Discussion
Match each thermodynamic description in List I with the process it fits in List II.
List I
A. Adiabatic and irreversible
B. Adiabatic and reversible
C. Neither adiabatic nor reversible
D. Effectively isentropic despite being a wave
List II
1. Flow through a normal shock
2. Flow through a smooth nozzle with no losses
3. Flow in a heated duct with friction
4. Flow through a Mach wave
Select the correct match.
Answer: B
The distinction between adiabatic and isentropic is the one this table is built to sharpen. A shock is adiabatic yet raises entropy; an ideal nozzle is both adiabatic and reversible; a heated duct with friction is neither; and a Mach wave is so weak that its entropy rise, being cubic in strength, may be neglected entirely.
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