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Describe, with the aid of sketches, the relationship between geometry and specific speed for pumps
a. A model centrifugal pump with an impeller diameter of 20 cm is designed to rotate at 1450 rpm and to deliver 20 dm3 /s of freshwater against a pressure of 150 kPa. Determine the specific speed and diameter of the pump. How much power is needed to drive the pump if its efficiency is 82%?
b. A prototype pump with an impeller diameter of 0.8 m is to be tested at 725 rpm under dynamically similar conditions as the model. Determine the head of water the pump must overcome, the volume flow rate, and the power needed to drive the pump.
Entropy Generation in a Steam Turbine, Steam at a rate of 15lbm/s enters a turbine at 500 Psia, 800f and exits at 5 Psia. For a reversible, adiabatic process (iseentropic)
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Air exits a turbine at 250 kPa, 3000C at a flow rate of 1000 l/s. Determine the mass flow rate in m/s modeling the air as an ideal gas.
a system receives 0.756 kgs of a fluid at a velocity of 36.58 ms at an elevation of 30.48 m. at the exit at an
Air enters a nozzle steadily with a density of 2.5 kg/m3 and velocity of 40 m/s. It leaves the nozzle at a density of 0.81 kg/m3 and an exit velocity of 150 m/s. If the inlet area of the nozzle is 100 cm2, determine the exit area of the nozzle.
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A quantity of water with in a piston-cylinder assembly executes a Carnot power cycle. During isothermal expansion, the water is heated from saturated liquid at 50 bar until it is a saturated vapour. The vapour then expands adiabatically to a pressure..
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