EBK FLUID MECHANICS: FUNDAMENTALS AND A
4th Edition
ISBN: 8220103676205
Author: CENGEL
Publisher: YUZU
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Chapter 14, Problem 115CP
To determine
The definition and application of pump turbine.
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(a) A centrifugal pump, with salt water as the working fluid, has the impeller blades
rotating at 750 rpm. The fluid enters the blades in the radial direction, i.e. at an angle
of α₁ = 0°, and exits the blades at an angle of 35° from the radial direction. i.e. α₂ =
35⁰. The inlet radius and blade width are r₁ 12.0 cm and b₁ = 18.0 cm,
respectively. The outlet radius and blade width are 1₂ = 24.0 cm and b₂ = 16.2 cm,
respectively. Assuming 100 percent efficiency, and if the volumetric flow-rate through
the pump is 0.573 m³/s, compute the net head produced by the centrifugal pump.
Furthermore, calculate the required brake horsepower in Watts. Take the density of salt
water to be p 998.0 kg/m³.
=
What is the pressure drop in the turbine? Answer: 1176.91 kPa (replace “turbine pressure drop” for “pump pressure increase”)
A single stage impulse turbine with a diameter of
120 cm runs at 3000 rpm. If the blade speed ratio
is 0.42, determine the inlet velocity of steam.
Chapter 14 Solutions
EBK FLUID MECHANICS: FUNDAMENTALS AND A
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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- When mechanical energy is illustrated by an ideal hydraulic turbine coupled with an ideal generator, explain it briefly?arrow_forwardB- Consider a typical centrifugal liquid pump. For each statement, choose whether the statement is true or false, and discuss your answer briefly: (a) V at the pump's free delivery is greater than V at its best efficiency point. (b) At the pump's shutoff head, the pump efficiency is zero. (c) At the pump's best efficiency point, its net head is at its maximum value. (d) At the pump's free delivery, the pump efficiency is zero.arrow_forward(d) If petroleum is a non-renewable resource, briefly explain how it can be prevented from extinction. (e) Define a boiler and give any two orientational examples of boilers. (f) Hydraulic Turbines can be classified according to the nature of working of water on blades. Differentiate Impulse from Reaction Turbines based on this nature. pdgearrow_forward
- A turbine is driven by a system that enters the turbine at the ff. conditions: 200 kg/h, 39 atm, 501 deg C, 49 m/s linear speed. The steam exits at a point 8 meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 290 m/s speed. 69000 W of shft work is delivered by the turbine while 100 kcal/h heat is lost. What is the value of (a) expansion work and (b) flow work? If the value is zero, explain why is it so.If it cannot be calculated, explain why.arrow_forwardA piston of double reciprocating pump running at 60 rpm to transport oil of 890 kg/m³. The pump has a stroke of 3 times of its diameter, and the diameter of the piston is 4 times of the rod diameter. The delivery and suction head are 60 m and 3 m, respectively. Design the piston pump to be driven by 5 kW, as the piston pump is not exceeded 85 %.arrow_forwardGive at least two reasons why turbines often have greater efficiencies than do pumps.arrow_forward
- A centrifugal pump operating under steady flow conditions delivers 2112kg/min of water from an initial pressure of 156 kPa to a final pressure of 1224 Pa. The diameter of the inlet pipe to the pump is 20cm and the diameter of the discharge pipe is 8cm. What is the work done?arrow_forwardGive examples of pump efficiency and turbine efficiency?arrow_forwardA reservoir is at effective height of 95m. An irreversible pump is used to pump a mass flow of 4500 kg/s of water from ground level into the reservoir. Consider water as an incompressible liquid with mass density of 1000kg/m . 1) What is the power consumption of pump for an isentropic pump efficiency of 82%? 2) What is the power that can be recovered from a turbine with 93%? (with the same mass flow and height). 3)What is the change in temperature of the pumped water?arrow_forward
- Why are Francis and Kaplan turbines generally consideredunsuitable for hydropower sites where the availablehead exceeds 1000 ft?arrow_forwardA centrifugal pump operating under steady flow conditions delivers 2275 kg/min of water from aninitial pressure of 82730 Pa to a final pressure of 275850 Pa. The diameter of the inlet pipe to thepump is 15.45 cm and the diameter of the discharge pipe is 10.18cm. What is the work in kW?arrow_forwardA centrifugal pump uses a 134767 rpm motor to pump 116334 kg/min of standard temperature water and has a pressure rise from 2 bar to 38 bar using a 0.11 cm diameter impeller. The Inlet diameter is 0.39 cm and the outlet diameter is 0.18 cm. The inlet and outlet are at the same level with each other. What will be your water power (in kW)? ?arrow_forward
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