Experiments in acoustic levitation - Surface tension measurements of deformed droplets

Bayazıtoğlu, Yıldız; Mitchell, Garrick F.

doi:10.2514/3.726

Cited by 30 publications

(14 citation statements)

References 14 publications

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“…As shown for EML also for AL droplet shape will have an impact on thermophysical property measurements as discussed in Ref. 13 as might have the interaction of the levitation force with the sample driving fluid-flow inside of the sample. 14,36 Different to the other techniques AL also enables to measure viscosities exceeding 10 2 Pa s exciting forced rotation in the sample as demonstrated by Ohsaka et al 15 However, this technique relies on a relaxation model to interpret the measured data.…”

Section: Introductionmentioning

confidence: 98%

“…Containerless handling of liquids can provide unique solutions. Indeed, measurements of thermophysical properties using contactless liquid processing methods have been successfully carried out employing electromagnetic levitation (EML), 1-5 electrostatic levitation (ESL), [6][7][8] to a less extent gas-film levitation (GFL) [9][10][11] and acoustic levitation (AL) with the sample contained by a surrounding liquid 12 or freely suspended in a gaseous environment, [13][14][15] and very recently also conical-nozzle aerodynamic levitation (ADL). 16 this is only possible in a controlled way under microgravity conditions.…”

Section: Introductionmentioning

confidence: 99%

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Aerodynamic levitator furnace for measuring thermophysical properties of refractory liquids

Langstaff¹,

Gunn²,

Greaves³

et al. 2013

Review of Scientific Instruments

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The development of novel contactless aerodynamic laser heated levitation techniques is reported that enable thermophysical properties of refractory liquids to be measured in situ in the solid, liquid, and supercooled liquid state and demonstrated here for alumina. Starting with polished crystalline ruby spheres, we show how, by accurately measuring the changing radius, the known density in the solid state can be reproduced from room temperature to the melting point at 2323 K. Once molten, by coupling the floating liquid drop to acoustic oscillations via the levitating gas, the mechanical resonance and damping of the liquid can be measured precisely with high-speed high-resolution shadow cast imaging. The resonance frequency relates to the surface tension, the decay constant to the viscosity, and the ellipsoidal size and shape of the levitating drop to the density. This unique instrumentation enables these related thermophysical properties to be recorded in situ over the entire liquid and supercooled range of alumina, from the boiling point at 3240 K, until spontaneous crystallization occurs around 1860 K, almost 500 below the melting point. We believe that the utility that this unique instrumentation provides will be applicable to studying these important properties in many other high temperature liquids.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Aerodynamic levitator furnace for measuring thermophysical properties of refractory liquids

Langstaff¹,

Gunn²,

Greaves³

et al. 2013

Review of Scientific Instruments

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“…Single-axis acoustic levitators typically use a sound emitter and reflector, which are usually aligned parallel to the gravity direction and hence block the observation of the levitated objects from top and bottom 18 . In such levitators, liquid droplets are often flattened into disc-like shapes 19 and rapidly atomizatized 43 . The dynamic behavior of particles in a Bessel shaped field are not simple as unlike the microfluidic cases considers to date 27 mass and inertia play an important role.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of levitated objects in acoustic vortex fields

Hong

Yin

Zhai

et al. 2017

Sci Rep

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Acoustic levitation in gaseous media provides a tool to process solid and liquid materials without the presence of surfaces such as container walls and hence has been used widely in chemical analysis, high-temperature processing, drop dynamics and bioreactors. To date high-density objects can only be acoustically levitated in simple standing-wave fields. Here we demonstrate the ability of a small number of peripherally placed sources to generate acoustic vortex fields and stably levitate a wide range of liquid and solid objects. The forces exerted by these acoustic vortex fields on a levitated water droplet are observed to cause a controllable deformation of the droplet and/or oscillation along the vortex axis. Orbital angular momentum transfer is also shown to rotate a levitated object rapidly and the rate of rotation can be controlled by the source amplitude. We expect this research can increase the diversity of acoustic levitation and expand the application of acoustic vortices.

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“…Extensive studies have also been performed on evaporation [37,38] and drying [39] of acoustically levitated droplets.…”

Section: Acoustic Levitationmentioning

confidence: 99%

Airborne chemistry: acoustic levitation in chemical analysis

Santesson

Nilsson

2004

Analytical and Bioanalytical Chemistry

220

116

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This review with 60 references describes a unique path to miniaturisation, that is, the use of acoustic levitation in analytical and bioanalytical chemistry applications. Levitation of small volumes of sample by means of a levitation technique can be used as a way to avoid solid walls around the sample, thus circumventing the main problem of miniaturisation, the unfavourable surface-to-volume ratio. Different techniques for sample levitation have been developed and improved. Of the levitation techniques described, acoustic or ultrasonic levitation fulfils all requirements for analytical chemistry applications. This technique has previously been used to study properties of molten materials and the equilibrium shape()and stability of liquid drops. Temperature and mass transfer in levitated drops have also been described, as have crystallisation and microgravity applications. The airborne analytical system described here is equipped with different and exchangeable remote detection systems. The levitated drops are normally in the 100 nL-2 microL volume range and additions to the levitated drop can be made in the pL-volume range. The use of levitated drops in analytical and bioanalytical chemistry offers several benefits. Several remote detection systems are compatible with acoustic levitation, including fluorescence imaging detection, right angle light scattering, Raman spectroscopy, and X-ray diffraction. Applications include liquid/liquid extractions, solvent exchange, analyte enrichment, single-cell analysis, cell-cell communication studies, precipitation screening of proteins to establish nucleation conditions, and crystallisation of proteins and pharmaceuticals.

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Experiments in acoustic levitation - Surface tension measurements of deformed droplets

Cited by 30 publications

References 14 publications

Aerodynamic levitator furnace for measuring thermophysical properties of refractory liquids

Aerodynamic levitator furnace for measuring thermophysical properties of refractory liquids

Dynamics of levitated objects in acoustic vortex fields

Airborne chemistry: acoustic levitation in chemical analysis

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