4.59 In the region just downstream of a sluice gate, the water may develop a reverse flow region as is indicated in Fig. P4.59 and Video V10.9. The velocity profile is assumed to con- sist of two uniform regions, one with velocity V₁ = 10 fps and the other with V, 3 fps. Determine the net flowrate of water across the portion of the control surface at section (2) if the channel is 20 ft wide. V Sluice gate file Control surface

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Fluid Dynamics

The study of the flow of gases and liquids, usually in and around solid surfaces, is known as fluid dynamics in physics and engineering. Fluid dynamics, for example, can be used to evaluate the movement of air through an airplane wing or the surface of a vehicle. It can also be used in ship design to increase the speed at which ships pass through water.