Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are those in which

Forced circulation takes place
Water passes through the tubes and flue gases around it
Flue gases pass through tubes and water around it
Tubes are laid vertically

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

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