Heat Transfer
Film boiling is usually not desired in commercial equipments, because

it is not economic
none of the listed here
the heat transfer rate is low in view of the large temperature drop. @
it is difficult to maintain

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Heat Transfer
Leidenfrost point is a term concerned with the

Boiling of a liquid on a hot surface
Condensation of the saturated vapor on a cold surface
Concentration of a corrosive solution by evaporation
Heat transfer between two highly viscous liquids

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