Fluid Mechanics
8th Edition
ISBN: 9780073398273
Author: Frank M. White
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 11, Problem 11.80P
Determine if either (a) the smallest or (b) the largest of the seven Taeo pumps in Fig. Pl 1.24. running in series at 1160 r/min, can efficiently pump water at 20°C through 1 km of horizontal 12-cm-diameter commercial steel pipe.
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(B) Two similar centrifugal pumps are connected in series. The theoretical head-
discharge relation of Pump#1 is given by: h, = 5.3 – 0.58Q and that of Pump#2 is
given by: h, = 7.7 + 0.22Q. At a specific operation conditions, the head of these
combined pumps is 12 m. Estimate the followings:
(i) The head of each pump
(ii) If the flow out of this system is completely blocked while the two pumps still
running, what is the resulting total head of the system?
(iii) If the two pumps rotates with same speed, how many pump#2 is bigger than
pump#1?
Would the smallest, or the largest, of the seven Taco, Inc.pumps in Fig. be better (a) for producing, near bestefficiency, a water flow rate of 600 gal/min and ahead of95 ft? (b) At what speed, in r/min, should this pump be run?(c) What input power is required?
For each statement about centrifugal pumps, choose whether the statement is true or false, and discuss your answer briefly: (a) A centrifugal pump with radial blades has higher efficiency than the same pump with backward-inclined blades. (b) A centrifugal pump with radial blades produces a larger pressure rise than the same pump with backward- or forwardinclined blades over a wide ange of V. . (c) A centrifugal pump with forward-inclined blades is a good choice when one needs to provide a large pressure rise over a wide range of volume flow rates. (d) A centrifugal pump with forward-nclined blades would most likely have less blades than a pump of the same size with backward-inclined or radial blades.
Chapter 11 Solutions
Fluid Mechanics
Ch. 11 - Prob. 11.1PCh. 11 - Prob. 11.2PCh. 11 - Prob. 11.3PCh. 11 - Prob. 11.4PCh. 11 - Pl 1.5 What type of pump is shown in Fig. Pl 1.5?...Ch. 11 - Prob. 11.6PCh. 11 - A piston PDP has a 5-in diameter and a 2-in stroke...Ch. 11 - Pl 1.8 A Bell and Gossett pump at best efficiency,...Ch. 11 - Prob. 11.9PCh. 11 - Prob. 11.10P
Ch. 11 - Prob. 11.11PCh. 11 - Prob. 11.12PCh. 11 - Pl 1.13 A 3.5 hp pump delivers 1140 lbf of...Ch. 11 - Prob. 11.14PCh. 11 - Prob. 11.15PCh. 11 - Prob. 11.16PCh. 11 - Prob. 11.17PCh. 11 - Prob. 11.18PCh. 11 - Pl 1.19 A centrifugal pump has r2 = 9 in, b2 = 2...Ch. 11 - Prob. 11.20PCh. 11 - Prob. 11.21PCh. 11 - Prob. 11.22PCh. 11 - P11.23 When pumping water, (a) at what speed...Ch. 11 - Prob. 11.24PCh. 11 - Prob. 11.25PCh. 11 - Prob. 11.26PCh. 11 - Prob. 11.27PCh. 11 - Prob. 11.28PCh. 11 - Tests by the Byron Jackson Co. of a...Ch. 11 - A pump, geometrically similar to the 12.95-in...Ch. 11 - Prob. 11.31PCh. 11 - Prob. 11.32PCh. 11 - Prob. 11.33PCh. 11 - You are asked to consider a pump geometrically...Ch. 11 - Prob. 11.35PCh. 11 - Prob. 11.36PCh. 11 - Prob. 11.37PCh. 11 - Prob. 11.38PCh. 11 - Prob. 11.39PCh. 11 - Prob. 11.40PCh. 11 - Prob. 11.41PCh. 11 - Prob. 11.42PCh. 11 - The 28-in-diameter pump in Fig. 11.7a at 1170...Ch. 11 - Prob. 11.44PCh. 11 - Prob. 11.45PCh. 11 - Prob. 11.46PCh. 11 - PI 1.47 A pump must be designed to deliver 6 m /s...Ch. 11 - Pl 1.48 Using the data for the pump in Prob. Pl...Ch. 11 - Prob. 11.49PCh. 11 - Prob. 11.50PCh. 11 - Prob. 11.51PCh. 11 - Prob. 11.52PCh. 11 - Prob. 11.53PCh. 11 - Prob. 11.54PCh. 11 - Prob. 11.55PCh. 11 - Prob. 11.56PCh. 11 - Prob. 11.57PCh. 