Problem 13.18 - Problem 13.18 [Difficulty: 2] Given: Flow...

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Problem 13.18 [Difficulty: 2] Given: Flow in a converging-diverging nozzle to a pipe Find: Plot of mass flow rate Solution: The given or available data is R = 286.9 J/kg · K k = 1.4 T 0 = 293 K p 0 = 101 kPa D t = 1 cm De = 2.5 cm A t = 0.785 cm 2 A e = 4.909 cm 2 Equations and Computations: The critical pressure is given by p * = 53.4 kPa This is the minimum throat pressure For the CD nozzle, we can compute the pressure at the exit required for this to happen A* = 0.785 cm 2 (= A t ) A e / A * = 6.25 M e = 0.0931 or 3.41 (Eq. 13.7d)
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