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A spray system is shown in the diagram. Water is supplied at p = 10 kPa gage, through the flanged opening of area A = 1900 mm2. The water leaves in a steady free jet at atmospheric pressure. The jet area and speed are A = 650 mm2 and V = 4.6 m/s. The mass of the spray system is 0.09 kg and it contains V = 196 cm3 of water.
P6.57
An object, with a flat horizontal lower surface, moves downward into the jet of the spray system with speed U = 5 ft/s. Determine the minimum supply pressure needed to produce the jet leaving the spray system at V = 15 ft/s. Calculate the maximum pressure exerted by the liquid jet on the flat object at the instant when the object is h = 1.5 ft above the jet exit. Estimate the force of the water jet on the flat object.
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Fox and McDonald's Introduction to Fluid Mechanics
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