drops as well as soft matter due to its exceptional levitation capabilities to a variety of liquid samples. The acoustically levitated drops offer opportunities for the investigation of a wide range of fundamental issues related to liquid drops. In this review, the unique physics/chemical processes involved in acoustically levitated drops are dealt with. We first introduce the dynamics of the acoustically levitated drops, including drop oscillation, coalescence, and the associated capillary phenomena. The bubble formation and stability are also discussed. Depending on the inhibition of solid surfaces and the nonlinear effects of ultrasound, the self‐assembly of colloidal particles at the air–liquid interface as well as granular matter in air is reviewed. In particular, the exploration of biological drops by using acoustic levitation is also highlighted. In the end, the concept of acoustic‐levitation‐fluidics and possible potential topics are proposed.

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Numerical and experimental investigation of the stability of a drop in a single-axis acoustic levitator

Cited by 30 publications

References 72 publications

Ultrasonic tweezer for multifunctional droplet manipulation

Ultrasonic tweezer for multifunctional droplet manipulation

Contactless acoustic tweezer for droplet manipulation on superhydrophobic surfaces

New insights into suspended drops: When soft matter meets acoustic levitation

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