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A centrifugal pump delivers 50 dm3 /s of water at an impeller speed of 1450 rev/min. The impeller has eight vanes inclined backward to the direction of rotation with an angle at the tip of β'2 = 60° . The diameter of the impeller is twice the diameter of the shroud at inlet and the magnitude of the radial component of velocity at impeller exit is equal to that of the axial component of velocity at the inlet. The impeller entry is designed for the optimum flow condition to resist cavitation (see Eq. (7.20)) has a radius ratio of 0.35 and the blade shape corresponds to a well-tested design giving a cavitation coefficient σb = 5 0.3. Assuming that the hydraulic efficiency is 70% and the mechanical efficiency is 90%, determine
a. the diameter of the inlet;
b. the NPSH;
c. the impeller slip factor using Wiesner's formula;
d. the head developed by the pump;
e. the power input.
Also calculate values for slip factor using the equations of Stodola and Busemann, comparing the answers obtained with the result found from Wiesner's equation.
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Determine the minimum value of R and the corresponding value of x
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A pump is employed to deliver liquid water from a pond to a higher elevation. The pump steadily draws water from the pond at a volumetric flow rate of 192 gal/min through a pipe having a 7 in. diameter inlet. The exit diameter of the pipe is 2 in. an..
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Determine the additional force and moment reactions at the base O caused by the addition of the three 100-lb traffic signals B, C, and D. Report your answers as a force magnitude and a moment magnitude.
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Saturated water vapor at 2308F is sprayed into the moist air, which then exits the device at a relative humidity of 50%. Heat transfer between the device and its surroundings can be ignored, as can kinetic and potential energy effects.
A brass rod 1.5 cm in diameter is deformed in tension reducing its diameter to 1.128 cm. The data for brass in Fig. 7.19 will be helpful in solving this problem. If the deformation process was performed in one step, what was the yield stress of your ..
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