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tracker890 Source h

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- Homework Statement
- To determine system entropy in a steady flow

- Relevant Equations
- entropy balance in a steady flow

Q： Why the entropy value of this steady flow open system is not equal to zero?

My idea is as represented by the following equation.

$$

\frac{dS_{sys}}{dt}=0,\,\,\,\,dt\ne 0

$$

$$

\therefore dS_{sys}=0\,\,\,\,\,\,\,\,\therefore ∆Ssys=∆Sair=0

$$

$$

\therefore ∆\overset{\cdot}{S}sys=∆\overset{\cdot}{S}air=0

$$

reference. 7-25answer