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Water flows through the turbine shown in Fig. 7.28, at a rate of
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- The volume flow rate of water that recirculates from the blade outlet to the impeller is estimated to be 0.4524 ft^3/min, and the losses through the shaft sealing is negligible. The hydraulic and mechanical efficiency of a centrifugal pump are 95% and 93%, respectively. If the pump delivers water a flow rate of 12 ft^3/min, calculate the pump efficiency in %.arrow_forwardOil of specific gravity 0.750 is pumped from a tank over a hill through a 24′′ pipe with the pressure at the top of the hill maintained at 25.5 psi. The summit is 250 ft above the surface of the oil in the tank, and oil is pumped at the rate of 22.0 cfs. If the lost head from tank to summit is 15.7 ft, what horsepower must the pump supply to the liquid? Indicate the Free Body Diagramarrow_forwardPROBLEM 2: Water flows downwards in a vertical pipeline of gradually varying section from point 1 to point 2, which is 1.5m above point 1, at the rate of 0.9m^3/s. At section 1 the pipe diameter is 0.5m and pressure is 800 kPa. If pressure at section 2 is 600 kPa, determine the pipe diameter at that location. Neglect losses.arrow_forward
- A power plant requires 940 L/min of water. The required net head is 5 m at this flow rate. An examination of pump performance curves indicates that two centrifugal pumps with different impeller diameters can deliver this flow rate. The pump with an impeller diameter of 203 mm has a pump efficiency of 73 percent and delivers 10 m of net head. The pump with an impeller diameter of 111 mm has a lower pump efficiency of 67 percent and delivers 5 m of net head. What is the ratio of the required brake horse power (bhp) of the pump with 203-mm-diameter impeller to that of the pump with 111-mm-diameter impeller? (a) 0.45 (b) 0.68 (c) 0.86 (d) 1.84 (e) 2.11arrow_forwardThe turbine of a micro-hydroelectric power plant delivers 65hp at 75% efficiency. If the effective head is 115ft, how many cubic feet per minute of water must be used.arrow_forwardThe axial flow pump produces a discharge of 0.055 m3/s. (Figure 1) The impeller is rotating at ω = 70 rad/s, and it has a mean radius of 75 mm. The diameter of the impeller's shaft is 100 mm. Determine the magnitude of the velocity of the water as it exits the blades. Determine the magnitude of the relative velocity of the water as it flows off the blades of the impeller.arrow_forward
- A 25Hp suction pump operating at 56.30% efficiency draws water from a suction line whose diameter is 205mm and discharges into air through a line whose diameter is 155mm . The velocity in the 155mm line is 4m/s . If the pressure at point A in the suction pipe is -32kpa (negative sign indicate the pressure is below the atmosphere), where A is 1.8m below B on the 155mm line, determine the maximum elevation above B to which water can be raised assuming a head loss of 2.9m due to friction.arrow_forwardA centrifugal pump is discharging 900 gpm and which operates at 1800 rpm against a head of 120 ft and maximum efficiency of 91%. If this pump is modified to operate at 1200 rpm, assuming its efficiency remains constant, determine its discharge, the theoretical head it imparts to the liquid and the power input to the pump.arrow_forwardA 12-in diameter pump rotating at 600 rpm develops a head of 500 ft. Determine the peripheral velocity factor of the pump.arrow_forward
- A 2-in water jet with a velocity of 130 fps strikes a single vane moving in the same direction of the jet at a velocity of 50 fps. Determine the volumetric flow rate of the water that hits the vane in cfs.arrow_forward31. Situation 11 - Water flows through a horizontal Venturi meter whose inlet diameter is 31 cm. and throat diameter is 19 cm. The pressure at the inlet is 755 kPa and at the throat is 550 kPa. Neglect head lost. a. Determine the discharge in m3/s. Round off to three decimal places. b. Determine the velocity in the throat, in m/s. Round off to three decimal places. c. Determine the velocity in the inlet, in m/s. Round off to three decimal places.arrow_forwardA Pelton wheel has a mean bucket speed of 10 m/s with a jet of water flowing at the rate of 0.7 m³/s under a head of 30 m. If the buckets deflect the jet through an angle of 160°. Calculate the power given by water to the runner and hydraulic efficiency of turbine. Assume the coefficient of velocity of 0.98.arrow_forward
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