Water at 40 °C is pumped from an open tank through 200 m of 50-mm-diameter smooth horizontal pipe as shown in Figure 1 and discharges into the atmosphere with a velocity of 3 m/s. Minor losses are negligible. (a) If the efficiency of the pump is 70%, how much power is being supplied to the pump? (b) What is the NPSHA at the pump inlet? Neglect losses in the short section of pipe connecting the pump to the tank. Assume standard atmospheric pressure. Note: for smooth pipe, friction factor, f = 0.0152 and at 40 °C. Temperature (°C) kinematic viscosity (m²/s) 6.58 x 10-7 Water vapor pressure (N/m²) Specific weight (N/m³) 40 7.376 x 10³ 9.731 x 10³ ! T 3 m Į PUMP 9.731x Diameter = 50 mm Length = 200 m Figure 1

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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.