Fluid (S = 1.5) drains from a large enclosed tank. The outlet is 2 m below the fluid upper surface. Assume inviscid flow. (a) The upper surface of the fluid is at atmospheric pressure. At what velocity does the fluid leave the tank? (b) To increase the outflow velocity, the air in the tank above the fluid is pressurized. What pressure (gauge) is required in the air space to double the outflow velocity? (The outlet is small and the upper surface is large; thus the speed of the fluid at the upper surface is much less than the speed at the outlet.)

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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.