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# p0728 - 790 CHAPTER 7 CONSERVATION OF ENERGY 7.28 Chapter 7...

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790 CHAPTER7 . CONSERVATIONOFENERGY 7.28 Chapter 7, Problem 28 There are two unknowns in this problem, namely, the outlet maximum velocity, U max ,and the head loss, h L . One equation follows from the mass-conservation principle. Using the momentum equation adds an unknown reaction force, and thus does not close our system of equations. Since the head loss is required as part of the solution, we use the differential form of the energy equation. To solve, we select the stationary control volume indicated in Figure 7.13. U, p in U out ,p out g 2 R 2 R z .................................................................................................................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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p0728 - 790 CHAPTER 7 CONSERVATION OF ENERGY 7.28 Chapter 7...

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