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Leidenfrost droplet Demonstration of the Leidenfrost effect Leidenfrost effect of a single drop of water. 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.
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 ...
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.
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.
Evaporation is a phase transition from the liquid phase to vapor (a state of substance below critical temperature) that occurs at temperatures below the boiling temperature at a given pressure. Evaporation occurs on the surface. Evaporation only occurs when the partial pressure of vapor of a substance is less than the equilibrium vapor pressure ...
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Thermodynamic surface; Specific to weather services, there are mainly three different types of thermodynamic diagrams used: Skew-T log-P diagram; Tephigram; Emagram; All three diagrams are derived from the physical P–alpha diagram which combines pressure (P) and specific volume (alpha) as its basic coordinates.
The temperature at which the Leidenfrost effect occurs depends fairly strongly on a number of properties of both the surface and the liquid. This may include (but is not limited to) surface roughness, contamination in the liquid, and the amount of wetting between the surface and the non-suspended liquid.