Problem 4.91 - Problem 4.91 Given: Data on water jet pump...

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Problem 4.91 [Difficulty: 3] Given: Data on water jet pump Find: Speed at pump exit; pressure rise Solution: Basic equation: Continuity, and momentum flux in x direction Assumptions: 1) Steady flow 2) Incompressible flow CV 3) Uniform flow From continuity ρ V s A s ρ V j A j ρ V 2 A 2 + 0 = V 2 V s A s A 2 V j A j A 2 + = V s A 2 A j A 2 V j A j A 2 + = V 2 10 ft s 0.75 0.1 0.75 × 100 ft s 0.1 0.75 × + = V 2 22 ft s = For x momentum p 1 A 2 p 2 A 2 V j ρ V j A j () V s ρ V s A s + V 2 ρ V 2 A 2 + = pp 2 p
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