The impact and freezing processes of a water droplet on different cold spherical surfaces

Ju, Jiajun; Jin, Zheyan; Zhang, Huanhuan; Yang, Zhigang; Zhang, Jian

doi:10.1016/j.expthermflusci.2018.03.037

Cited by 39 publications

(8 citation statements)

References 38 publications

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“…The freezing process of a water droplet has been the topic of comprehensive research [1], specifically areas such as visual study of freezing [2][3][4][5][6][7][8], singular tip [9][10][11][12][13], impact onto a surface [14][15][16][17][18][19] and tri-junction condition [20]. The research has concluded some important factors that affect the freezing process.…”

Section: Introductionmentioning

confidence: 99%

Influence of Substrate Material on Flow in Freezing Water Droplets—An Experimental Study

Fagerström

Ljung

Karlsson

et al. 2021

Water

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Freezing water droplets are a natural phenomenon that occurs regularly in the Arctic climate. It affects areas such as aircrafts, wind turbine blades and roads, where it can be a safety issue. To further scrutinize the freezing process, the main objective of this paper is to experimentally examine the influence of substrate material on the internal flow of a water droplet. The secondary goal is to reduce uncertainties in the freezing process by decreasing the randomness of the droplet size and form by introducing a groove in the substrate material. Copper, aluminium and steel was chosen due to their differences in thermal conductivities. Measurements were performed with Particle Image Velociometry (PIV) to be able to analyse the velocity field inside the droplet during the freezing process. During the investigation for the secondary goal, it could be seen that by introducing a groove in the substrate material, the contact radius could be controlled with a standard deviation of 0.85%. For the main objective, the velocity profile was investigated during different stages of the freezing process. Five points along the symmetry line of the droplet were compared and copper, which also has the highest thermal conductivity, showed the highest internal velocity. The difference between aluminium and steel was in their turn more difficult to distinguish, since the maximum velocity switched between the two materials along the symmetry line.

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Section: Introductionmentioning

confidence: 99%

Influence of Substrate Material on Flow in Freezing Water Droplets—An Experimental Study

Fagerström

Ljung

Karlsson

et al. 2021

Water

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“…The impact and freezing process of water droplets on different spherical cold surfaces are experimentally studied. Ju et al [33] found that the diffusion factor of a low-temperature surface was larger than that of a normal temperature surface. Due to the effect of cold carrier particles, the liquid-solid interface was first formed at the bottom of the water droplets.…”

Section: Freezing Process Of Single Droplet Impacting On Spherical Su...mentioning

confidence: 99%

Spray Freezing Coating on the Carrier Particles for Powder Preparation

Wang

Zhang

et al. 2022

Coatings

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Carrier particle spray freeze-drying is a new technology with high added value for thermosensitive powder spray freeze-drying. The technology includes the following steps: atomization, coating, freezing, and drying. Due to the action of carrier particles, the condensation of frozen droplets in the conventional spray freeze-drying process is overcome. However, there are many influencing factors involved in the process of freezing coating. The mechanism of the complex droplet collision freezing process still needs to be studied. In this paper, from the perspective of spray freezing coating after atomized droplets collide with low-temperature carrier particles, the coating process and freezing process of single droplets impacting the sphere are analyzed microscopically. The freezing coating processes of static and dynamic carrier particles are reviewed. Moreover, the surface evaluation of powder and equipment development for creating powder products is discussed.

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“…The authors monitored the water drops with the variable wetting angle in the range of 77º -145º. Zhang et al [8] and Ju et al [9] did experiments on solidification of water drops on different curved surfaces. Investigating the growth angle, Satunkin [10] used molten Silicon, Germanium and Indium antimonide solidified on a cold plate.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of the solidification process of a retracting fluid filament

Pham

Nguyen

et al. 2021

Vietnam J. Mech.

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In this study, the retraction and solidification of a fluid filament are studied by a front-tracking method/finite difference scheme. The interface between two phases is handled by connected points (Lagrangian grid), which move on a fixed grid domain (Eulerian grid). The Navier-Stokes and energy equations are solved to simulate the problem. Initially, the fluid filament has a shape as half of a cylindrical capsule contact with a cold flat surface. We consider the effect of the aspect ratio (Ar) on the solidification of the fluid filament. It is found that an increase in the aspect ratio (Ar) in the range of 2 – 14 causes the retraction length to increase. The rate of the solidification of a fluid filament decreases when the Ar ratio increases. The solidification time, the solidification height and the tip angle of the fluid filament under the influence of the aspect ratio are also considered. After complete solidification, a small protrusion on the top of the solidified fluid filament is found.

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The impact and freezing processes of a water droplet on different cold spherical surfaces

Cited by 39 publications

References 38 publications

Influence of Substrate Material on Flow in Freezing Water Droplets—An Experimental Study

Influence of Substrate Material on Flow in Freezing Water Droplets—An Experimental Study

Spray Freezing Coating on the Carrier Particles for Powder Preparation

A numerical study of the solidification process of a retracting fluid filament

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