Fox and McDonald's Introduction to Fluid Mechanics
9th Edition
ISBN: 9781118912652
Author: Philip J. Pritchard, John W. Mitchell
Publisher: WILEY
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Textbook Question
Chapter 10, Problem 5P
Dimensions of a centrifugal pump impeller are
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The specific speed (nq) of a pump provides information…
a. on the expected revolution number of the driving motor.
b. on the number of blades.
c. on the circumferential velocity of the impeller.
d. on the shape (type) of the impeller (axial, radial or mixed).
I need the answer as soon as possible
A single stage centrifugal pump has an impeller of 250 mm diameter
which rotates at 1,800 rpm and lifts 60 lit/sec to 25 m with an efficiency
of 70%. Obtain the number of stages and diameter of each impeller of a
similar multi-stage pump to lift 75 lit/sec to 175 m at 1,500 rpm.
(8 stages ; 280 mm dia)
Chapter 10 Solutions
Fox and McDonald's Introduction to Fluid Mechanics
Ch. 10 - The geometry of a centrifugal water pump is r1 =...Ch. 10 - Find the resulting -groups when (a) D, , and Q or...Ch. 10 - Consider the centrifugal pump impeller dimensions...Ch. 10 - Dimensions of a centrifugal pump impeller areCh. 10 - Dimensions of a centrifugal pump impeller areCh. 10 - The blade is one of a series. Calculate the force...Ch. 10 - This blade is one of a series. What force is...Ch. 10 - A centrifugal water pump, with 15-cm-diameter...Ch. 10 - A centrifugal water pump designed to operate at...Ch. 10 - A series of blades, such as in Example 10.13,...
Ch. 10 - In passing through this blade system, the absolute...Ch. 10 - A centrifugal pump runs at 1750 rpm while pumping...Ch. 10 - A centrifugal water pump designed to operate at...Ch. 10 - Kerosene is pumped by a centrifugal pump. When the...Ch. 10 - In the water pump of Problem 10.8, the pump casing...Ch. 10 - Use data from Appendix C to choose points from the...Ch. 10 - Data from tests of a water suction pump operated...Ch. 10 - A centrifugal pump impeller having r1 = 50 mm, r2...Ch. 10 - A centrifugal pump impeller having dimensions and...Ch. 10 - An axial-flow fan operates in sea-level air at...Ch. 10 - Data measured during tests of a centrifugal pump...Ch. 10 - A small centrifugal pump, when tested at N = 2875...Ch. 10 - If the impeller of Problem 10.20 rotates between...Ch. 10 - At the outlet of a pump impeller of diameter 0.6 m...Ch. 10 - Typical performance curves for a centrifugal pump,...Ch. 10 - A pump with D = 500 mm delivers Q = 0.725 m3/s of...Ch. 10 - At its best efficiency point ( = 0.87), a...Ch. 10 - Using the performance curves in Appendix C, select...Ch. 10 - A pumping system must be specified for a lift...Ch. 10 - A centrifugal water pump operates at 1750 rpm; the...Ch. 10 - A set of eight 30-kW motor-pump units is used to...Ch. 10 - A blower has a rotor with 12-in. outside diameter...Ch. 10 - A centrifugal water pump has an impeller with an...Ch. 10 - Appendix C contains area bound curves for pump...Ch. 10 - Use data from Appendix C to verify the similarity...Ch. 10 - A centrifugal water pump has an impeller with...Ch. 10 - Catalog data for a centrifugal water pump at...Ch. 10 - A 1/3 scale model of a centrifugal water pump...Ch. 10 - Sometimes the variation of water viscosity with...Ch. 10 - A large deep fryer at a snack-food plant contains...Ch. 10 - Data from tests of a pump, with a...Ch. 10 - A four-stage boiler feed pump has suction and...Ch. 10 - A centrifugal pump operating at N = 2265 rpm lifts...Ch. 10 - A centrifugal pump is installed in a piping system...Ch. 10 - Part of the water supply for the South Rim of...Ch. 10 - Consider the flow system shown in Problem 8.94....Ch. 10 - Afire nozzle is supplied through 300 ft of...Ch. 10 - Performance data for a centrifugal fan of 3-ft...Ch. 10 - The performance data of Problem 10.57 are for a...Ch. 10 - Experimental test data for an aircraft engine fuel...Ch. 10 - Preliminary calculations for a hydroelectric power...Ch. 10 - Conditions at the inlet to the nozzle of a Pelton...Ch. 10 - A Francis turbine is to operate under a head of 46...Ch. 10 - A Kaplan (propeller with variable-pitch blades)...Ch. 10 - Francis turbine Units 19, 20, and 21, installed at...Ch. 10 - Measured data for performance of the reaction...Ch. 10 - For a flow rate of 12 L/s and turbine speed of 65...Ch. 10 - The velocity of the water jet driving this impulse...Ch. 10 - An impulse turbine is to develop 15 MW from a...Ch. 10 - An impulse turbine under a net head of 33 ft was...Ch. 10 - The absolute velocities and directions of the jets...Ch. 10 - A fanboat in the Florida Everglades is powered by...Ch. 10 - A jet-propelled aircraft traveling at 225 m/s...Ch. 10 - When an air jet of 1-in.-diameter strikes a series...Ch. 10 - The volume flow rate through the propeller of an...Ch. 10 - A typical American multi blade farm windmill has D...Ch. 10 - An airplane flies at 200 km/h through still air of...Ch. 10 - This ducted propeller unit drives a ship through...Ch. 10 - A model of an American multi blade farm windmill...Ch. 10 - A large Darrieus vertical axis wind turbine was...Ch. 10 - Show that this ducted propeller system when moving...Ch. 10 - This ducted propeller unit (now operating as a...Ch. 10 - What is the maximum power that can be expected...Ch. 10 - If an ideal windmill is operating at best...Ch. 10 - A prototype air compressor with a compression...Ch. 10 - Prob. 89PCh. 10 - We have seen many examples in Chapter 7 of...
