Fluid Mechanics: Fundamentals and Applications
4th Edition
ISBN: 9781259696534
Author: Yunus A. Cengel Dr., John M. Cimbala
Publisher: McGraw-Hill Education
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Chapter 14, Problem 131P
To determine
The ratio of the required brake horse power of pump with
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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) 2.11
A centrifugal pump pumps water at a flow rate of 7 m³/s to a height of 10 m. If the pump works at the best efficiency point, find the pump impeller diameter, pump speed, the best efficiency value of the pump, the head at the best efficiency value, and the specific speed of the pump, given that CQ=0.15 CH=6 CP=0.75.
Water recirculates at a volume flow rate of 0.4524 ft3/min from the blade outlet to the impeller, and shaft sealing losses are negligible. A centrifugal pump has a hydraulic efficiency of 95% and a mechanical efficiency of 93%, respectively. Calculate the pump efficiency in percent if the pump delivers water at a flow rate of 12 ft3/min.
Chapter 14 Solutions
Fluid Mechanics: Fundamentals and Applications
Ch. 14 - What is the more common term for an...Ch. 14 - What the primary differences between fans,...Ch. 14 - List at least two common examples of fans, of...Ch. 14 - Discuss the primary difference between a porn...Ch. 14 - Explain why there is an “extra” term in the...Ch. 14 - For a turbine, discuss the difference between...Ch. 14 - Prob. 7CPCh. 14 - Prob. 8PCh. 14 - Prob. 9PCh. 14 - Prob. 10CP
Ch. 14 - There are three main categories of dynamic pumps....Ch. 14 - For each statement about cow cetrifugal the...Ch. 14 - Prob. 13CPCh. 14 - Consider flow through a water pump. For each...Ch. 14 - Write the equation that defines actual (available)...Ch. 14 - Consider a typical centrifugal liquid pump. For...Ch. 14 - Prob. 17CPCh. 14 - Consider steady, incompressible flow through two...Ch. 14 - Prob. 19CPCh. 14 - Prob. 20PCh. 14 - Suppose the pump of Fig. P1 4-19C is situated...Ch. 14 - Prob. 22PCh. 14 - Prob. 23EPCh. 14 - Consider the flow system sketched in Fig. PI 4-24....Ch. 14 - Prob. 25PCh. 14 - Repeat Prob. 14-25, but with a rough pipe-pipe...Ch. 14 - Consider the piping system of Fig. P14—24. with...Ch. 14 - The performance data for a centrifugal water pump...Ch. 14 - For the centrifugal water pump of Prob. 14-29,...Ch. 14 - Suppose the pump of Probs. 14-29 and 14-30 is used...Ch. 14 - Suppose you are looking into purchasing a water...Ch. 14 - The performance data of a water pump follow the...Ch. 14 - For the application at hand, the flow rate of...Ch. 14 - A water pump is used to pump water from one large...Ch. 14 - For the pump and piping system of Prob. 14-35E,...Ch. 14 - A water pump is used to pump water from one large...Ch. 14 - Suppose that the free surface of the inlet...Ch. 14 - Calculate the volume flow rate between the...Ch. 14 - Comparing the results of Probs. 