Problem 4.111 - Problem *4.111 [Difficulty: 4] CS Given:...

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Problem *4.111 [Difficulty: 4] CS c d Given: Air jet striking disk Find: Manometer deflection; Force to hold disk Solution: Basic equations: Hydrostatic pressure, Bernoulli, and momentum flux in x direction p ρ V 2 2 + gz + constant = Assumptions: 1) Steady flow 2) Incompressible 3) No friction 4) Flow along streamline 5) Uniform flow 6) Horizontal flow (g x = 0) Applying Bernoulli between jet exit and stagnation point p ρ air V 2 2 + p 0 ρ air 0 + = p 0 p 1 2 ρ air V 2 = But from hydrostatics p 0 p SG ρ g h = so h 1 2 ρ air V 2 SG ρ g = ρ air V 2 2SG ρ g = h 0.002377 slug ft 3
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