Applied Fluid Mechanics
7th Edition
ISBN: 9780133414622
Author: UNTENER
Publisher: YUZU
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Chapter 11, Problem 11.42PP
It is desired to drive a small, positive-displacement pump by chucking a household electric drill to the drive shaft of the pump. The pump delivers
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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 %.
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Chapter 11 Solutions
Applied Fluid Mechanics
Ch. 11 - Water at 10C flows from a large reservoir at the...Ch. 11 - For the system shown in Fig. 11.14, kerosene (...Ch. 11 - Figure 11.15 shows a portion of a hydraulic...Ch. 11 - Figure 11.16 shows part of a large hydraulic...Ch. 11 - Oil is flowing at the rate of 0.015m3/s in the...Ch. 11 - For the system shown in Fig. 11.18, calculate the...Ch. 11 - A liquid refrigerant flows through the system,...Ch. 11 - Water at 100F is flowing in a 4-in Schedule 80...Ch. 11 - A hydraulic oil is flowing in a drawn steel...Ch. 11 - In a processing plant, ethylene glycol at 77F is...
Ch. 11 - Water at 15C is flowing downward in a vertical...Ch. 11 - Turpentine at 77F is flowing from A to B in a 3...Ch. 11 - ]11.13 A device designed to allow cleaning of...Ch. 11 - Kerosene at 25C is flowing in the system shown in...Ch. 11 - Water at 40C is flowing from A to B through the...Ch. 11 - Oil with a specific gravity of 0.93 and a dynamic...Ch. 11 - Determine the required size of new Schedule 80...Ch. 11 - What size of standard hydraulic copper tube from...Ch. 11 - Water at 60F is to flow by gravity between two...Ch. 11 - The tank shown in Fig. 11.24 is to be drained to a...Ch. 11 - Figure 11.25 depicts gasoline flowing from a...Ch. 11 - For the system in Fig. 11.26, compute the pressure...Ch. 11 - For the system in Fig. 11.26, compute the total...Ch. 11 - For the system in Fig. 11.26 specify the size of...Ch. 11 - A manufacturer of spray nozzles specifies that the...Ch. 11 - Specify the size of new Schedule 40 steel pipe...Ch. 11 - Refer to Fig. 11.27. Water at 80C is being pumped...Ch. 11 - For the system shown in Fig. 11.27 and analyzed in...Ch. 11 - In a water pollution control project, the polluted...Ch. 11 - Repeat Problem 11.29, but use a 3-in Schedule 40...Ch. 11 - Water at 10C is being delivered to a tank on the...Ch. 11 - If the pressure at point A in Fig. 11.29 is 300...Ch. 11 - Change the design of the system in Fig. 11.29 to...Ch. 11 - It is desired to deliver 250 gal/min of ethyl...Ch. 11 - For the system shown in Fig. 11.30, compute the...Ch. 11 - Repeat Problem 11.35, but consider the valve to be...Ch. 11 - Repeat Problem 11.35, but consider the valve to be...Ch. 11 - Figure 11.31 depicts a DN 100 Schedule 40 steel...Ch. 11 - Repeat Problem 11.38 but replace the globe valve...Ch. 11 - Repeat Problem 11.38 but use a DN 125 Schedule 40...Ch. 11 - Repeat Problem 11.38, but replace the globe valve...Ch. 11 - It is desired to drive a small,...Ch. 11 - Figure 11.32 shows a pipe delivering water to the...Ch. 11 - Repeat Problem 11.43, except consider that there...Ch. 11 - A sump pump in a commercial building sits in a...Ch. 11 - For the system designed in Problem 11.45, compute...Ch. 11 - Figure 11.33 shows a part of a chemical processing...Ch. 11 - For the system described in Problem 11.47, and...Ch. 11 - For the system described in Problem 11.47, and...Ch. 11 - For the system described in Problem 11.47, and...Ch. 11 - Analyze the system shown in Fig. 11.11 with...Ch. 11 - Create a program or a spreadsheet for analyzing...Ch. 11 - Create a program or a spreadsheet for determining...
