The impact and freezing processes of a water droplet on a cold surface with different inclined angles

Jin, Zheyan; Zhang, Huanhuan; Yang, Zhigang

doi:10.1016/j.ijheatmasstransfer.2016.08.012

Cited by 66 publications

(25 citation statements)

References 18 publications

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“…As the nucleation time increases, the overflow distance of droplet will increase as well. When the nucleation time of droplet is longer than its retraction time 0.05 s (shown as the dotted line), the droplet will freeze as the form of two smaller droplets, which is consistent with the results of Jin [20], and the overflow distance will be longer.…”

Section: The Freezing Law Of Supercooled Droplet Impinging On Inclinesupporting

confidence: 85%

“…The results show that the increase of droplet size leads to the increase of spreading time, spreading maximum diameter, gliding maximum diameter and maximum displacement of foremost point [19]. The inclined angle of surface was found to have an apparent influence on the spreading time, and the water droplet would split into two smaller droplets once the inclined angle of the surface was high enough (e.g., 60.0 • ) [20]. However, the coupling of water flow and phase change is not considered in their research.…”

Section: Introductionmentioning

confidence: 94%

“…Jin et al [19,20] experimentally investigated the impact and freezing processes of a water droplet on different inclined surfaces and surfaces with different inclined angles. The results show that the increase of droplet size leads to the increase of spreading time, spreading maximum diameter, gliding maximum diameter and maximum displacement of foremost point [19].…”

Section: Introductionmentioning

confidence: 99%

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Effect of nucleation and icing evolution on run-back freezing of supercooled water droplet

Sun

Kong

Wang

et al. 2019

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Supercooled large droplet (SLD), which can cause run-back ridged ice, will affect the aerodynamic performance of aircraft and poses a serious threat to aircraft safety. However, there is little knowledge about the abnormal run-back icing mechanism, which is vital for the development of aircraft anti-icing technologies. The flow and freezing of supercooled droplet impinging on inclined surface can help us better understand the run-back icing of SLD, especially the coupling of water flow and phase change in the freezing process. This paper experimentally investigates the freezing behavior of supercooled water droplet impinging on inclined surface. By observing the processes of water flow, ice formation and growth with a high-speed camera, the overflow distance and the freezing time are recorded with different temperatures. Different from previous discoveries that droplet freezes as the form of two smaller droplets on an inclined surface, we found two new frozen morphologies under the condition of short nucleation time: ellipse and slender strip, when the supercooling is high and low, respectively. The overflow distance and freezing time will increase with the decrease of ice growth rate, when supercooling decreases. And the freezing time will increase dramatically when the supercooling is low enough. Finally, the mechanism of run-back freezing of droplet based on the nucleation and icing evolution is discussed. Droplet impact on the inclined surface will result in large overflow distance when it nucleates after its retraction stage.

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Section: The Freezing Law Of Supercooled Droplet Impinging On Inclinesupporting

confidence: 85%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of nucleation and icing evolution on run-back freezing of supercooled water droplet

Sun

Kong

Wang

et al. 2019

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“…Previous research has identified a number of factors important to the freezing process such as the temperature of the cooling surface, T p [1], the size of the droplet [2] the impact of free and forced convection [3,4], the roughness and wettability of a surface [5], the freezing on superhydrophobic surfaces, e.g. [6], the effect of an inclined surface [7][8][9], internal heat transfer [10,11] and internal flow [12]. A number of studies have also experimentally shown that the contact angle, θ, has a strong influence on the water droplet freezing time, t f [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Modelling the dynamics of the flow within freezing water droplets

2018

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The flow within freezing water droplets is here numerically modelled assuming fixed shape throughout freezing. Three droplets are studied with equal volume but different contact angles and two cases are considered, one including internal natural convection and one where it is excluded, i.e. a case where the effects of density differences is not considered. The shape of the freezing front is similar to experimental observations in the literature and the freezing time is well predicted for colder substrate temperatures. The latter is found to be clearly dependent on the plate temperature and contact angle. Including density differences has only a minor influence on the freezing time, but it has a considerable effect on the dynamics of the internal flow. To exemplify, in the vicinity of the density maximum for water (4 • C) the velocities are about 100 times higher when internal natural convection is considered for as compared to when it is not.

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“…The schematic of the current experimental setup is shown in Fig. 2, which is similar to that in our previous studies [13][14][15][16][17]. During the experiment, the test surface was cooled down to a subfreezing temperature by a constant temperature bath circulator (AC150-A25, Thermo Scientific).…”

Section: Methodsmentioning

confidence: 99%

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

Jin

Zhang

et al. 2018

Experimental Thermal and Fluid Science

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The impact and freezing processes of a water droplet on a cold surface with different inclined angles

Cited by 66 publications

References 18 publications

Effect of nucleation and icing evolution on run-back freezing of supercooled water droplet

Effect of nucleation and icing evolution on run-back freezing of supercooled water droplet

Modelling the dynamics of the flow within freezing water droplets

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

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