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film boiling
(redirected from Leidenfrost effect)

    Also found in: Wikipedia 0.02 sec.
film boiling [′film ‚bȯil·iŋ]
(physical chemistry)
A stage in the boiling process in which the heater surface is totally covered by a film of vapor and the liquid does not contact the solid.
(thermodynamics)
Boiling in which a continuous film of vapor forms at the hot surface of the container holding the boiling liquid, reducing heat transfer across the surface.
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During quenching in water, for example, the water bath temperature, a heat transfer coefficient that takes into account the degree of agitation of the water bath (higher values for more agitation) and the Leidenfrost effect (where at high temperatures a vapor film surrounds the casting due to boiling, reducing heat transfer) are used as boundary conditions.
Use Simulation to Analyze Macrosegregation, Hot Tears, Heat Treatment ... by Andersen, Soeren / Modern Casting
 
 
 
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