Observation of ice nucleation in acoustically levitated water drops

Lü, Yongjun; Xie, Wenjie; Wei, B.

doi:10.1063/1.2126801

Cited by 34 publications

(34 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the hypothesis of Tabazadeh et al [29] appears plausible. In some cases surface nucleation was observed even with large droplets acoustically levitated [40] [50], but in this case the sound intensity affects the nucleation process. Evidence in support of the assumption of Tabazadeh et al [29] comes from computer simulations, that show a tendency for nucleation at or near the surface in fluid clusters.…”

Section: Discussionmentioning

confidence: 99%

“…Lü et al [40] also investigated the nucleation of acoustically levitated water drops, finding that ice nucleation is mainly confined to the surface. In this case, the acoustic streaming around the water drop improves the heat transfer between the levitated drop and its surrounding medium, and as a result a low-temperature region is developed near the drop surface.…”

Section: Reported Datamentioning

confidence: 99%

See 1 more Smart Citation

Does the Homogeneous Ice Nucleation Initiate in the Bulk Volume or at the Surface of Super-Cooled Water Droplets? A Review

Santachiara¹,

Belosi²

2014

ACS

View full text Add to dashboard Cite

The formation of ice in clouds can occur through primary processes, either homogeneously or heterogeneously triggered by aerosol particles called ice nuclei, as well as through secondary processes. The homogeneous ice nucleation process involves only pure water or solution droplets. Homogeneous freezing is crucial for the microphysics in the formation of high-altitude cirrus and polar stratospheric clouds, and also in the glaciation of thunderclouds, at temperatures below about 235 K. Nucleation rates in supercooled water have been measured using different experimental techniques: expansion cloud chambers, water-in-oil emulsions, levitation methods, free falling droplets, supersonic nozzles, field measurements, and molecular dynamics simulations. An important question concerns the possibility that the nucleation process in supercooled water can occur not only in the interior volume of the droplet, but even at or close to its surface. Even if there is no conclusive evidence, the majority of experimental and theoretical results suggest that the contribution of surface nucleation increases with decreasing radius of the supercooled droplets, and the surface (or sub-surface) nucleation rate is prevalent for droplets with radius lower than about 5 μm. If homogeneous freezing initiates at the droplet surface, the freezing rate should depend on the droplet size, and even a slight contamination by molecules within the surface layer could hamper the rate of the nucleation process.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Reported Datamentioning

confidence: 99%

Does the Homogeneous Ice Nucleation Initiate in the Bulk Volume or at the Surface of Super-Cooled Water Droplets? A Review

Santachiara¹,

Belosi²

2014

ACS

View full text Add to dashboard Cite

show abstract

“…Here, p m is the minimum pressure needed to levitate the droplet, and p M is the maximum pressure needed to ensure the droplet stability [14,17]. For Al-27%Cu-5.3%Si ternary alloy, p m and p M are 0.8×10 4 and 1.8×10 4 Pa, respectively. From the deformation of the alloy sample, the sound pressure amplitude was derived using eq.…”

Section: Droplet Deformation Mechanismmentioning

confidence: 99%

“…Previously, the containerless melting and solidification of low-melting point materials, such as Bi-Ga and Pb-Sn alloys, were performed using the single-axis acoustic levitation technique [3][4][5]. In this paper, we have extended the application of single-axis acoustic levitation to the containerless processing of an Al-27%Cu-5.3%Si ternary alloy, which has a higher melting point than alloys that have been investigated previously [10].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Rapid solidification of acoustically levitated Al-Cu-Si eutectic alloy under laser irradiation

et al. 2011

View full text Add to dashboard Cite

Al-27%Cu-5.3%Si ternary eutectic alloy was melted using a YAG laser and then solidified while being acoustically levitated. A maximum undercooling to 195 K (0.24 T L ) was achieved with a cooling rate of 76 K/s. The solidification microstructure was composed of (Al+θ+Si) ternary eutectics and (Al+θ) pseudobinary eutectics. During acoustic levitation, the (Al+θ+Si) ternary eutectics are refined and the (Al+θ) pseudobinary eutectics have morphological diversity. On the surface of the alloys, surface oscillations and acoustic streaming promote the nucleation of the three eutectic phases and expedite the cooling process. This results in the refinement of the ternary eutectic microstructure. During experiments, the reflector decreases with increasing alloy temperature, and the levitation distance always exceeds the resonant distance. Because of the acoustic radiation pressure, the melted alloy was flattened, and deformation increases with increasing sound pressure. The maximum aspect ratio achieved was 6.64, corresponding to a sound pressure of 1.8×10 4 Pa.

show abstract

Extraordinary Solidification Mechanism of Liquid Alloys Under Acoustic Levitation State

et al. 2022

View full text Add to dashboard Cite

The acoustic levitation of various materials can be realized by highly intensive ultrasound, which provides a free surface and containerless state for materials processing under space simulation conditions. The nonlinear effects such as acoustic radiation pressure, acoustic streaming, and ultrasonic cavitation open up special access to modulate the fluid dynamics and solidification mechanisms of liquid materials. Here, the physical characteristics of liquid flow, undercooling capability, phase separation, and crystal nucleation and growth within acoustically levitated droplets are explored comprehensively to reveal the extraordinary solidification kinetics of liquid alloys. The sectorial shape oscillations of the 2nd to 10th order modes accompanying internal potential flow are observed for water droplets with modulated ultrasound amplitudes, while the enhanced ultrasound intensity promotes ice nucleation and thus reduces water undercooling. The migration of Sn‐rich globules during phase separation of immiscible Al–Cu–Sn alloy is dominated by the droplet deformation and rotation related to acoustic levitation. The high undercooling states of liquid Ag–Cu–Ge and Ni–Sn alloys during acoustic levitation result in the refinement of (Ag) dendrites and the formation of anomalous (Ni+Ni3Sn) eutectics. The ultrasound–liquid interaction also induces surface waves during the containerless solidification of Ag–Cu and Ni–Sn eutectic alloys.

show abstract

Observation of ice nucleation in acoustically levitated water drops

Cited by 34 publications

References 18 publications

Does the Homogeneous Ice Nucleation Initiate in the Bulk Volume or at the Surface of Super-Cooled Water Droplets? A Review

Does the Homogeneous Ice Nucleation Initiate in the Bulk Volume or at the Surface of Super-Cooled Water Droplets? A Review

Rapid solidification of acoustically levitated Al-Cu-Si eutectic alloy under laser irradiation

Extraordinary Solidification Mechanism of Liquid Alloys Under Acoustic Levitation State

Contact Info

Product

Resources

About