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- Complete the following tasks: QUESTION 1: A 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: 1.1. The impeller inlet (i) diameter and inlet blade velocity. (Hint - Substitution: Vn in terms of Di and U, in terms of D; both sub into Tan of Blade inlet angle, only unknown is then solving for D?) ANS: 300 mm; 14.42 m/s If the pump has a mechanical efficiency of 80%, calculate the blade velocity at outlet (Uo) and outlet whirl velocity Vwo. Assume the blade exit angle equal to the guide vane angle. (Hint - Substitution: Write Vwo in terms of U. sub in Euler equation only unknown then is solve for Vwo) ANS: Vwo = 11.54…arrow_forwardpower loss due to wires is calculated by .... e A I2*R B. | C. I*V?arrow_forwardEX1: Given are the following data for a commercial centrifugal water pump: r1 =10 cm, r2 = 17.5 cm, By =30°, B2 =20°, speed =1440 r/min. Estimate (a) the design point discharge, (b) the water horsepower, and (c) the head if by = b2 = 4.4 cm.(Hint. design point discharge, i.e 11=90°)arrow_forward
- Draw Head –Capacity curve of centrifugal pump at varying pumping speeds.arrow_forwardI need the answer as soon as possiblearrow_forwardThis is a fluid machine question. 1. A single stage centrifugal pump delivers 900 m^3/hr of sea water from a source where the water where the pressure is O.125 mpag. The pump discharges into surge tank rated at 300 psig, 3 m above the pump centerline. Loss of head due to friction in suction is 0.8 m and that in the discharge side is 3 m . Calculate the power required by the pump in kW. 2. An atmospheric tank at standard ambient conditions will serve as the source for a pump. It is calculated the length of the suction pipe is 200 m with friction factor of 0.02. What would be the minimum height of water level in the tank that must be maintained above the centerline of the pump to avoid cavitation? Pump specifications are as follows: Flow: 225 cu.m/hrHead: 20 mPower: 15 kNSuction flange and Pipe Diameter: 200 mmDischarge Flange and Pipe Diameter: 150mmNPSHa: 6.5 mNSPHr : 6marrow_forward
- A multi-stage centrifugal pump discharges 1200 gpm of water at 1400 rpm with pressurehead of 1200 ft. If the specifc speed during operation is 673 rpm, determine the number ofstages. A. 2B. 3C. 4D. 6arrow_forwardFind the specific speed of a double suction centrifugal pump delivering 1.5 m³/s against a net head of 15 m when running at 725 r.p.m. state the type of impeller to be employed for this pump.arrow_forwardIn centrifugal pump if we know the value of actual discharge is 250 l/sec , then find the value of head. Select one: O a. 1.988 m O b. 0.1988 cm O c. 19.88 m O d. 19.88 cmarrow_forward
- 2. A centrifugal pump having extermal and intemal diamcters as 750 mm and 400 mm respectively is operating at 1000 r.p.m. The vancs are curved hack at 35° to the tangent at outlet. If the velocity of flow is constant at 6 m/s, find (a) vane angle at inlet, and (b) work done per kN of water. (Ans. 16°; 123 kJ)arrow_forwardEX1: Given are the following data for a commercial centrifugal water pump: ri =10 cm, r2 = 17.5 cm, B1 =30°, B2 =20°, speed =1440 r/min. Estimate (a) the design point discharge, (b) the water horsepower, and (c) the head if b1 = b2 = 4.4 cm.(Hint, design point discharge, i.e a1=90°) %3D %3Darrow_forwardA 2-stage centrifugal pump delivers 50 gpm of 225ºF water against 200 ft head at 3200 rpm. a) What is its specific speed? b) What head could a geometrically similar pump produce if operated at 45 gpm flow?arrow_forward
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