Effects of friction on flow through Steam Nozzle.

Question

Explain the effects of friction on the flow through a steam nozzle?

Answer 1

The following are the effects of friction on the flow through a steam nozzle:

a) Expansion will not be isentropic.
b) Enthalpy drop is reduced.
c) Entropy is increased.
d) Final dryness fraction of the steam is increased as the kinetic energy gets converted into heat due to friction and is absorbed by steam.
e) The specific volume of steam increases as the steam becomes drier due to frictional reheating.