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 72CP
To determine
The reason that turbine often has greater efficiencies than pumps.
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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.
A centrifugal pump driven by a 120-kW motor rotating at 2400 rpm is used to pump 20°C water in a manufacturing plant. The pump operates against a head of 30m and has an efficiency of 70%. What quantity of water (in m^3/s) can the pump deliver?
=
(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.
=
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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- Solve it quickly pleasearrow_forwardA 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_forwardENPY = (+ 3.2 cm. Centrifugal pump rotates at 1500 rpm. Water enters the wings normally and exits by 38 degrees from the radial direction. The volumetric flow rate is given as 0.25 m^3/s. By accepting the yield as 100%; A centrifugal pump impeller has an inlet radius of 15 cm and a blade width of 6.3 cm. Its radius at the exit is 35 cm and its wingspan is (a2 = 38°) (Psu = 998 kg/m³) P1 + as 29 pg P2 + d2 29 pg L V² hg sûrekli= f-52g + zz + hpompa.f + hearbing + hg,toplam Re = p.V. D + z2 1.11 = -1.8 log Re 6.9 ɛ / D hkyerel = KK 29 Wmil = 3.7 hg,toplam= hx,sarekli + hx.yerel Протра H = pg z/1ẠM Nsp = (gH)³/4 ротра giris Wmil,B WmilA WR %3D PR (we PA b) Find the required shaft power for the centrifugal a) Find the manometric head provided by the centrifugal pump. pump. 28092 W 17,05 m O 42087 W 21,28 m O 38085 W 13,67 m O 45765 W 12,23 m O 35063 W 15,56 marrow_forward
- A centrifugal pump running at 750r.p.m. discharges water at 0. Im3/s against a head of 10 m at its best efficiency. A second pump of the same homologous series, when working at 500r.p.m., is to deliver water at 0.05m3/s at its best efficiency. What will be the design head of the second pump and what is the scale ratio between the first and the second?arrow_forwardFor an inward flow reaction turbine has an external diameter as 1.5 m and width of 13.5 cm. The turbine speed is 600 rpm and the water flow rate is 420m / min. The turbine operates under a head of 260 m and developing 16.12 MW. Calculate efficiency, baled angle at inlet, and guide vane angle at inlet, if the velocity at the draft tube inlet is 16 m / s.arrow_forwardA hydraulic orchard pruner is driven by an engine with an output of 20 bhp . If the pump has a mechanical efficiency of 90% . what portion of the engine power is lost to pump friction ?arrow_forward
- Please answerarrow_forwardTo maximise power in Pelton turbine, the bucket speed must be (1) equal to the jet speed (2) equal to half of the jet speed (3) equal to twice the jet speed (4) independent of the jet speedarrow_forward6. Water is pumped to a storage tank from a pool by a centrifugal pump. The elevation difference between the pool and the storage tank is 60 m. The storage tank and the pool are open to atmosphere. 50 meters of 6 in Sc 40 steel pipe is used between pool and pump. After the pump 6 in Sc 40 pipe with a length of 22 m is suddenly contracted to 4 in Sc 40 pipe, that is 70 m. The flow rate of water is 2.5 m/min and the temperature is 20°C. If the pump efficiency is 0.6 and the cost of electrical energy is 0.40 TL/kWh,calculate daily cost of electricity used for this system. 2m +in Sc 40 70m Open gate valve Storage tank 60m 22 m 2m Pool Open gate valve 6 In Sc 40 6 in Sc 40 50m pumparrow_forward
- Show the complete solution for this problemarrow_forwardIn centrifugal pumps, maximum efficiency is obtained when the blades are(A) Straight (B) Bent forward (C) Bent backward (D) Radialarrow_forwardAn impeller of a centrifugal pump runs at 90 rpm under a net head of 10 m and has vanes inclined at 120° to the direction of motion at outlet. The diameter of impeller at exit is double than that at inlet and velocity of flow is constant at 2.5 m/s. The manometric efficiency is 75 %. Find: (a) diameter of impeller at exit and (b) Vane angle at inlet.arrow_forward
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