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
Heat transfer between two highly viscous liquids
Concentration of a corrosive solution by evaporation

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Heat Transfer
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Shell and tube heat exchanger with air inside tubes and steam on shell side
Shell and tube heat exchanger with air on shell side and steam inside tubes
Finned tube heat exchanger with air outside and steam inside
Finned tube heat exchanger with air inside and steam outside

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