Udt

2. Energy h +1 V2 - constant - h0 - cpT0 - cpT +1 V2 (9-50a) or dh + VdV - 0 (9-50b)

Since the fluid properties are defined by the entropy and enthalpy, Eqs. (9-50) represent a curve on an h—s diagram, which is called a Fanno line.

By making use of the isentropic condition (i.e. P/pk - constant), the following relations can be shown h - CpT - P (A) (9-52)

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