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Related Concept Videos

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Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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Boiling Point Elevation
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
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Air humidity effects on water-drop icing.

Julien Sebilleau1, Emeryk Ablonet1, Philippe Tordjeman1

  • 1Institut de Mécanique des Fluides de Toulouse (IMFT), Université de Toulouse, CNRS, INPT, UPS, Toulouse 31400, France.

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Summary

Atmospheric humidity significantly impacts water droplet icing by inducing phase changes and altering heat transfer. This affects icing speed and shape, as confirmed by experiments and a modified Stefan model.

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Area of Science:

  • Physics of Fluids
  • Thermodynamics
  • Materials Science

Background:

  • The icing of water droplets on cold surfaces is a common phenomenon with implications in various fields.
  • Previous models often overlook the influence of ambient atmospheric conditions on the icing process.

Purpose of the Study:

  • To investigate the effect of atmospheric conditions, specifically air humidity, on the kinetics of the icing front and the formation of ice tips.
  • To develop and validate a theoretical model that incorporates humidity effects for droplet icing.

Main Methods:

  • Experimental observation of water droplet icing on a cold substrate under controlled humidity.
  • Theoretical modeling using a modified Stefan model that accounts for humidity-induced phase changes and heat transfer.

Main Results:

  • Air humidity was found to induce significant liquid-vapor phase change at the droplet interface.
  • The associated heat transfer strongly influences both the speed of the icing front and the final shape of the iced drop, including tip formation.
  • The modified Stefan model showed good agreement with experimental data for front kinetics and tip angle.

Conclusions:

  • Atmospheric humidity is a critical factor in water droplet icing dynamics.
  • A humidity-inclusive Stefan model accurately predicts experimental observations of icing kinetics and morphology.
  • Understanding these effects is crucial for applications involving freezing phenomena.