Discussion
The point of maximum entropy on a Fanno-curve in a Temperature-Entropy (T-s) diagram represents the
Answer: C
The point of maximum entropy on the Fanno curve is the sonic state, M = 1.
Fanno flow is adiabatic flow with friction in a constant-area duct. Friction is irreversible, so entropy must rise along the duct. The Fanno curve has a subsonic upper branch and a supersonic lower branch, and friction drives both toward the point of maximum entropy, where the Mach number is 1 and the flow is choked.
It is not a maximum or minimum Mach number: subsonic flow accelerates toward 1 and supersonic flow decelerates toward 1. A normal shock joins a point on the supersonic branch to one on the subsonic branch with the same mass flux and stagnation enthalpy; it is not the maximum-entropy point.
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