Fox And Mcdonald's Introduction To Fluid Mechanics
9th Edition
ISBN: 9781118921876
Author: Pritchard, Philip J.; Leylegian, John C.; Bhaskaran, Rajesh
Publisher: WILEY
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Chapter 4, Problem 137P
A small lawn sprinkler is shown. The sprinkler operates at a gage pressure of 140 kPa. The total flow rate of water through the sprinkler is 4 L/min. Each jet discharges at 17 m/s (relative to the sprinkler arm) in a direction inclined 30° above the horizontal. The sprinkler rotates about a vertical axis. Friction in the bearing causes a torque of 0:18 N · m opposing rotation. Evaluate the torque required to hold the sprinkler stationary.
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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%
The impeller of a centrifugal pump has an internal
diameter of 200 mm and external diameter 400 mm. The
widths of the impeller at entry and exit are 20 mm and 10
mm respectively. The discharge of water through the
impeller is 20L/s. The impeller rotates at 1440 rpm and
the blade angle at the outlet is 30 degrees. Determine the
pressure head rise in the impeller neglecting friction
losses.
The impeller of the centrifugal pump is 350 mm diameter, and the width of the blade passages at outlet is 18 mm. A pump, which runs at 16.6 rev/s, is mounted so that its centre is 2.4 m above the water level in the suction sump. It delivers water to a point 19 m above its centre; the friction loss in the suction pipe is 68 Q² meter and that in the delivery pipe is 650 Q² meter where Q in m3/s is the rate of flow. The blades themselves occupy 5% of the circumference and are backward facing at 35° to the tangent. At inlet, the flow is radial and the radial component of velocity remains unchanged through the impeller. Assuming that 50% of the velocity head of the water leaving the impeller is converted to pressure head in the volute, and that friction and shock losses in the pump, the velocity heads in the suction and delivery pipes are negligible, calculate the following:The flow rate, m3/s, of the pump. Manometric efficiency, in %, of the pump.
Chapter 4 Solutions
Fox And Mcdonald's Introduction To Fluid Mechanics
Ch. 4 - An ice-cube tray containing 250 mL of freshwater...Ch. 4 - A hot air balloon with an initial volume of 2600...Ch. 4 - A fully loaded Boeing 777-200 jet transport...Ch. 4 - On the Milford Trek in New Zealand, there is a...Ch. 4 - A high school experiment consists of a block of...Ch. 4 - For a small particle of styrofoam (density = 19.2...Ch. 4 - Air at 20C and an absolute pressure of 101.3 kpa...Ch. 4 - A block of copper of mass 5 kg is heated to 90C...Ch. 4 - The average rate of heat loss from a person to the...Ch. 4 - The velocity field in the region shown is given by...
Ch. 4 - The area shown shaded is in a flow where the...Ch. 4 - Obtain an expression for the kinetic energy flux,...Ch. 4 - A 0.3 m by 0.5 m rectangular air duct carries a...Ch. 4 - Across a shock wave in a gas flow there is a great...Ch. 4 - Water flows in a pipeline composed of 75-mm and...Ch. 4 - The velocity distribution for laminar flow in a...Ch. 4 - A farmer is spraying a liquid through 10 nozzles,...Ch. 4 - A university laboratory that generates 15 m3/s of...Ch. 4 - Hydrogen is being pumped through a pipe system...Ch. 4 - Calculate the mean velocities for these...Ch. 4 - If the velocity profile in a passage of width 2R...Ch. 4 - Fluid with 1040 kg/m3 density is flowing steadily...Ch. 4 - A rice farmer needs to fill a 150 m 400 m field...Ch. 4 - In your kitchen, the sink is 60 cm by 45.7 cm. by...Ch. 4 - Fluid passes through this set of thin closely...Ch. 4 - A pipeline 0.3 m in diameter divides at a Y into...Ch. 4 - A manifold pipe of 3 in. diameter has four...Ch. 4 - You are trying to pump storm water out of your...Ch. 4 - In the incompressible flow through the device...Ch. 4 - Water enters a wide, flat channel of height 2h...Ch. 4 - Find the average efflux velocity V if the flow...Ch. 4 - Find V for this mushroom cap on a pipeline. 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The sprinkler...Ch. 4 - When a garden hose is used to fill a bucket, water...Ch. 4 - A pipe branches symmetrically into two legs of...Ch. 4 - Compressed air is stored in a pressure bottle with...Ch. 4 - A turbine is supplied with 0.6 m3/s of water from...Ch. 4 - Air is drawn from the atmosphere into a...Ch. 4 - At high speeds the compressor and turbine of the...Ch. 4 - Transverse thrusters are used to make large ships...Ch. 4 - All major harbors are equipped with fire boats for...Ch. 4 - A pump draws water from a reservoir through a...Ch. 4 - Liquid flowing at high speed in a wide, horizontal...
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