Three scenarios of freezing of liquid marbles

Starostin, Anton; Стрельников, В. Н.; Dombrovsky, Leonid A.; Shoval, Shraga; Bormashenko, Edward

doi:10.1016/j.colsurfa.2021.128125

Cited by 6 publications

(9 citation statements)

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“…The word "thermal" is not occasional here because the thermal contact is greater than the mechanical contact is. The point is that the thermal resistance of a thin gas gap between the droplet and the substrate is very small and, as shown for the same working cell 24 , does not prevent heat removal from the marble or water droplet. Of course, the change in values of 𝜌𝑐 and 𝑘 at the moving ice-water interface is taken into account.…”

Section: Resultsmentioning

confidence: 86%

“…Most likely, the resulting contribution of the natural convection to the combined heat transfer in the water layer in the droplet is insignificant. This assumption has been already used in modeling of the liquid marble freezing 24 . A comparison of the calculated and measured freezing times for marbles of the same size as the water droplets in this study showed the validity of this assumption.…”

Section: Resultsmentioning

confidence: 99%

“…In the suggested approximate model for the droplet cooling, we assume that the above discussed asymmetry does not strongly affect the crystallization front motion in the droplet and the axisymmetric model can be used to estimate the velocity of the crystallization front. In addition, we consider a novel modified 1D heat conduction problem instead of the complicated 2D heat conduction calculations 24 .…”

Section: Resultsmentioning

confidence: 99%

“…According to ref. 24, the value of 𝑇 1 = 𝑇 * was used in the initial condition. The first of the boundary conditions (2b) takes into account a decrease of the surface temperature of the wedge during the droplet crystallization 26 .…”

Section: Resultsmentioning

confidence: 99%

“…The freezing tip shape demonstrates surprising insensitivity to the freezing conditions, the volume of the droplet, the temperature of the substrate and the cooling rate, and even to the coating of the droplet with oils or powders. 24,25 It might be mistakenly concluded that the vertical orientation of the geometrical axis of the freezing tip is dictated by gravity, which should impose the cylindrical symmetry of the frozen droplet. However, it was recently shown that the spatial orientation of the freezing tip depend mainly on the heat flux direction at the contact area of the droplet with the wedge surface.…”

Section: Introductionmentioning

confidence: 99%

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Effects of asymmetric cooling and surface wettability on the orientation of the freezing tip

Starostin

Стрельников

Dombrovsky

et al. 2024

Surface Innovations

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Freezing of water droplets placed on the bare and superhydrophobic surfaces of polymer wedges is studied both experimentally and computationally. Two-dimensional numerical calculations of the transient temperature field in a chilled polymer wedge show that the direction of heat flux from the droplet through the thermal contact region with the wedge differs significantly from the normal to the wedge surface. A novel approximate computational model is proposed that takes into account the variable area of the water freezing front in the droplet. This model gives a quantitative estimate of the faster freezing of the droplet on the bare surface. The obtained numerical results agree with the laboratory measurements. The velocity of the crystallization front and the droplet deformation including the so-called freezing tip formation are monitored in the experiment. The direction of the freezing cone axis appears to be noticeably different for the cases of bare and superhydrophobic wedge surfaces. This is explained by the fact that the direction of the freezing cone axis is controlled by the local direction of the heat flux. For a hydrophobic wedge surface, the deviation of the freezing tip from the vertical is smaller, because the reduced thermal contact area reduces the influence of the heat flux direction at the wedge surface.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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