The expansion in a turbine is adiabatic and irreversibility. The entropy of the steam at inlet is 6.939 kJ/ kg. k and the turbine exhaust at a pressure of 7 kN/m2 . if the dryness fraction of the steam at exhaust is 0.91, calculate the lost work done due to irreversibility per kg of steam flowing through the turbine. If the inlet pressure 4Mpa, what is the isentropic efficiency of the turbine.

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.