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 138P
To determine
The correct option for "The pump specific speed in non dimensional form".
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A pump is designed to deliver 9500 L/min of water at a required head of 8 m. The pump shaft rotates at 1100 rpm. The pump specific speed in nondimensional form is (a) 0.277 (b) 0.515 (c) 1.17 (d ) 1.42 (e) 1.88
A pump with an impeller diameter of 300 mm running at a speed of 2950 rev/min delivering 450 L/min of water at a head of 350 kPa is going
to be replaced by a geometrically similar spare pump running at a speed of 1450 rev/min delivering the same flow rate and head. Determine
the impeller size of the spare pump and the percentage increase (decrease) of power required for the spare pump.
OL. 380.1 mm; a decrease of 61.33%
OI., 380.1 mm; an increase of 38.77%
I. 147.5 mm; an increase of 3.4%
IV. 210.3 mm; a decrease of 83.1%
A centrifugal pump having four stages in parallel delivers
12 kiloLiters per minute of liquid against a head of 25m.
The diameter of the impeller being 24 cm has a speed of
1800 rpm. A pump is to be made up with a number of
stages in series. In similar construction to that of the first
pump to run at 1250 rpm and to deliver 15 kiloLiters/min
against a total head of 250 m, find the number of stages
required in this case.
Select the correct response:
2.
4)
3.
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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- It is desired to deliver 4 gpm at a head of 670 m in a single pump having specific speed not to exceed 40. If the operating speed is not to exceed 1352 rpm, how many stages are required? Select the correct response: 0 7 O 5 3 6 Contin 2.arrow_forwardDetermine the least number of stages for a multi-stage pump to deliver 80 L/s against a total head of 240m when running at 1450 rpm if the specific speed (per stage) must not be less than 670. Select the correct response: 6. 3. 4. 7. 8arrow_forwardPumps: A centrifugal pump having 4 stages in parallel, delivers 18 kiloliters/min of liquid against a head of 25 m. The diameter of the impellers being 24 cm and the speed of 1800 rpm. A pump is to be made up with a number of stages in series of similar construction to that of the first pump to run at 1250 rpm and to deliver 15 kiloliters/min against a totalhead of 250 m. Find the diameter of the impellers and the number of stages required in this case. Answer: D = 46.63 cm, n = 6 stagesarrow_forward
- B-A pump has the following parameters N=2133.5 RPM, Ns = 40 RPM, D= 37.1 cm and is used to pump water up to 90 m(H) at maximum efficiency operation: write the answer only (a) At what speed should the pump be operated to pump water up to (76 m)? (b) What is the discharge in each case? (c) What is pumping power needed in each case? (d) What is consumed electrical power in each case if max = 90%? e- A pump discharges liquid at the rate of Q against a head of H. If specific weight of the liquid is w, find the expression for the pumping power.arrow_forwardA centrifugal pump having four stages in parallel, delivers 12 kiloliters per minute of liquid against a head of 25m. the diameter of the impeller being 24 cm and a speed of 1800 rpm. A pump is to be made up with a number of stages in series. In similar construction to that the first pump to run at 1250 rpm and to deliver 15 kiloliters/min against a total head of 250m. find the diameter of the impellers and the number of stages required in this case.arrow_forwardA centrifugal pump having an impeller of diameter 500 mm delivers 140 litres of water per sccond. The velocity of flow is 1 m/s and the vanes are curved back at outlet at 30° to the wheel tangent. If the impeller speed is 400 r.p.m., find the power to drive the pump. (Ans. 12-9 kW) 3.arrow_forward
- If a pump with a displacement of 16 cm/rev has an assumed overall efficiency of 90%, what speed and input brake horsepower would be required to deliver 40 1/min at a pressure of 20 MPa?arrow_forwardA centrifugal pump delivers 1.8m3 water against a head of 30m when rotating at 1200rpm. The diameter of its impeller is 45cm. If a pump with the same specific speed is to discharge 6.0m3/sec at 1100rpm, what is its impeller diameter? ANSWER: 69.2cmarrow_forward1Two water pumps are arranged in series. The performance data for both pumps follow the parabolic curve fit Havailable =H0 =aV ^2. For pump 1, H0 =5.30 m and coefficient a =0.0438 m/Lpm^2; for pump 2, H0 =8.70 m and coefficient a =0.0347 m/Lpm^2. In either case, the units ofnet pump head H are m, and the units of capacity V are Lpm.Calculate the combined shutoff head. Complete Answer, thank youarrow_forward
- A hydraulic vane pump running at 1800 rpm develops 2 L/s flow at 750 kPa. Volumetric efficiency is .85 and overall efficiency is 0.8. Determine the Theoretical Torque required, TT (N-m). (Hint: first calculate the mechanical efficiency and theoretical flow rate. Convert rpm to rad/s). O 9.41 N-m 8.85 N-m 9.35 N-m 9.62 N-m 8.80 N-marrow_forwardA pump has a specific speed of 42 and 600 rpm when it delivers 0.01 m3/s. find the head developed by the pump. Answer: 1015.29 ftarrow_forwardA pump is delivering 160 liters per second of water using an impeller diameter of 254mm and operating at a speed of 1800 rpm. If the speed is held constant and the impeller diameter is changed to 203.2 mm, what is the new discharged of the pump in liters per second?(128 L/s)arrow_forward
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