14-39 and 14-43,...Ch. 14 - Prob. 45PCh. 14 - The performance data for a centrifugal water pump...Ch. 14 - Transform each column of the pump performance data...Ch. 14 - 14-51 A local ventilation system (a hood and duct...Ch. 14 - Prob. 52PCh. 14 - Repeat Prob. 14-51, ignoring all minor losses. How...Ch. 14 - Suppose the one- way of Fig. P14-51 malfunctions...Ch. 14 - A local ventilation system (a hood and duct...Ch. 14 - For the duct system and fan of Prob. 14-55E,...Ch. 14 - Repeat Prob. 14-55E, ignoring all minor losses....Ch. 14 - A self-priming centrifugal pump is used to pump...Ch. 14 - Repeat Prob. 14-60. but at a water temperature of...Ch. 14 - Repeat Prob. 14-60, but with the pipe diameter...Ch. 14 - Prob. 63EPCh. 14 - Prob. 64EPCh. 14 - Prob. 66PCh. 14 - Prob. 67PCh. 14 - Prob. 68PCh. 14 - Prob. 69PCh. 14 - Two water pumps are arranged in Series. The...Ch. 14 - The same two water pumps of Prob. 14-70 are...Ch. 14 - Prob. 72CPCh. 14 - Name and briefly describe the differences between...Ch. 14 - Discuss the meaning of reverse swirl in reaction...Ch. 14 - Prob. 75CPCh. 14 - Prob. 76CPCh. 14 - Prob. 77PCh. 14 - Prob. 78PCh. 14 - Prob. 79PCh. 14 - Prob. 80PCh. 14 - Wind ( =1.204kg/m3 ) blows through a HAWT wind...Ch. 14 - Prob. 82PCh. 14 - Prob. 84CPCh. 14 - A Francis radial-flow hydroturbine has the...Ch. 14 - Prob. 87PCh. 14 - Prob. 88PCh. 14 - Prob. 89PCh. 14 - Prob. 90CPCh. 14 - Prob. 91CPCh. 14 - Discuss which dimensionless pump performance...Ch. 14 - Prob. 93CPCh. 14 - Prob. 94PCh. 14 - Prob. 95PCh. 14 - Prob. 96PCh. 14 - Prob. 97PCh. 14 - Prob. 98PCh. 14 - Prob. 99PCh. 14 - Prob. 100EPCh. 14 - Prob. 101PCh. 14 - Calculate the pump specific speed of the pump of...Ch. 14 - Prob. 103PCh. 14 - Prob. 104PCh. 14 - Prob. 105PCh. 14 - Prob. 106PCh. 14 - Prob. 107EPCh. 14 - Prob. 108PCh. 14 - Prob. 109PCh. 14 - Prob. 110PCh. 14 - Prove that the model turbine (Prob. 14-109) and...Ch. 14 - Prob. 112PCh. 14 - Prob. 113PCh. 14 - Prob. 114PCh. 14 - Prob. 115CPCh. 14 - Prob. 116CPCh. 14 - Prob. 117CPCh. 14 - Prob. 118PCh. 14 - For two dynamically similar pumps, manipulate the...Ch. 14 - Prob. 120PCh. 14 - Prob. 121PCh. 14 - Prob. 122PCh. 14 - Calculate and compare the turbine specific speed...Ch. 14 - Prob. 124PCh. 14 - Prob. 125PCh. 14 - Prob. 126PCh. 14 - Prob. 127PCh. 14 - Prob. 128PCh. 14 - Prob. 129PCh. 14 - Prob. 130PCh. 14 - Prob. 131PCh. 14 - Prob. 132PCh. 14 - Prob. 133PCh. 14 - Prob. 134PCh. 14 - Prob. 135PCh. 14 - A two-lobe rotary positive-displacement pump moves...Ch. 14 - Prob. 137PCh. 14 - Prob. 138PCh. 14 - Prob. 139PCh. 14 - Prob. 140PCh. 14 - Which choice is correct for the comparison of the...Ch. 14 - Prob. 142PCh. 14 - In a hydroelectric power plant, water flows...Ch. 14 - Prob. 144PCh. 14 - Prob. 145PCh. 14 - Prob. 146PCh. 14 - Prob. 147PCh. 14 - Prob. 148PCh. 14 - Prob. 149PCh. 14 - Prob. 150PCh. 14 - Prob. 151P
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- A centrifugal pump transports water between two reservoirs. The pump has an outer diameter of 15 cm, an inner diameter of 8 cm, and a blade width of 2 cm and operates at 1750 rpm. If the water enters the pump axially at ẞ₁ = 45°, compute the volume flow rate, In the pump of problem 1, the water exits at ẞ₂ = 65° when the pump is driven at 1750 rpm. Compute the minimum power required by the pump?arrow_forwardA centrifugal pump delivers 3000,000 liters per hour of water to a pressurized thank whose pressure is 280 kPa. The source of water is 5 meters below the pump. The diameter of the suction pipe is 300 mm and the discharge pipe is 250 mm. calculate the KW rating of the driving motor assuming the pump efficiency to be 72%. (answer is 13.16 KW) with drawing.arrow_forwardA centrifugal pump with 2.3 diameter impeller running at 327 rpm delivers 7.9 m3/s of water. The head developed is 72.8 m. The width of the impeller at outlet is 0.22 m. If the overall efficiency is 91.7% determine the power to drive the pump.arrow_forward
