A combined experimental and computational study of phase-change dynamics and flow inside a sessile water droplet freezing due to interfacial heat transfer

Voulgaropoulos, Victor; Kadivar, Mohammadreza; Moghimi, M.A.; Maher, Mohamed; Al-Awadi, Hameed; Matar, Omar; Markides, Christos N.

doi:10.1016/j.ijheatmasstransfer.2021.121803

Cited by 13 publications

(3 citation statements)

References 72 publications

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“…It was later shown in experimental work by Karlsson et al [13]- [14] that there is a directional change in the internal flow after a while. Voulgaropoulos et al [15] used another method in their experiments. Covering the droplet surface with oil, the freezing was initiated from the interface and inwards instead of from the substrate.…”

Section: Introductionmentioning

confidence: 99%

Influence of Contact Angle on the Internal Flow in a Freezing Water Droplet

Fagerström¹,

Ljung²

2022

Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering

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Ice accretion upon a surface is of interest in areas such as wind power, electric power transmission and vehicles in cold climate. Ice assimilation appears when humid air or water droplets impacts and freezes on a cold surface. In the study presented in this paper, droplets are deposited onto aluminium plates constructed to generate a specific contact angle between the droplet and substrate. Five contact angles are investigated and Particle Image Velocimetry (PIV) is used to analyse the internal flow. The droplets are studied along the vertical centerline and at horizontal lines at distances of 50% and 75% of the total height of the droplet. From the results it is found that a lower contact angle will increase the magnitude of the internal flow close to the edges. A larger contact angle will instead increase the magnitude of the flow in the center of the droplet. For a droplet with lower contact angle it was furthermore found that there is a triangular area inside the droplet with close to zero velocity.

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Section: Introductionmentioning

confidence: 99%

Influence of Contact Angle on the Internal Flow in a Freezing Water Droplet

Fagerström¹,

Ljung²

2022

Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering

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“…Marangoni like convection that drives the flow down along the water-air interface was also observed by Karlsson et al [34]. Another method to study the freezing of droplets was proposed by Voulgaropoulos et al [35] where the cooling was driven from the interface of oil/water instead of the surface on which the droplet rested. This type of cooling will make the freezing front start at the droplet interface and move inwards instead of bottom up.…”

Section: Introductionmentioning

confidence: 82%

Shape and Temperature Dependence on the Directional Velocity Change in a Freezing Water Droplet

Fagerström,

Ljung

2023

Preprint

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“…Cooling of water may be conducted in a container or on a substrate, which is one reason why heterogeneous nucleation of ice in supercooled water has been extensively studied. , Other related topics have also been investigated, such as dendritic growth, correlation of crystal growth of ice and the degree of supercooling, the effect of the contact line on the ice nucleation and the effect of surface roughness of substrates on freezing delay . Freezing kinetics inside a single water droplet have been studied both numerically and experimentally . The freezing of nanometer-sized confined water droplets has been studied at the microscale, confirming that soft interfaces suppress ice nucleation .…”

Section: Introductionmentioning

confidence: 99%

Propagation of Freezing in Supercooled Water-In-Antifreeze-Oil Emulsions

Komatsu,

Inasawa

2024

Langmuir

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Water-in-oil (W/O) emulsions, in which water droplets are separated by a continuous oil phase, are frequently used in food and cosmetic products. However, the freezing kinetics of W/O emulsions are not yet well understood. In this study, we find that freezing propagates to individual water droplets that are in direct contact with other frozen droplets. When droplets are not in contact, freezing does not propagate even when the emulsions are cooled to −18 °C. Two measures of the perimeter and the area of the frozen droplets in emulsions are defined to evaluate the propagation velocity of freezing using a simple mathematical model. The velocity is highest (4 × 10 2 μm s −1 ) at −18 °C, which is lower than the freezing velocity of individual droplets at the same temperature (1.2 × 10 3 μm s −1 ). Water−oil interfaces, or a thin layer of oil between droplets, act as a barrier to propagation of freezing. The dependence of the freezing velocity on the degree of supercooling is consistent with results from a previous study; however, the absolute value of the freezing velocity is smaller by a factor of 10 2 . The propagation velocity also depends on the degree of supercooling but its dependence is different from that of the freezing velocity. Features of freezing of water droplets immersed in antifreeze oil are discussed.

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A combined experimental and computational study of phase-change dynamics and flow inside a sessile water droplet freezing due to interfacial heat transfer

Cited by 13 publications

References 72 publications

Influence of Contact Angle on the Internal Flow in a Freezing Water Droplet

Influence of Contact Angle on the Internal Flow in a Freezing Water Droplet

Shape and Temperature Dependence on the Directional Velocity Change in a Freezing Water Droplet

Propagation of Freezing in Supercooled Water-In-Antifreeze-Oil Emulsions

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