11 - Prob. 11.58PCh. 11 - Suppose it is desired to deliver 700 ftVmin of...Ch. 11 - Prob. 11.60PCh. 11 - Prob. 11.61PCh. 11 - Prob. 11.62PCh. 11 - Pl 1.63 A good curve-fit to the head vs. flow for...Ch. 11 - Prob. 11.64PCh. 11 - *P11.65 An 11.5-in-diameter centrifugal pump,...Ch. 11 - Pl 1.66 It is proposed to run the pump of Prob. Pl...Ch. 11 - Prob. 11.67PCh. 11 - Prob. 11.68PCh. 11 - The pump of Prob. P1138, running at 3500 r/min, is...Ch. 11 - Prob. 11.70PCh. 11 - Prob. 11.71PCh. 11 - Prob. 11.72PCh. 11 - Prob. 11.73PCh. 11 - Prob. 11.74PCh. 11 - Prob. 11.75PCh. 11 - Prob. 11.76PCh. 11 - Prob. 11.77PCh. 11 - Prob. 11.78PCh. 11 - Prob. 11.79PCh. 11 - Determine if either (a) the smallest or (b) the...Ch. 11 - Prob. 11.81PCh. 11 - Prob. 11.82PCh. 11 - Prob. 11.83PCh. 11 - Prob. 11.84PCh. 11 - Prob. 11.85PCh. 11 - Prob. 11.86PCh. 11 - Prob. 11.87PCh. 11 - Prob. 11.88PCh. 11 - A Pelton wheel of 12-ft pitch diameter operates...Ch. 11 - Prob. 11.90PCh. 11 - Prob. 11.91PCh. 11 - Prob. 11.92PCh. 11 - Prob. 11.93PCh. 11 - Prob. 11.94PCh. 11 - Prob. 11.95PCh. 11 - Prob. 11.96PCh. 11 - Prob. 11.97PCh. 11 - Prob. 11.98PCh. 11 - Prob. 11.99PCh. 11 - Prob. 11.100PCh. 11 - Prob. 11.101PCh. 11 - Prob. 11.102PCh. 11 - Prob. 11.103PCh. 11 - Prob. 11.104PCh. 11 - Prob. 11.105PCh. 11 - Prob. 11.106PCh. 11 - Prob. 11.107PCh. 11 - Prob. 11.108PCh. 11 - Prob. 11.1WPCh. 11 - Prob. 11.2WPCh. 11 - Prob. 11.3WPCh. 11 - Prob. 11.4WPCh. 11 - Prob. 11.5WPCh. 11 - Consider a dimensionless pump performance chart...Ch. 11 - Prob. 11.7WPCh. 11 - Prob. 11.8WPCh. 11 - Prob. 11.9WPCh. 11 - Prob. 11.10WPCh. 11 - Prob. 11.1CPCh. 11 - Prob. 11.2CPCh. 11 - Prob. 11.3CPCh. 11 - Prob. 11.4CPCh. 11 - Prob. 11.5CPCh. 11 - Prob. 11.6CPCh. 11 - Prob. 11.7CPCh. 11 - Prob. 11.8CPCh. 11 - Prob. 11.1DP
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- 1400 liters of water is needed to be pumped per minute from a lower reservoir to a higher reservoir as shown in Fig. Q2a. The elevation difference, z2 - zz is 7 m. Wrought iron pipes are used before and after the pump with diameters D1 = 100 mm and D2 = 127 mm Total pipe length of the piping system is 40 m. The length of pipe before the pump is 30 m. The elbows used are flanged smooth 90° bends. The valve is angle valve. Taco Model 4013 FI Series centrifugal pump with the performance curves as shown in Figure Q2(b) is selected. The location of the punmp is 1 m vertically below the lower reservoir and 30 m pipe-length away from the lower reservoir water exit point. (The properties of water: density, p = 997 kg/m³, viscosity, µ= 0.891 ×10³ kg/m.s, vapor pressure, Py = 3.169 kPa) a) Calculate the proper impeller size for this pump. b) Justify that there will be no cavitation. Curve na 2313 Min. Imp Bio. 675 Size 5x4x 12.75 Model 4013 1160 RPM NPSH aco' FI & CI Series 120LAS 20 25 40 45 50…arrow_forwardLarge hydroturbines achieve overall efficiencies above 95%, while the best efficiency of large pumps is a little more than 90%. Discuss some reasons for this to happen.arrow_forwardSuppose that you are willing to determine the diameter of the water jet impinging to the sink from the kitchen tap.The tap is produced to supply three different flow rates of the low, medium, and high. For each flow rate level, waterthat comes from the tap fills the beaker with a volume of 30 mL in 10 s, 6 s, and 2 s, respectively. The outlet of the tapis 13 mm, and the distance between the tap outlet and the sink is 53 mm. Determine the diameters of the water jetimpinging on the sink at three given flow rates.arrow_forward
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