Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

From a metal wall from one medium to another
From heating an intermediate material and then heating the air from this material
By direct mixing
Heat is transferred by bleeding some gases from furnace

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Steam Boilers, Engines, Nozzles and Turbines
The effect of friction on the flow of steam through a nozzle is to

Decrease the mass flow rate and to decrease the wetness of steam
Increase the mass flow rate and to increase the exit temperature
Increase the exit temperature without any effect on mass flow rate
Decrease the mass flow rate and to increase the wetness of steam

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