Heat Transfer
Multiple effect evaporation is generally recommended, when the

Corrosive liquids are to be concentrated
Evaporation on small scale is to be done
Fuel is cheaply available
Large scale evaporation of liquor is needed

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Heat Transfer
Leidenfrost point is a term concerned with the

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

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