Discussion
Match each device with the simplification usually made to the steady flow energy equation.
List I
A. Adiabatic turbine
B. Throttling valve
C. Adiabatic nozzle
D. Heat exchanger
List II
1. kinetic energy gain equals the enthalpy drop
2. shaft work equals the drop in enthalpy
3. heat transferred equals the enthalpy change
4. enthalpy is unchanged across the device
Answer: A
Correct answer: A-2, B-4, C-1, D-3
Each device is characterised by which terms of the steady flow energy equation survive. An adiabatic turbine has no heat and negligible velocity change, so the shaft work equals the enthalpy drop. A throttling valve has neither heat nor work, so the enthalpy is unchanged. An adiabatic nozzle has no work, so the enthalpy drop appears as kinetic energy. And a heat exchanger has no work, so the heat transferred equals the enthalpy change.
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