Discussion
Which property is called the steady-flow availability function?
Answer: A
The steady-flow availability function is \(b = h - T_{0}s\) per unit mass, where \(h\) is the enthalpy, \(T_0\) the temperature of the surroundings and \(s\) the entropy. It is the maximum useful work obtainable from a steady flow stream, and it is also called the Keenan function. The expression \(u + P_0 v - T_0 s\) is the non-flow availability function, which is the one for a closed system, so the third option is wrong, and the other two are not the standard availability functions.
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