Isentropic process | Constant entropy process

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What is isentropic process?


In thermodynamic process, an isentropic process is an idealized process that is both adiabatic and reversible. Isentropic is the process in which the entropy is constant so it is also called constant entropy process. Thus, ∆S = 0. 

Example of the isentropic process:


Pump, Gas compressor, Turbine, Nozzles, Diffusers are some example and follows the isentropic process of thermodynamics. 

Theoretical explanation:


According to first law of thermodynamics, 

 H = U + P V

 d H = d Q + V d P  OR  d H = T d S + V d P

 In this equation, V d P is a flow process work. Where d P is a change in pressure. 

 Now, at constant entropy, the enthalpy change equals to the isentropic process. 

 Thus, d Q = 0.   

 So, d H = V d P 

 Therefore, W = H2 - H1 = Cp ( T2 - T1) 

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