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The Leidenfrost effect is a physical phenomenon in which a liquid, close to a solid surface of another body that is significantly hotter than the liquid's boiling point, produces an insulating vapor layer that keeps the liquid from boiling rapidly. Because of this repulsive force, a droplet hovers over the surface, rather than making physical ...
At extremes, film boiling commonly known as the Leidenfrost effect is observed. Boiling curve for water at 1atm. The process of forming steam bubbles within liquid in micro cavities adjacent to the wall if the wall temperature at the heat transfer surface rises above the saturation temperature while the bulk of the liquid (heat exchanger) is ...
Recently [timeframe?] in the field of chemistry, superfluid helium-4 has been successfully used in spectroscopic techniques as a quantum solvent.Referred to as superfluid helium droplet spectroscopy (SHeDS), it is of great interest in studies of gas molecules, as a single molecule solvated in a superfluid medium allows a molecule to have effective rotational freedom, allowing it to behave ...
Liquid nitrogen's efficiency as a coolant is limited by the fact that it boils immediately on contact with a warmer object, enveloping the object in an insulating layer of nitrogen gas bubbles. This effect, known as the Leidenfrost effect, occurs when any liquid comes in contact with a surface which is significantly hotter than its boiling point.
Superfluidity is the characteristic property of a fluid with zero viscosity which therefore flows without any loss of kinetic energy.When stirred, a superfluid forms vortices that continue to rotate indefinitely.
Effet_leidenfrost.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 11 s, 640 × 480 pixels, 1.42 Mbps overall, file size: 1.79 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
If no force acts normal to a tensioned surface, the surface must remain flat. But if the pressure on one side of the surface differs from pressure on the other side, the pressure difference times surface area results in a normal force. In order for the surface tension forces to cancel the force due to pressure, the surface must be curved.
At low pressures (including atmospheric pressure), the pressure dependence is mainly through the change in vapor density leading to an increase in the critical heat flux with pressure. However, as pressures approach the critical pressure, both the surface tension and the heat of vaporization converge to zero, making them the dominant sources of ...