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- A plant has installed a single-suction centrifugal pump with a discharge of 68 m3/hr under 60 m head and running at 1 200 rpm. It is proposed to install another pump with double suction but of the same type to operate at 30 m head and deliver 90 m3/hr. Determine the brake power of the existing and the proposed pumps assuming that the efficiency is 82%.arrow_forwardThe impeller of the centrifugal pump is 350 mm diameter, and the width of the blade passages at outlet is 18 mm. A pump, which runs at 16.6 rev/s, is mounted so that its centre is 2.4 m above the water level in the suction sump. It delivers water to a point 19 m above its centre; the friction loss in the suction pipe is 68 Q² meter and that in the delivery pipe is 650 Q² meter where Q in m3/s is the rate of flow. The blades themselves occupy 5% of the circumference and are backward facing at 35° to the tangent. At inlet, the flow is radial and the radial component of velocity remains unchanged through the impeller. Assuming that 50% of the velocity head of the water leaving the impeller is converted to pressure head in the volute, and that friction and shock losses in the pump, the velocity heads in the suction and delivery pipes are negligible, calculate the following:The flow rate, m3/s, of the pump. Manometric efficiency, in %, of the pump.arrow_forwardThe impeller of the centrifugal pump is 350 mm diameter, and the width of the blade passages at outlet is 18 mm. A pump, which runs at 16.6 rev/s, is mounted so that its centre is 2.4 m above the water level in the suction sump. It delivers water to a point 19 m above its centre; the friction loss in the suction pipe is 68 Q² meter and that in the delivery pipe is 650 Q² meter where Q in m3/s is the rate of flow. The blades themselves occupy 5% of the circumference and are backward facing at 35° to the tangent. At inlet, the flow is radial and the radial component of velocity remains unchanged through the impeller. Assuming that 50% of the velocity head of the water leaving the impeller is converted to pressure head in the volute, and that friction and shock losses in the pump, the velocity heads in the suction and delivery pipes are negligible, calculate the following: The flow rate, m3/s, of the pump. Manometric efficiency, in %, of the pump.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_forwardFor a centrifugal pump of impeller diameter D rotating at N to develop a head of H and discharge Q, what would be the new head developed by the same pump if we halve the impeller speed to N/2? H/A 2H H 4H H/2arrow_forwardThe axial flow pump produces a discharge of 0.095 m3/sm3/s. (Figure 1) The impeller is rotating at ω� = 80 rad/srad/s, and it has a mean radius of 75 mmmm. The diameter of the impeller's shaft is 100 mmmm. Determine the angle α2�2, which the velocity of the water as it exits the blades V2�2 makes with its tangential component Vt2��2. Express your answer using three significant figures.arrow_forward
- A centrifugal pump with impeller diameter 500mm is designed for a discharge of 1.0m3/s of water. The water enters the pump axially, leaving the impeller with an absolute velocity of 12m/s at an angle of 20degrees to the tangent at the impeller periphery. The impeller is rotating at 700rpm. Determine the exit vane angle and the hydraulic power delivered.arrow_forwardA pump draws water from open reservoir A at 20 ft above pump centerline and lifts to an open reservoir B at 250 ft above pump centerline. The loss of head at the suction is 5 times the velocity head at the 6 inches suction pipe and at the discharge is 15 times the velocity head at the 4 inches discharge pipe. The pump discharge is 200 GPM. a. The total dynamic head in ft.arrow_forwardA radial flow pump operating at maximum efficiency at a specific speed of 2300 is to deliver 260gpm against a head of 129ft at a rotative speed of 2100 rpm. Find the required number of stages. ANSWER: 3arrow_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_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_forwardA Pelton wheel working under a head of 500m produces 13MW at a speed of 430rpm. If the velocity of the wheel is 0.46 the velocity of the jet and the hydraulic efficiency of the wheel is 85% with a coefficient of velocity of 0.98, determine the following: Discharge of the turbine Diameter of the wheel Diameter of the nozzlearrow_forward
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