- A centrifugal pump with 2.3 diameter impeller running at 327 rpm delivers 7.9 m/s of water. The head developed is 72.8 m. The width of the impeller at outlet is 0.22 m. If the overall efficiency is 91.7% determine the power to drive the pump. Also determine the blade angle at exit.arrow_forwardA centrifugal pump delivers 3000,000 liters per hour of water to a pressurized tank whose pressure is 280 kPa. The source of water is 5 meters below the pump. The diameter of the suction pipe is 300 mm and the discharged pipe is 250 mm. calculate the KW rating of the driving motor assuming the pump efficiency to be 72%.(answer is 13.16 KW)arrow_forwardProblem 1(5): A centrifugal pump transports water between two reservoirs. The pump has an outer diameter of 15 cm, an inner diameter of 8 cm, and a blade width of 2 cm and operates at 1750 rpm. If the water enters the pump axially at ẞ₁ = 45º¸ compute the volume flow rate, Problem 2(10): In the pump of problem 1, the water exits at B₂ 65° when the pump is driven at 1750 rpm. = Compute the minimum power required by the pump?arrow_forward
- A centrifugal pump having an overall efficiency of 75%, delivers 1850 liters of water per minute to a height of 20 m through a pipe 10 cm diameter and 100 m long. If f=0.012, calculate the hp to drive the pump.arrow_forwardThe outer diameter of an impeller of a centrifugal pump is 300mm and outlet width is 50mm. The pump is running at 800 rpm and is working against a total head of 20 m. The vanes angle at outlet is 40 deg and manometric efficiency is 75%. Determine: (a) velocity of flow at outlet; (b) velocity of water leaving the vane; (c) angle made by the absolute velocity at outlet with the direction of motion at outlet; and discharge.arrow_forwardA centrifugal pump consists out of an impeller, diffuser and casing and is powered by 300 kW (shaft power) and rotates at 96.3 rad/s. The flow rate generated by the machine is 54.7 Kilo-litres/min. The impeller blade inlet angle and width is 23° and 180 mm respectively. The blades occupy 12% of the impeller area and the water is assumed to enter the impeller radially. Suction and delivery pipes are equal in size. Determine: The flow through velocity is consistent through the pump find the fluid velocity at outlet ? What is the manometric head if the suction gauge shows -30kPa and the delivery gauge shows 210 kPa?arrow_forward
- A pump is driven at 1800 RPM and delivers 12 GPM at 2000 psi. If the volumetric efficiency is 90%, Calculate the volumetric displacement of this pump.arrow_forward2. A pump draws water from a lake delivered to a height of 50 meters above the lake and encounters 15 meters of headloss. Determine the pump power requirement in Kilo-Watts to deliver a constant supply of 500 Liters per second? The correct answer has a margin of 1 from exact answer. Velocity head is neglected.arrow_forward1. A centrifugal pump with 30 cm impeller delivers 30 l/s against a head of 24 m when running at 1750 rpm. What will be the delivery of a homologous pump of 15 cm impeller diam eter assuming same efficiencies and speed? 2. A centrifugal pump with 2.3 diameter impeller running at 327 rpm delivers 7.9 m3/s of water. The head developed is 72.8 m. The width of the impeller at outlet is 0.22 m. If the overall efficiency is 91.7% determine the power to drive the pump.arrow_forward
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